src/http_ana.c - haproxy - Gitiles

 /*
  * HTTP protocol analyzer
  *
  * Copyright (C) 2018 HAProxy Technologies, Christopher Faulet <cfaulet@haproxy.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  *
  */

 #include <common/base64.h>
 #include <common/config.h>
 #include <common/debug.h>
 #include <common/htx.h>
 #include <common/uri_auth.h>

 #include <types/capture.h>

 #include <proto/acl.h>
 #include <proto/action.h>
 #include <proto/channel.h>
 #include <proto/checks.h>
 #include <proto/connection.h>
 #include <proto/filters.h>
 #include <proto/http_htx.h>
 #include <proto/log.h>
 #include <proto/http_ana.h>
 #include <proto/proxy.h>
 #include <proto/server.h>
 #include <proto/stream.h>
 #include <proto/stream_interface.h>
 #include <proto/stats.h>
 #include <proto/vars.h>

 #define TRACE_SOURCE &trace_strm

 extern const char *stat_status_codes[];

 struct pool_head *pool_head_requri = NULL;
 struct pool_head *pool_head_capture = NULL;


 static void http_end_request(struct stream *s);
 static void http_end_response(struct stream *s);

 static void http_capture_headers(struct htx *htx, char **cap, struct cap_hdr *cap_hdr);
 static int http_del_hdr_value(char *start, char *end, char **from, char *next);
 static size_t http_fmt_req_line(const struct htx_sl *sl, char *str, size_t len);
 static void http_debug_stline(const char *dir, struct stream *s, const struct htx_sl *sl);
 static void http_debug_hdr(const char *dir, struct stream *s, const struct ist n, const struct ist v);

 static enum rule_result http_req_get_intercept_rule(struct proxy *px, struct list *rules, struct stream *s);
 static enum rule_result http_res_get_intercept_rule(struct proxy *px, struct list *rules, struct stream *s);

 static void http_manage_client_side_cookies(struct stream *s, struct channel *req);
 static void http_manage_server_side_cookies(struct stream *s, struct channel *res);

 static int http_stats_check_uri(struct stream *s, struct http_txn *txn, struct proxy *backend);
 static int http_handle_stats(struct stream *s, struct channel *req);

 static int http_handle_expect_hdr(struct stream *s, struct htx *htx, struct http_msg *msg);
 static int http_reply_100_continue(struct stream *s);
 static int http_reply_40x_unauthorized(struct stream *s, const char *auth_realm);

 /* This stream analyser waits for a complete HTTP request. It returns 1 if the
  * processing can continue on next analysers, or zero if it either needs more
  * data or wants to immediately abort the request (eg: timeout, error, ...). It
  * is tied to AN_REQ_WAIT_HTTP and may may remove itself from s->req.analysers
  * when it has nothing left to do, and may remove any analyser when it wants to
  * abort.
  */
 int http_wait_for_request(struct stream *s, struct channel *req, int an_bit)
 {

 	/*
 	 * We will analyze a complete HTTP request to check the its syntax.
 	 *
 	 * Once the start line and all headers are received, we may perform a
 	 * capture of the error (if any), and we will set a few fields. We also
 	 * check for monitor-uri, logging and finally headers capture.
 	 */
 	struct session *sess = s->sess;
 	struct http_txn *txn = s->txn;
 	struct http_msg *msg = &txn->req;
 	struct htx *htx;
 	struct htx_sl *sl;

 	DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);

 	htx = htxbuf(&req->buf);

 	/* Parsing errors are caught here */
 	if (htx->flags & (HTX_FL_PARSING_ERROR|HTX_FL_PROCESSING_ERROR)) {
 		stream_inc_http_req_ctr(s);
 		stream_inc_http_err_ctr(s);
 		proxy_inc_fe_req_ctr(sess->fe);
 		if (htx->flags & HTX_FL_PARSING_ERROR)
 			goto return_bad_req;
 		else
 			goto return_int_err;
 	}

 	/* we're speaking HTTP here, so let's speak HTTP to the client */
 	s->srv_error = http_return_srv_error;

 	/* If there is data available for analysis, log the end of the idle time. */
 	if (c_data(req) && s->logs.t_idle == -1) {
 		const struct cs_info *csinfo = si_get_cs_info(objt_cs(s->si[0].end));

 		s->logs.t_idle = ((csinfo)
 				  ? csinfo->t_idle
 				  : tv_ms_elapsed(&s->logs.tv_accept, &now) - s->logs.t_handshake);
 	}

 	/*
 	 * Now we quickly check if we have found a full valid request.
 	 * If not so, we check the FD and buffer states before leaving.
 	 * A full request is indicated by the fact that we have seen
 	 * the double LF/CRLF, so the state is >= HTTP_MSG_BODY. Invalid
 	 * requests are checked first. When waiting for a second request
 	 * on a keep-alive stream, if we encounter and error, close, t/o,
 	 * we note the error in the stream flags but don't set any state.
 	 * Since the error will be noted there, it will not be counted by
 	 * process_stream() as a frontend error.
 	 * Last, we may increase some tracked counters' http request errors on
 	 * the cases that are deliberately the client's fault. For instance,
 	 * a timeout or connection reset is not counted as an error. However
 	 * a bad request is.
 	 */
 	if (unlikely(htx_is_empty(htx) || htx->first == -1)) {
 		if (htx->flags & HTX_FL_UPGRADE)
 			goto failed_keep_alive;

 		/* 1: have we encountered a read error ? */
 		if (req->flags & CF_READ_ERROR) {
 			if (!(s->flags & SF_ERR_MASK))
 				s->flags |= SF_ERR_CLICL;

 			if (txn->flags & TX_WAIT_NEXT_RQ)
 				goto failed_keep_alive;

 			if (sess->fe->options & PR_O_IGNORE_PRB)
 				goto failed_keep_alive;

 			stream_inc_http_err_ctr(s);
 			stream_inc_http_req_ctr(s);
 			proxy_inc_fe_req_ctr(sess->fe);
 			_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_req, 1);
 			if (sess->listener->counters)
 				_HA_ATOMIC_ADD(&sess->listener->counters->failed_req, 1);

 			txn->status = 400;
 			http_reply_and_close(s, txn->status, NULL);
 			req->analysers &= AN_REQ_FLT_END;

 			if (!(s->flags & SF_FINST_MASK))
 				s->flags |= SF_FINST_R;
 			return 0;
 		}

 		/* 2: has the read timeout expired ? */
 		else if (req->flags & CF_READ_TIMEOUT || tick_is_expired(req->analyse_exp, now_ms)) {
 			if (!(s->flags & SF_ERR_MASK))
 				s->flags |= SF_ERR_CLITO;

 			if (txn->flags & TX_WAIT_NEXT_RQ)
 				goto failed_keep_alive;

 			if (sess->fe->options & PR_O_IGNORE_PRB)
 				goto failed_keep_alive;

 			stream_inc_http_err_ctr(s);
 			stream_inc_http_req_ctr(s);
 			proxy_inc_fe_req_ctr(sess->fe);
 			_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_req, 1);
 			if (sess->listener->counters)
 				_HA_ATOMIC_ADD(&sess->listener->counters->failed_req, 1);

 			txn->status = 408;
 			http_reply_and_close(s, txn->status, http_error_message(s));
 			req->analysers &= AN_REQ_FLT_END;

 			if (!(s->flags & SF_FINST_MASK))
 				s->flags |= SF_FINST_R;
 			return 0;
 		}

 		/* 3: have we encountered a close ? */
 		else if (req->flags & CF_SHUTR) {
 			if (!(s->flags & SF_ERR_MASK))
 				s->flags |= SF_ERR_CLICL;

 			if (txn->flags & TX_WAIT_NEXT_RQ)
 				goto failed_keep_alive;

 			if (sess->fe->options & PR_O_IGNORE_PRB)
 				goto failed_keep_alive;

 			stream_inc_http_err_ctr(s);
 			stream_inc_http_req_ctr(s);
 			proxy_inc_fe_req_ctr(sess->fe);
 			_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_req, 1);
 			if (sess->listener->counters)
 				_HA_ATOMIC_ADD(&sess->listener->counters->failed_req, 1);

 			txn->status = 400;
 			http_reply_and_close(s, txn->status, http_error_message(s));
 			req->analysers &= AN_REQ_FLT_END;

 			if (!(s->flags & SF_FINST_MASK))
 				s->flags |= SF_FINST_R;
 			return 0;
 		}

 		channel_dont_connect(req);
 		req->flags |= CF_READ_DONTWAIT; /* try to get back here ASAP */
 		s->res.flags &= ~CF_EXPECT_MORE; /* speed up sending a previous response */

 		if (sess->listener->options & LI_O_NOQUICKACK && htx_is_not_empty(htx) &&
 		    objt_conn(sess->origin) && conn_ctrl_ready(__objt_conn(sess->origin))) {
 			/* We need more data, we have to re-enable quick-ack in case we
 			 * previously disabled it, otherwise we might cause the client
 			 * to delay next data.
 			 */
 			conn_set_quickack(objt_conn(sess->origin), 1);
 		}

 		if ((req->flags & CF_READ_PARTIAL) && (txn->flags & TX_WAIT_NEXT_RQ)) {
 			/* If the client starts to talk, let's fall back to
 			 * request timeout processing.
 			 */
 			txn->flags &= ~TX_WAIT_NEXT_RQ;
 			req->analyse_exp = TICK_ETERNITY;
 		}

 		/* just set the request timeout once at the beginning of the request */
 		if (!tick_isset(req->analyse_exp)) {
 			if ((txn->flags & TX_WAIT_NEXT_RQ) && tick_isset(s->be->timeout.httpka))
 				req->analyse_exp = tick_add(now_ms, s->be->timeout.httpka);
 			else
 				req->analyse_exp = tick_add_ifset(now_ms, s->be->timeout.httpreq);
 		}

 		/* we're not ready yet */
 		DBG_TRACE_DEVEL("waiting for the request",
 				STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 		return 0;

 	failed_keep_alive:
 		/* Here we process low-level errors for keep-alive requests. In
 		 * short, if the request is not the first one and it experiences
 		 * a timeout, read error or shutdown, we just silently close so
 		 * that the client can try again.
 		 */
 		txn->status = 0;
 		msg->msg_state = HTTP_MSG_RQBEFORE;
 		req->analysers &= AN_REQ_FLT_END;
 		s->logs.logwait = 0;
 		s->logs.level = 0;
 		s->res.flags &= ~CF_EXPECT_MORE; /* speed up sending a previous response */
 		http_reply_and_close(s, txn->status, NULL);
 		DBG_TRACE_DEVEL("leaving by closing K/A connection",
 				STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 		return 0;
 	}

 	msg->msg_state = HTTP_MSG_BODY;
 	stream_inc_http_req_ctr(s);
 	proxy_inc_fe_req_ctr(sess->fe); /* one more valid request for this FE */

 	/* kill the pending keep-alive timeout */
 	txn->flags &= ~TX_WAIT_NEXT_RQ;
 	req->analyse_exp = TICK_ETERNITY;

 	BUG_ON(htx_get_first_type(htx) != HTX_BLK_REQ_SL);
 	sl = http_get_stline(htx);

 	/* 0: we might have to print this header in debug mode */
 	if (unlikely((global.mode & MODE_DEBUG) &&
 		     (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)))) {
 		int32_t pos;

 		http_debug_stline("clireq", s, sl);

 		for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
 			struct htx_blk *blk = htx_get_blk(htx, pos);
 			enum htx_blk_type type = htx_get_blk_type(blk);

 			if (type == HTX_BLK_EOH)
 				break;
 			if (type != HTX_BLK_HDR)
 				continue;

 			http_debug_hdr("clihdr", s,
 				       htx_get_blk_name(htx, blk),
 				       htx_get_blk_value(htx, blk));
 		}
 	}

 	/*
 	 * 1: identify the method and the version. Also set HTTP flags
 	 */
 	txn->meth = sl->info.req.meth;
 	if (sl->flags & HTX_SL_F_VER_11)
                 msg->flags |= HTTP_MSGF_VER_11;
 	msg->flags |= HTTP_MSGF_XFER_LEN;
 	msg->flags |= ((sl->flags & HTX_SL_F_CLEN) ? HTTP_MSGF_CNT_LEN : HTTP_MSGF_TE_CHNK);
 	if (sl->flags & HTX_SL_F_BODYLESS)
 		msg->flags |= HTTP_MSGF_BODYLESS;

 	/* we can make use of server redirect on GET and HEAD */
 	if (txn->meth == HTTP_METH_GET || txn->meth == HTTP_METH_HEAD)
 		s->flags |= SF_REDIRECTABLE;
 	else if (txn->meth == HTTP_METH_OTHER && isteqi(htx_sl_req_meth(sl), ist("PRI"))) {
 		/* PRI is reserved for the HTTP/2 preface */
 		goto return_bad_req;
 	}

 	/*
 	 * 2: check if the URI matches the monitor_uri.  We have to do this for
 	 * every request which gets in, because the monitor-uri is defined by
 	 * the frontend. If the monitor-uri starts with a '/', the matching is
 	 * done against the request's path. Otherwise, the request's uri is
 	 * used. It is a workaround to let HTTP/2 health-checks work as
 	 * expected.
 	 */
 	if (unlikely((sess->fe->monitor_uri_len != 0) &&
 		     ((*sess->fe->monitor_uri == '/' && isteq(http_get_path(htx_sl_req_uri(sl)),
 							      ist2(sess->fe->monitor_uri, sess->fe->monitor_uri_len))) ||
 		      isteq(htx_sl_req_uri(sl), ist2(sess->fe->monitor_uri, sess->fe->monitor_uri_len))))) {
 		/*
 		 * We have found the monitor URI
 		 */
 		struct acl_cond *cond;

 		s->flags |= SF_MONITOR;
 		_HA_ATOMIC_ADD(&sess->fe->fe_counters.intercepted_req, 1);

 		/* Check if we want to fail this monitor request or not */
 		list_for_each_entry(cond, &sess->fe->mon_fail_cond, list) {
 			int ret = acl_exec_cond(cond, sess->fe, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);

 			ret = acl_pass(ret);
 			if (cond->pol == ACL_COND_UNLESS)
 				ret = !ret;

 			if (ret) {
 				/* we fail this request, let's return 503 service unavail */
 				txn->status = 503;
 				if (!(s->flags & SF_ERR_MASK))
 					s->flags |= SF_ERR_LOCAL; /* we don't want a real error here */
 				goto return_prx_cond;
 			}
 		}

 		/* nothing to fail, let's reply normally */
 		txn->status = 200;
 		if (!(s->flags & SF_ERR_MASK))
 			s->flags |= SF_ERR_LOCAL; /* we don't want a real error here */
 		goto return_prx_cond;
 	}

 	/*
 	 * 3: Maybe we have to copy the original REQURI for the logs ?
 	 * Note: we cannot log anymore if the request has been
 	 * classified as invalid.
 	 */
 	if (unlikely(s->logs.logwait & LW_REQ)) {
 		/* we have a complete HTTP request that we must log */
 		if ((txn->uri = pool_alloc(pool_head_requri)) != NULL) {
 			size_t len;

 			len = http_fmt_req_line(sl, txn->uri, global.tune.requri_len - 1);
 			txn->uri[len] = 0;

 			if (!(s->logs.logwait &= ~(LW_REQ|LW_INIT)))
 				s->do_log(s);
 		} else {
 			ha_alert("HTTP logging : out of memory.\n");
 		}
 	}

 	/* if the frontend has "option http-use-proxy-header", we'll check if
 	 * we have what looks like a proxied connection instead of a connection,
 	 * and in this case set the TX_USE_PX_CONN flag to use Proxy-connection.
 	 * Note that this is *not* RFC-compliant, however browsers and proxies
 	 * happen to do that despite being non-standard :-(
 	 * We consider that a request not beginning with either '/' or '*' is
 	 * a proxied connection, which covers both "scheme://location" and
 	 * CONNECT ip:port.
 	 */
 	if ((sess->fe->options2 & PR_O2_USE_PXHDR) &&
 	    *HTX_SL_REQ_UPTR(sl) != '/' && *HTX_SL_REQ_UPTR(sl) != '*')
 		txn->flags |= TX_USE_PX_CONN;

 	/* 5: we may need to capture headers */
 	if (unlikely((s->logs.logwait & LW_REQHDR) && s->req_cap))
 		http_capture_headers(htx, s->req_cap, sess->fe->req_cap);

 	/* we may have to wait for the request's body */
 	if (s->be->options & PR_O_WREQ_BODY)
 		req->analysers |= AN_REQ_HTTP_BODY;

 	/*
 	 * RFC7234#4:
 	 *   A cache MUST write through requests with methods
 	 *   that are unsafe (Section 4.2.1 of [RFC7231]) to
 	 *   the origin server; i.e., a cache is not allowed
 	 *   to generate a reply to such a request before
 	 *   having forwarded the request and having received
 	 *   a corresponding response.
 	 *
 	 * RFC7231#4.2.1:
 	 *   Of the request methods defined by this
 	 *   specification, the GET, HEAD, OPTIONS, and TRACE
 	 *   methods are defined to be safe.
 	 */
 	if (likely(txn->meth == HTTP_METH_GET ||
 		   txn->meth == HTTP_METH_HEAD ||
 		   txn->meth == HTTP_METH_OPTIONS ||
 		   txn->meth == HTTP_METH_TRACE))
 		txn->flags |= TX_CACHEABLE | TX_CACHE_COOK;

 	/* end of job, return OK */
 	req->analysers &= ~an_bit;
 	req->analyse_exp = TICK_ETERNITY;

 	DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	return 1;

  return_int_err:
 	txn->status = 500;
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_INTERNAL;
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.internal_errors, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->internal_errors, 1);
 	goto return_prx_cond;

  return_bad_req:
 	txn->status = 400;
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_req, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->failed_req, 1);
 	/* fall through */

  return_prx_cond:
 	http_reply_and_close(s, txn->status, http_error_message(s));

 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_PRXCOND;
 	if (!(s->flags & SF_FINST_MASK))
 		s->flags |= SF_FINST_R;

 	req->analysers &= AN_REQ_FLT_END;
 	req->analyse_exp = TICK_ETERNITY;
 	DBG_TRACE_DEVEL("leaving on error",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 	return 0;
 }


 /* This stream analyser runs all HTTP request processing which is common to
  * frontends and backends, which means blocking ACLs, filters, connection-close,
  * reqadd, stats and redirects. This is performed for the designated proxy.
  * It returns 1 if the processing can continue on next analysers, or zero if it
  * either needs more data or wants to immediately abort the request (eg: deny,
  * error, ...).
  */
 int http_process_req_common(struct stream *s, struct channel *req, int an_bit, struct proxy *px)
 {
 	struct session *sess = s->sess;
 	struct http_txn *txn = s->txn;
 	struct http_msg *msg = &txn->req;
 	struct htx *htx;
 	struct redirect_rule *rule;
 	enum rule_result verdict;
 	struct connection *conn = objt_conn(sess->origin);

 	if (unlikely(msg->msg_state < HTTP_MSG_BODY)) {
 		/* we need more data */
 		goto return_prx_yield;
 	}

 	DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);

 	htx = htxbuf(&req->buf);

 	/* just in case we have some per-backend tracking. Only called the first
 	 * execution of the analyser. */
 	if (!s->current_rule || s->current_rule_list != &px->http_req_rules)
 		stream_inc_be_http_req_ctr(s);

 	/* evaluate http-request rules */
 	if (!LIST_ISEMPTY(&px->http_req_rules)) {
 		verdict = http_req_get_intercept_rule(px, &px->http_req_rules, s);

 		switch (verdict) {
 		case HTTP_RULE_RES_YIELD: /* some data miss, call the function later. */
 			goto return_prx_yield;

 		case HTTP_RULE_RES_CONT:
 		case HTTP_RULE_RES_STOP: /* nothing to do */
 			break;

 		case HTTP_RULE_RES_DENY: /* deny or tarpit */
 			if (txn->flags & TX_CLTARPIT)
 				goto tarpit;
 			goto deny;

 		case HTTP_RULE_RES_ABRT: /* abort request, response already sent. Eg: auth */
 			goto return_prx_cond;

 		case HTTP_RULE_RES_DONE: /* OK, but terminate request processing (eg: redirect) */
 			goto done;

 		case HTTP_RULE_RES_BADREQ: /* failed with a bad request */
 			goto return_bad_req;

 		case HTTP_RULE_RES_ERROR: /* failed with a bad request */
 			goto return_int_err;
 		}
 	}

 	if (conn && (conn->flags & CO_FL_EARLY_DATA) &&
 	    (conn->flags & (CO_FL_EARLY_SSL_HS | CO_FL_SSL_WAIT_HS))) {
 		struct http_hdr_ctx ctx;

 		ctx.blk = NULL;
 		if (!http_find_header(htx, ist("Early-Data"), &ctx, 0)) {
 			if (unlikely(!http_add_header(htx, ist("Early-Data"), ist("1"))))
 				goto return_int_err;
 		}
 	}

 	/* OK at this stage, we know that the request was accepted according to
 	 * the http-request rules, we can check for the stats. Note that the
 	 * URI is detected *before* the req* rules in order not to be affected
 	 * by a possible reqrep, while they are processed *after* so that a
 	 * reqdeny can still block them. This clearly needs to change in 1.6!
 	 */
 	if (!s->target && http_stats_check_uri(s, txn, px)) {
 		s->target = &http_stats_applet.obj_type;
 		if (unlikely(!si_register_handler(&s->si[1], objt_applet(s->target)))) {
 			s->logs.tv_request = now;
 			if (!(s->flags & SF_ERR_MASK))
 				s->flags |= SF_ERR_RESOURCE;
 			goto return_int_err;
 		}

 		/* parse the whole stats request and extract the relevant information */
 		http_handle_stats(s, req);
 		verdict = http_req_get_intercept_rule(px, &px->uri_auth->http_req_rules, s);
 		/* not all actions implemented: deny, allow, auth */

 		if (verdict == HTTP_RULE_RES_DENY) /* stats http-request deny */
 			goto deny;

 		if (verdict == HTTP_RULE_RES_ABRT) /* stats auth / stats http-request auth */
 			goto return_prx_cond;

 		if (verdict == HTTP_RULE_RES_BADREQ) /* failed with a bad request */
 			goto return_bad_req;

 		if (verdict == HTTP_RULE_RES_ERROR) /* failed with a bad request */
 			goto return_int_err;
 	}

 	/* Proceed with the applets now. */
 	if (unlikely(objt_applet(s->target))) {
 		if (sess->fe == s->be) /* report it if the request was intercepted by the frontend */
 			_HA_ATOMIC_ADD(&sess->fe->fe_counters.intercepted_req, 1);

 		if (http_handle_expect_hdr(s, htx, msg) == -1)
 			goto return_int_err;

 		if (!(s->flags & SF_ERR_MASK))      // this is not really an error but it is
 			s->flags |= SF_ERR_LOCAL;   // to mark that it comes from the proxy
 		if (!(s->flags & SF_FINST_MASK))
 			s->flags |= SF_FINST_R;

 		/* enable the minimally required analyzers to handle keep-alive and compression on the HTTP response */
 		req->analysers &= (AN_REQ_HTTP_BODY | AN_REQ_FLT_HTTP_HDRS | AN_REQ_FLT_END);
 		req->analysers &= ~AN_REQ_FLT_XFER_DATA;
 		req->analysers |= AN_REQ_HTTP_XFER_BODY;

 		req->flags |= CF_SEND_DONTWAIT;
 		s->flags |= SF_ASSIGNED;
 		goto done;
 	}

 	/* check whether we have some ACLs set to redirect this request */
 	list_for_each_entry(rule, &px->redirect_rules, list) {
 		if (rule->cond) {
 			int ret;

 			ret = acl_exec_cond(rule->cond, px, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
 			ret = acl_pass(ret);
 			if (rule->cond->pol == ACL_COND_UNLESS)
 				ret = !ret;
 			if (!ret)
 				continue;
 		}
 		if (!http_apply_redirect_rule(rule, s, txn))
 			goto return_int_err;
 		goto done;
 	}

 	/* POST requests may be accompanied with an "Expect: 100-Continue" header.
 	 * If this happens, then the data will not come immediately, so we must
 	 * send all what we have without waiting. Note that due to the small gain
 	 * in waiting for the body of the request, it's easier to simply put the
 	 * CF_SEND_DONTWAIT flag any time. It's a one-shot flag so it will remove
 	 * itself once used.
 	 */
 	req->flags |= CF_SEND_DONTWAIT;

  done:	/* done with this analyser, continue with next ones that the calling
 	 * points will have set, if any.
 	 */
 	req->analyse_exp = TICK_ETERNITY;
  done_without_exp: /* done with this analyser, but dont reset the analyse_exp. */
 	req->analysers &= ~an_bit;
 	DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	return 1;

  tarpit:
 	/* Allow cookie logging
 	 */
 	if (s->be->cookie_name || sess->fe->capture_name)
 		http_manage_client_side_cookies(s, req);

 	/* When a connection is tarpitted, we use the tarpit timeout,
 	 * which may be the same as the connect timeout if unspecified.
 	 * If unset, then set it to zero because we really want it to
 	 * eventually expire. We build the tarpit as an analyser.
 	 */
 	channel_htx_erase(&s->req, htx);

 	/* wipe the request out so that we can drop the connection early
 	 * if the client closes first.
 	 */
 	channel_dont_connect(req);

 	req->analysers &= AN_REQ_FLT_END; /* remove switching rules etc... */
 	req->analysers |= AN_REQ_HTTP_TARPIT;
 	req->analyse_exp = tick_add_ifset(now_ms,  s->be->timeout.tarpit);
 	if (!req->analyse_exp)
 		req->analyse_exp = tick_add(now_ms, 0);
 	stream_inc_http_err_ctr(s);
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.denied_req, 1);
 	if (s->flags & SF_BE_ASSIGNED)
 		_HA_ATOMIC_ADD(&s->be->be_counters.denied_req, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->denied_req, 1);
 	goto done_without_exp;

  deny:	/* this request was blocked (denied) */

 	/* Allow cookie logging
 	 */
 	if (s->be->cookie_name || sess->fe->capture_name)
 		http_manage_client_side_cookies(s, req);

 	s->logs.tv_request = now;
 	stream_inc_http_err_ctr(s);
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.denied_req, 1);
 	if (s->flags & SF_BE_ASSIGNED)
 		_HA_ATOMIC_ADD(&s->be->be_counters.denied_req, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->denied_req, 1);
 	goto return_prx_err;

  return_int_err:
 	txn->status = 500;
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_INTERNAL;
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.internal_errors, 1);
 	if (s->flags & SF_BE_ASSIGNED)
 		_HA_ATOMIC_ADD(&s->be->be_counters.internal_errors, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->internal_errors, 1);
 	goto return_prx_err;

  return_bad_req:
 	txn->status = 400;
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_req, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->failed_req, 1);
 	/* fall through */

  return_prx_err:
 	http_reply_and_close(s, txn->status, http_error_message(s));
 	/* fall through */

  return_prx_cond:
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_PRXCOND;
 	if (!(s->flags & SF_FINST_MASK))
 		s->flags |= SF_FINST_R;

 	req->analysers &= AN_REQ_FLT_END;
 	req->analyse_exp = TICK_ETERNITY;
 	DBG_TRACE_DEVEL("leaving on error",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 	return 0;

  return_prx_yield:
 	channel_dont_connect(req);
 	DBG_TRACE_DEVEL("waiting for more data",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	return 0;
 }

 /* This function performs all the processing enabled for the current request.
  * It returns 1 if the processing can continue on next analysers, or zero if it
  * needs more data, encounters an error, or wants to immediately abort the
  * request. It relies on buffers flags, and updates s->req.analysers.
  */
 int http_process_request(struct stream *s, struct channel *req, int an_bit)
 {
 	struct session *sess = s->sess;
 	struct http_txn *txn = s->txn;
 	struct http_msg *msg = &txn->req;
 	struct htx *htx;
 	struct connection *cli_conn = objt_conn(strm_sess(s)->origin);

 	if (unlikely(msg->msg_state < HTTP_MSG_BODY)) {
 		/* we need more data */
 		channel_dont_connect(req);
 		return 0;
 	}

 	DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);

 	/*
 	 * Right now, we know that we have processed the entire headers
 	 * and that unwanted requests have been filtered out. We can do
 	 * whatever we want with the remaining request. Also, now we
 	 * may have separate values for ->fe, ->be.
 	 */
 	htx = htxbuf(&req->buf);

 	/*
 	 * If HTTP PROXY is set we simply get remote server address parsing
 	 * incoming request.
 	 */
 	if ((s->be->options & PR_O_HTTP_PROXY) && !(s->flags & SF_ADDR_SET)) {
 		struct htx_sl *sl;
 		struct ist uri, path;

 		if (!sockaddr_alloc(&s->target_addr)) {
 			if (!(s->flags & SF_ERR_MASK))
 				s->flags |= SF_ERR_RESOURCE;
 			goto return_int_err;
 		}
 		sl = http_get_stline(htx);
 		uri = htx_sl_req_uri(sl);
 		path = http_get_path(uri);

 		if (url2sa(uri.ptr, uri.len - path.len, s->target_addr, NULL) == -1)
 			goto return_bad_req;

 		s->target = &s->be->obj_type;
 		s->flags |= SF_ADDR_SET | SF_ASSIGNED;

 		/* if the path was found, we have to remove everything between
 		 * uri.ptr and path.ptr (excluded). If it was not found, we need
 		 * to replace from all the uri by a single "/".
 		 *
 		 * Instead of rewritting the whole start line, we just update
 		 * the star-line URI. Some space will be lost but it should be
 		 * insignificant.
 		 */
 		istcpy(&uri, (path.len ? path : ist("/")), uri.len);
 	}

 	/*
 	 * 7: Now we can work with the cookies.
 	 * Note that doing so might move headers in the request, but
 	 * the fields will stay coherent and the URI will not move.
 	 * This should only be performed in the backend.
 	 */
 	if (s->be->cookie_name || sess->fe->capture_name)
 		http_manage_client_side_cookies(s, req);

 	/* add unique-id if "header-unique-id" is specified */

 	if (!LIST_ISEMPTY(&sess->fe->format_unique_id) && !s->unique_id) {
 		if ((s->unique_id = pool_alloc(pool_head_uniqueid)) == NULL) {
 			if (!(s->flags & SF_ERR_MASK))
 				s->flags |= SF_ERR_RESOURCE;
 			goto return_int_err;
 		}
 		s->unique_id[0] = '\0';
 		build_logline(s, s->unique_id, UNIQUEID_LEN, &sess->fe->format_unique_id);
 	}

 	if (sess->fe->header_unique_id && s->unique_id) {
 		struct ist n = ist2(sess->fe->header_unique_id, strlen(sess->fe->header_unique_id));
 		struct ist v = ist2(s->unique_id, strlen(s->unique_id));

 		if (unlikely(!http_add_header(htx, n, v)))
 			goto return_int_err;
 	}

 	/*
 	 * 9: add X-Forwarded-For if either the frontend or the backend
 	 * asks for it.
 	 */
 	if ((sess->fe->options | s->be->options) & PR_O_FWDFOR) {
 		struct http_hdr_ctx ctx = { .blk = NULL };
 		struct ist hdr = ist2(s->be->fwdfor_hdr_len ? s->be->fwdfor_hdr_name : sess->fe->fwdfor_hdr_name,
 				      s->be->fwdfor_hdr_len ? s->be->fwdfor_hdr_len : sess->fe->fwdfor_hdr_len);

 		if (!((sess->fe->options | s->be->options) & PR_O_FF_ALWAYS) &&
 		    http_find_header(htx, hdr, &ctx, 0)) {
 			/* The header is set to be added only if none is present
 			 * and we found it, so don't do anything.
 			 */
 		}
 		else if (cli_conn && conn_get_src(cli_conn) && cli_conn->src->ss_family == AF_INET) {
 			/* Add an X-Forwarded-For header unless the source IP is
 			 * in the 'except' network range.
 			 */
 			if ((!sess->fe->except_mask.s_addr ||
 			     (((struct sockaddr_in *)cli_conn->src)->sin_addr.s_addr & sess->fe->except_mask.s_addr)
 			     != sess->fe->except_net.s_addr) &&
 			    (!s->be->except_mask.s_addr ||
 			     (((struct sockaddr_in *)cli_conn->src)->sin_addr.s_addr & s->be->except_mask.s_addr)
 			     != s->be->except_net.s_addr)) {
 				unsigned char *pn = (unsigned char *)&((struct sockaddr_in *)cli_conn->src)->sin_addr;

 				/* Note: we rely on the backend to get the header name to be used for
 				 * x-forwarded-for, because the header is really meant for the backends.
 				 * However, if the backend did not specify any option, we have to rely
 				 * on the frontend's header name.
 				 */
 				chunk_printf(&trash, "%d.%d.%d.%d", pn[0], pn[1], pn[2], pn[3]);
 				if (unlikely(!http_add_header(htx, hdr, ist2(trash.area, trash.data))))
 					goto return_int_err;
 			}
 		}
 		else if (cli_conn && conn_get_src(cli_conn) && cli_conn->src->ss_family == AF_INET6) {
 			/* FIXME: for the sake of completeness, we should also support
 			 * 'except' here, although it is mostly useless in this case.
 			 */
 			char pn[INET6_ADDRSTRLEN];

 			inet_ntop(AF_INET6,
 				  (const void *)&((struct sockaddr_in6 *)(cli_conn->src))->sin6_addr,
 				  pn, sizeof(pn));

 			/* Note: we rely on the backend to get the header name to be used for
 			 * x-forwarded-for, because the header is really meant for the backends.
 			 * However, if the backend did not specify any option, we have to rely
 			 * on the frontend's header name.
 			 */
 			chunk_printf(&trash, "%s", pn);
 			if (unlikely(!http_add_header(htx, hdr, ist2(trash.area, trash.data))))
 				goto return_int_err;
 		}
 	}

 	/*
 	 * 10: add X-Original-To if either the frontend or the backend
 	 * asks for it.
 	 */
 	if ((sess->fe->options | s->be->options) & PR_O_ORGTO) {

 		/* FIXME: don't know if IPv6 can handle that case too. */
 		if (cli_conn && conn_get_src(cli_conn) && cli_conn->src->ss_family == AF_INET && conn_get_dst(cli_conn)) {
 			/* Add an X-Original-To header unless the destination IP is
 			 * in the 'except' network range.
 			 */
 			if (cli_conn->dst->ss_family == AF_INET &&
 			    ((!sess->fe->except_mask_to.s_addr ||
 			      (((struct sockaddr_in *)cli_conn->dst)->sin_addr.s_addr & sess->fe->except_mask_to.s_addr)
 			      != sess->fe->except_to.s_addr) &&
 			     (!s->be->except_mask_to.s_addr ||
 			      (((struct sockaddr_in *)cli_conn->dst)->sin_addr.s_addr & s->be->except_mask_to.s_addr)
 			      != s->be->except_to.s_addr))) {
 				struct ist hdr;
 				unsigned char *pn = (unsigned char *)&((struct sockaddr_in *)cli_conn->dst)->sin_addr;

 				/* Note: we rely on the backend to get the header name to be used for
 				 * x-original-to, because the header is really meant for the backends.
 				 * However, if the backend did not specify any option, we have to rely
 				 * on the frontend's header name.
 				 */
 				if (s->be->orgto_hdr_len)
 					hdr = ist2(s->be->orgto_hdr_name, s->be->orgto_hdr_len);
 				else
 					hdr = ist2(sess->fe->orgto_hdr_name, sess->fe->orgto_hdr_len);

 				chunk_printf(&trash, "%d.%d.%d.%d", pn[0], pn[1], pn[2], pn[3]);
 				if (unlikely(!http_add_header(htx, hdr, ist2(trash.area, trash.data))))
 					goto return_int_err;
 			}
 		}
 	}

 	/* If we have no server assigned yet and we're balancing on url_param
 	 * with a POST request, we may be interested in checking the body for
 	 * that parameter. This will be done in another analyser.
 	 */
 	if (!(s->flags & (SF_ASSIGNED|SF_DIRECT)) &&
 	    s->txn->meth == HTTP_METH_POST &&
 	    (s->be->lbprm.algo & BE_LB_ALGO) == BE_LB_ALGO_PH) {
 		channel_dont_connect(req);
 		req->analysers |= AN_REQ_HTTP_BODY;
 	}

 	req->analysers &= ~AN_REQ_FLT_XFER_DATA;
 	req->analysers |= AN_REQ_HTTP_XFER_BODY;

 	/* We expect some data from the client. Unless we know for sure
 	 * we already have a full request, we have to re-enable quick-ack
 	 * in case we previously disabled it, otherwise we might cause
 	 * the client to delay further data.
 	 */
 	if ((sess->listener->options & LI_O_NOQUICKACK) &&
 	    (htx_get_tail_type(htx) != HTX_BLK_EOM))
 		conn_set_quickack(cli_conn, 1);

 	/*************************************************************
 	 * OK, that's finished for the headers. We have done what we *
 	 * could. Let's switch to the DATA state.                    *
 	 ************************************************************/
 	req->analyse_exp = TICK_ETERNITY;
 	req->analysers &= ~an_bit;

 	s->logs.tv_request = now;
 	/* OK let's go on with the BODY now */
 	DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	return 1;

  return_int_err:
 	txn->status = 500;
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_INTERNAL;
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.internal_errors, 1);
 	if (s->flags & SF_BE_ASSIGNED)
 		_HA_ATOMIC_ADD(&s->be->be_counters.internal_errors, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->internal_errors, 1);
 	goto return_prx_cond;

  return_bad_req: /* let's centralize all bad requests */
 	txn->status = 400;
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_req, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->failed_req, 1);
 	/* fall through */

  return_prx_cond:
 	http_reply_and_close(s, txn->status, http_error_message(s));

 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_PRXCOND;
 	if (!(s->flags & SF_FINST_MASK))
 		s->flags |= SF_FINST_R;

 	req->analysers &= AN_REQ_FLT_END;
 	req->analyse_exp = TICK_ETERNITY;
 	DBG_TRACE_DEVEL("leaving on error",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 	return 0;
 }

 /* This function is an analyser which processes the HTTP tarpit. It always
  * returns zero, at the beginning because it prevents any other processing
  * from occurring, and at the end because it terminates the request.
  */
 int http_process_tarpit(struct stream *s, struct channel *req, int an_bit)
 {
 	struct http_txn *txn = s->txn;

 	DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, &txn->req);
 	/* This connection is being tarpitted. The CLIENT side has
 	 * already set the connect expiration date to the right
 	 * timeout. We just have to check that the client is still
 	 * there and that the timeout has not expired.
 	 */
 	channel_dont_connect(req);
 	if ((req->flags & (CF_SHUTR|CF_READ_ERROR)) == 0 &&
 	    !tick_is_expired(req->analyse_exp, now_ms)) {
 		DBG_TRACE_DEVEL("waiting for tarpit timeout expiry",
 				STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 		return 0;
 	}


 	/* We will set the queue timer to the time spent, just for
 	 * logging purposes. We fake a 500 server error, so that the
 	 * attacker will not suspect his connection has been tarpitted.
 	 * It will not cause trouble to the logs because we can exclude
 	 * the tarpitted connections by filtering on the 'PT' status flags.
 	 */
 	s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);

 	http_reply_and_close(s, txn->status, (!(req->flags & CF_READ_ERROR) ? http_error_message(s) : NULL));

 	req->analysers &= AN_REQ_FLT_END;
 	req->analyse_exp = TICK_ETERNITY;

 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_PRXCOND;
 	if (!(s->flags & SF_FINST_MASK))
 		s->flags |= SF_FINST_T;

 	DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	return 0;
 }

 /* This function is an analyser which waits for the HTTP request body. It waits
  * for either the buffer to be full, or the full advertised contents to have
  * reached the buffer. It must only be called after the standard HTTP request
  * processing has occurred, because it expects the request to be parsed and will
  * look for the Expect header. It may send a 100-Continue interim response. It
  * takes in input any state starting from HTTP_MSG_BODY and leaves with one of
  * HTTP_MSG_CHK_SIZE, HTTP_MSG_DATA or HTTP_MSG_TRAILERS. It returns zero if it
  * needs to read more data, or 1 once it has completed its analysis.
  */
 int http_wait_for_request_body(struct stream *s, struct channel *req, int an_bit)
 {
 	struct session *sess = s->sess;
 	struct http_txn *txn = s->txn;
 	struct http_msg *msg = &s->txn->req;
 	struct htx *htx;

 	DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);

 	htx = htxbuf(&req->buf);

 	if (htx->flags & HTX_FL_PARSING_ERROR)
 		goto return_bad_req;
 	if (htx->flags & HTX_FL_PROCESSING_ERROR)
 		goto return_int_err;

 	if (msg->msg_state < HTTP_MSG_BODY)
 		goto missing_data;

 	/* We have to parse the HTTP request body to find any required data.
 	 * "balance url_param check_post" should have been the only way to get
 	 * into this. We were brought here after HTTP header analysis, so all
 	 * related structures are ready.
 	 */

 	if (msg->msg_state < HTTP_MSG_DATA) {
 		if (http_handle_expect_hdr(s, htx, msg) == -1)
 			goto return_int_err;
 	}

 	msg->msg_state = HTTP_MSG_DATA;

 	/* Now we're in HTTP_MSG_DATA. We just need to know if all data have
 	 * been received or if the buffer is full.
 	 */
 	if (htx_get_tail_type(htx) > HTX_BLK_DATA ||
 	    channel_htx_full(req, htx, global.tune.maxrewrite))
 		goto http_end;

  missing_data:
 	if ((req->flags & CF_READ_TIMEOUT) || tick_is_expired(req->analyse_exp, now_ms)) {
 		txn->status = 408;
 		if (!(s->flags & SF_ERR_MASK))
 			s->flags |= SF_ERR_CLITO;
 		_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_req, 1);
 		if (sess->listener->counters)
 			_HA_ATOMIC_ADD(&sess->listener->counters->failed_req, 1);
 		goto return_prx_cond;
 	}

 	/* we get here if we need to wait for more data */
 	if (!(req->flags & (CF_SHUTR | CF_READ_ERROR))) {
 		/* Not enough data. We'll re-use the http-request
 		 * timeout here. Ideally, we should set the timeout
 		 * relative to the accept() date. We just set the
 		 * request timeout once at the beginning of the
 		 * request.
 		 */
 		channel_dont_connect(req);
 		if (!tick_isset(req->analyse_exp))
 			req->analyse_exp = tick_add_ifset(now_ms, s->be->timeout.httpreq);
 		DBG_TRACE_DEVEL("waiting for more data",
 				STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 		return 0;
 	}

  http_end:
 	/* The situation will not evolve, so let's give up on the analysis. */
 	s->logs.tv_request = now;  /* update the request timer to reflect full request */
 	req->analysers &= ~an_bit;
 	req->analyse_exp = TICK_ETERNITY;
 	DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	return 1;

  return_int_err:
 	txn->status = 500;
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_INTERNAL;
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.internal_errors, 1);
 	if (s->flags & SF_BE_ASSIGNED)
 		_HA_ATOMIC_ADD(&s->be->be_counters.internal_errors, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->internal_errors, 1);
 	goto return_prx_cond;

  return_bad_req: /* let's centralize all bad requests */
 	txn->status = 400;
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_req, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->failed_req, 1);
 	/* fall through */

  return_prx_cond:
 	http_reply_and_close(s, txn->status, http_error_message(s));

 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_PRXCOND;
 	if (!(s->flags & SF_FINST_MASK))
 		s->flags |= (msg->msg_state < HTTP_MSG_DATA ? SF_FINST_R : SF_FINST_D);

 	req->analysers &= AN_REQ_FLT_END;
 	req->analyse_exp = TICK_ETERNITY;
 	DBG_TRACE_DEVEL("leaving on error",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 	return 0;
 }

 /* This function is an analyser which forwards request body (including chunk
  * sizes if any). It is called as soon as we must forward, even if we forward
  * zero byte. The only situation where it must not be called is when we're in
  * tunnel mode and we want to forward till the close. It's used both to forward
  * remaining data and to resync after end of body. It expects the msg_state to
  * be between MSG_BODY and MSG_DONE (inclusive). It returns zero if it needs to
  * read more data, or 1 once we can go on with next request or end the stream.
  * When in MSG_DATA or MSG_TRAILERS, it will automatically forward chunk_len
  * bytes of pending data + the headers if not already done.
  */
 int http_request_forward_body(struct stream *s, struct channel *req, int an_bit)
 {
 	struct session *sess = s->sess;
 	struct http_txn *txn = s->txn;
 	struct http_msg *msg = &txn->req;
 	struct htx *htx;
 	short status = 0;
 	int ret;

 	DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);

 	htx = htxbuf(&req->buf);

 	if (htx->flags & HTX_FL_PARSING_ERROR)
 		goto return_bad_req;
 	if (htx->flags & HTX_FL_PROCESSING_ERROR)
 		goto return_int_err;

 	if ((req->flags & (CF_READ_ERROR|CF_READ_TIMEOUT|CF_WRITE_ERROR|CF_WRITE_TIMEOUT)) ||
 	    ((req->flags & CF_SHUTW) && (req->to_forward || co_data(req)))) {
 		/* Output closed while we were sending data. We must abort and
 		 * wake the other side up.
 		 */

 		/* Don't abort yet if we had L7 retries activated and it
 		 * was a write error, we may recover.
 		 */
 		if (!(req->flags & (CF_READ_ERROR | CF_READ_TIMEOUT)) &&
 		    (s->si[1].flags & SI_FL_L7_RETRY)) {
 			DBG_TRACE_DEVEL("leaving on L7 retry",
 					STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 			return 0;
 		}
 		msg->msg_state = HTTP_MSG_ERROR;
 		http_end_request(s);
 		http_end_response(s);
 		DBG_TRACE_DEVEL("leaving on error",
 				STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 		return 1;
 	}

 	/* Note that we don't have to send 100-continue back because we don't
 	 * need the data to complete our job, and it's up to the server to
 	 * decide whether to return 100, 417 or anything else in return of
 	 * an "Expect: 100-continue" header.
 	 */
 	if (msg->msg_state == HTTP_MSG_BODY)
 		msg->msg_state = HTTP_MSG_DATA;

 	/* in most states, we should abort in case of early close */
 	channel_auto_close(req);

 	if (req->to_forward) {
 		if (req->to_forward == CHN_INFINITE_FORWARD) {
 			if (req->flags & CF_EOI)
 				msg->msg_state = HTTP_MSG_ENDING;
 		}
 		else {
 			/* We can't process the buffer's contents yet */
 			req->flags |= CF_WAKE_WRITE;
 			goto missing_data_or_waiting;
 		}
 	}

 	if (msg->msg_state >= HTTP_MSG_ENDING)
 		goto ending;

 	if (txn->meth == HTTP_METH_CONNECT) {
 		msg->msg_state = HTTP_MSG_ENDING;
 		goto ending;
 	}

 	/* Forward input data. We get it by removing all outgoing data not
 	 * forwarded yet from HTX data size. If there are some data filters, we
 	 * let them decide the amount of data to forward.
 	 */
 	if (HAS_REQ_DATA_FILTERS(s)) {
 		ret  = flt_http_payload(s, msg, htx->data);
 		if (ret < 0)
 			goto return_bad_req;
 		c_adv(req, ret);
 	}
 	else {
 		c_adv(req, htx->data - co_data(req));
 		if (msg->flags & HTTP_MSGF_XFER_LEN)
 			channel_htx_forward_forever(req, htx);
 	}

 	if (htx->data != co_data(req))
 		goto missing_data_or_waiting;

 	/* Check if the end-of-message is reached and if so, switch the message
 	 * in HTTP_MSG_ENDING state. Then if all data was marked to be
 	 * forwarded, set the state to HTTP_MSG_DONE.
 	 */
 	if (htx_get_tail_type(htx) != HTX_BLK_EOM)
 		goto missing_data_or_waiting;

 	msg->msg_state = HTTP_MSG_ENDING;

   ending:
 	/* other states, ENDING...TUNNEL */
 	if (msg->msg_state >= HTTP_MSG_DONE)
 		goto done;

 	if (HAS_REQ_DATA_FILTERS(s)) {
 		ret = flt_http_end(s, msg);
 		if (ret <= 0) {
 			if (!ret)
 				goto missing_data_or_waiting;
 			goto return_bad_req;
 		}
 	}

 	if (txn->meth == HTTP_METH_CONNECT)
 		msg->msg_state = HTTP_MSG_TUNNEL;
 	else {
 		msg->msg_state = HTTP_MSG_DONE;
 		req->to_forward = 0;
 	}

   done:
 	/* we don't want to forward closes on DONE except in tunnel mode. */
 	if (!(txn->flags & TX_CON_WANT_TUN))
 		channel_dont_close(req);

 	http_end_request(s);
 	if (!(req->analysers & an_bit)) {
 		http_end_response(s);
 		if (unlikely(msg->msg_state == HTTP_MSG_ERROR)) {
 			if (req->flags & CF_SHUTW) {
 				/* request errors are most likely due to the
 				 * server aborting the transfer. */
 				goto return_srv_abort;
 			}
 			goto return_bad_req;
 		}
 		DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 		return 1;
 	}

 	/* If "option abortonclose" is set on the backend, we want to monitor
 	 * the client's connection and forward any shutdown notification to the
 	 * server, which will decide whether to close or to go on processing the
 	 * request. We only do that in tunnel mode, and not in other modes since
 	 * it can be abused to exhaust source ports. */
 	if (s->be->options & PR_O_ABRT_CLOSE) {
 		channel_auto_read(req);
 		if ((req->flags & (CF_SHUTR|CF_READ_NULL)) && !(txn->flags & TX_CON_WANT_TUN))
 			s->si[1].flags |= SI_FL_NOLINGER;
 		channel_auto_close(req);
 	}
 	else if (s->txn->meth == HTTP_METH_POST) {
 		/* POST requests may require to read extra CRLF sent by broken
 		 * browsers and which could cause an RST to be sent upon close
 		 * on some systems (eg: Linux). */
 		channel_auto_read(req);
 	}
 	DBG_TRACE_DEVEL("waiting for the end of the HTTP txn",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	return 0;

  missing_data_or_waiting:
 	/* stop waiting for data if the input is closed before the end */
 	if (msg->msg_state < HTTP_MSG_ENDING && req->flags & CF_SHUTR)
 		goto return_cli_abort;

  waiting:
 	/* waiting for the last bits to leave the buffer */
 	if (req->flags & CF_SHUTW)
 		goto return_srv_abort;

 	/* When TE: chunked is used, we need to get there again to parse remaining
 	 * chunks even if the client has closed, so we don't want to set CF_DONTCLOSE.
 	 * And when content-length is used, we never want to let the possible
 	 * shutdown be forwarded to the other side, as the state machine will
 	 * take care of it once the client responds. It's also important to
 	 * prevent TIME_WAITs from accumulating on the backend side, and for
 	 * HTTP/2 where the last frame comes with a shutdown.
 	 */
 	if (msg->flags & HTTP_MSGF_XFER_LEN)
 		channel_dont_close(req);

 	/* We know that more data are expected, but we couldn't send more that
 	 * what we did. So we always set the CF_EXPECT_MORE flag so that the
 	 * system knows it must not set a PUSH on this first part. Interactive
 	 * modes are already handled by the stream sock layer. We must not do
 	 * this in content-length mode because it could present the MSG_MORE
 	 * flag with the last block of forwarded data, which would cause an
 	 * additional delay to be observed by the receiver.
 	 */
 	if (msg->flags & HTTP_MSGF_TE_CHNK)
 		req->flags |= CF_EXPECT_MORE;

 	DBG_TRACE_DEVEL("waiting for more data to forward",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	return 0;

   return_cli_abort:
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.cli_aborts, 1);
 	_HA_ATOMIC_ADD(&s->be->be_counters.cli_aborts, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->cli_aborts, 1);
 	if (objt_server(s->target))
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.cli_aborts, 1);
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_CLICL;
 	status = 400;
 	goto return_prx_cond;

   return_srv_abort:
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.srv_aborts, 1);
 	_HA_ATOMIC_ADD(&s->be->be_counters.srv_aborts, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->srv_aborts, 1);
 	if (objt_server(s->target))
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.srv_aborts, 1);
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_SRVCL;
 	status = 502;
 	goto return_prx_cond;

   return_int_err:
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_INTERNAL;
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.internal_errors, 1);
 	_HA_ATOMIC_ADD(&s->be->be_counters.internal_errors, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->internal_errors, 1);
 	if (objt_server(s->target))
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.internal_errors, 1);
 	status = 500;
 	goto return_prx_cond;

   return_bad_req:
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.failed_req, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->failed_req, 1);
 	status = 400;
 	/* fall through */

   return_prx_cond:
 	if (txn->status > 0) {
 		/* Note: we don't send any error if some data were already sent */
 		http_reply_and_close(s, txn->status, NULL);
 	} else {
 		txn->status = status;
 		http_reply_and_close(s, txn->status, http_error_message(s));
 	}
 	req->analysers   &= AN_REQ_FLT_END;
 	s->res.analysers &= AN_RES_FLT_END; /* we're in data phase, we want to abort both directions */
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_PRXCOND;
 	if (!(s->flags & SF_FINST_MASK))
 		s->flags |= ((txn->rsp.msg_state < HTTP_MSG_ERROR) ? SF_FINST_H : SF_FINST_D);
 	DBG_TRACE_DEVEL("leaving on error ",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 	return 0;
 }

 /* Reset the stream and the backend stream_interface to a situation suitable for attemption connection */
 /* Returns 0 if we can attempt to retry, -1 otherwise */
 static __inline int do_l7_retry(struct stream *s, struct stream_interface *si)
 {
 	struct channel *req, *res;
 	int co_data;

 	si->conn_retries--;
 	if (si->conn_retries < 0)
 		return -1;

 	if (objt_server(s->target))
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.retries, 1);
 	_HA_ATOMIC_ADD(&s->be->be_counters.retries, 1);

 	req = &s->req;
 	res = &s->res;
 	/* Remove any write error from the request, and read error from the response */
 	req->flags &= ~(CF_WRITE_ERROR | CF_WRITE_TIMEOUT | CF_SHUTW | CF_SHUTW_NOW);
 	res->flags &= ~(CF_READ_ERROR | CF_READ_TIMEOUT | CF_SHUTR | CF_EOI | CF_READ_NULL | CF_SHUTR_NOW);
 	res->analysers = 0;
 	si->flags &= ~(SI_FL_ERR | SI_FL_EXP | SI_FL_RXBLK_SHUT);
 	stream_choose_redispatch(s);
 	si->exp = TICK_ETERNITY;
 	res->rex = TICK_ETERNITY;
 	res->to_forward = 0;
 	res->analyse_exp = TICK_ETERNITY;
 	res->total = 0;
 	s->flags &= ~(SF_ERR_SRVTO | SF_ERR_SRVCL);
 	si_release_endpoint(&s->si[1]);
 	b_free(&req->buf);
 	/* Swap the L7 buffer with the channel buffer */
 	/* We know we stored the co_data as b_data, so get it there */
 	co_data = b_data(&si->l7_buffer);
 	b_set_data(&si->l7_buffer, b_size(&si->l7_buffer));
 	b_xfer(&req->buf, &si->l7_buffer, b_data(&si->l7_buffer));

 	co_set_data(req, co_data);
 	b_reset(&res->buf);
 	co_set_data(res, 0);
 	return 0;
 }

 /* This stream analyser waits for a complete HTTP response. It returns 1 if the
  * processing can continue on next analysers, or zero if it either needs more
  * data or wants to immediately abort the response (eg: timeout, error, ...). It
  * is tied to AN_RES_WAIT_HTTP and may may remove itself from s->res.analysers
  * when it has nothing left to do, and may remove any analyser when it wants to
  * abort.
  */
 int http_wait_for_response(struct stream *s, struct channel *rep, int an_bit)
 {
 	/*
 	 * We will analyze a complete HTTP response to check the its syntax.
 	 *
 	 * Once the start line and all headers are received, we may perform a
 	 * capture of the error (if any), and we will set a few fields. We also
 	 * logging and finally headers capture.
 	 */
 	struct session *sess = s->sess;
 	struct http_txn *txn = s->txn;
 	struct http_msg *msg = &txn->rsp;
 	struct htx *htx;
 	struct stream_interface *si_b = &s->si[1];
 	struct connection *srv_conn;
 	struct htx_sl *sl;
 	int n;

 	DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);

 	htx = htxbuf(&rep->buf);

 	/* Parsing errors are caught here */
 	if (htx->flags & HTX_FL_PARSING_ERROR)
 		goto return_bad_res;
 	if (htx->flags & HTX_FL_PROCESSING_ERROR)
 		goto return_int_err;

 	/*
 	 * Now we quickly check if we have found a full valid response.
 	 * If not so, we check the FD and buffer states before leaving.
 	 * A full response is indicated by the fact that we have seen
 	 * the double LF/CRLF, so the state is >= HTTP_MSG_BODY. Invalid
 	 * responses are checked first.
 	 *
 	 * Depending on whether the client is still there or not, we
 	 * may send an error response back or not. Note that normally
 	 * we should only check for HTTP status there, and check I/O
 	 * errors somewhere else.
 	 */
   next_one:
 	if (unlikely(htx_is_empty(htx) || htx->first == -1)) {
 		/* 1: have we encountered a read error ? */
 		if (rep->flags & CF_READ_ERROR) {
 			struct connection *conn = NULL;

 			if (objt_cs(s->si[1].end))
 				conn = objt_cs(s->si[1].end)->conn;

 			if (si_b->flags & SI_FL_L7_RETRY &&
 			    (!conn || conn->err_code != CO_ER_SSL_EARLY_FAILED)) {
 				/* If we arrive here, then CF_READ_ERROR was
 				 * set by si_cs_recv() because we matched a
 				 * status, overwise it would have removed
 				 * the SI_FL_L7_RETRY flag, so it's ok not
 				 * to check s->be->retry_type.
 				 */
 				if (co_data(rep) || do_l7_retry(s, si_b) == 0)
 					return 0;
 			}

 			if (txn->flags & TX_NOT_FIRST)
 				goto abort_keep_alive;

 			_HA_ATOMIC_ADD(&s->be->be_counters.failed_resp, 1);
 			if (objt_server(s->target)) {
 				_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.failed_resp, 1);
 				health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_READ_ERROR);
 			}

 			rep->analysers &= AN_RES_FLT_END;
 			txn->status = 502;

 			/* Check to see if the server refused the early data.
 			 * If so, just send a 425
 			 */
 			if (conn->err_code == CO_ER_SSL_EARLY_FAILED) {
 				if ((s->be->retry_type & PR_RE_EARLY_ERROR) &&
 				    (si_b->flags & SI_FL_L7_RETRY) &&
 				    do_l7_retry(s, si_b) == 0) {
 					DBG_TRACE_DEVEL("leaving on L7 retry",
 							STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 					return 0;
 				}
 				txn->status = 425;
 			}

 			s->si[1].flags |= SI_FL_NOLINGER;
 			http_reply_and_close(s, txn->status, http_error_message(s));

 			if (!(s->flags & SF_ERR_MASK))
 				s->flags |= SF_ERR_SRVCL;
 			if (!(s->flags & SF_FINST_MASK))
 				s->flags |= SF_FINST_H;
 			DBG_TRACE_DEVEL("leaving on error",
 					STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 			return 0;
 		}

 		/* 2: read timeout : return a 504 to the client. */
 		else if (rep->flags & CF_READ_TIMEOUT) {
 			if ((si_b->flags & SI_FL_L7_RETRY) &&
 			    (s->be->retry_type & PR_RE_TIMEOUT)) {
 				if (co_data(rep) || do_l7_retry(s, si_b) == 0) {
 					DBG_TRACE_DEVEL("leaving on L7 retry",
 							STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 					return 0;
 				}
 			}
 			_HA_ATOMIC_ADD(&s->be->be_counters.failed_resp, 1);
 			if (objt_server(s->target)) {
 				_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.failed_resp, 1);
 				health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_READ_TIMEOUT);
 			}

 			rep->analysers &= AN_RES_FLT_END;
 			txn->status = 504;
 			s->si[1].flags |= SI_FL_NOLINGER;
 			http_reply_and_close(s, txn->status, http_error_message(s));

 			if (!(s->flags & SF_ERR_MASK))
 				s->flags |= SF_ERR_SRVTO;
 			if (!(s->flags & SF_FINST_MASK))
 				s->flags |= SF_FINST_H;
 			DBG_TRACE_DEVEL("leaving on error",
 					STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 			return 0;
 		}

 		/* 3: client abort with an abortonclose */
 		else if ((rep->flags & CF_SHUTR) && ((s->req.flags & (CF_SHUTR|CF_SHUTW)) == (CF_SHUTR|CF_SHUTW))) {
 			_HA_ATOMIC_ADD(&sess->fe->fe_counters.cli_aborts, 1);
 			_HA_ATOMIC_ADD(&s->be->be_counters.cli_aborts, 1);
 			if (sess->listener->counters)
 				_HA_ATOMIC_ADD(&sess->listener->counters->cli_aborts, 1);
 			if (objt_server(s->target))
 				_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.cli_aborts, 1);

 			rep->analysers &= AN_RES_FLT_END;
 			txn->status = 400;
 			http_reply_and_close(s, txn->status, http_error_message(s));

 			if (!(s->flags & SF_ERR_MASK))
 				s->flags |= SF_ERR_CLICL;
 			if (!(s->flags & SF_FINST_MASK))
 				s->flags |= SF_FINST_H;

 			/* process_stream() will take care of the error */
 			DBG_TRACE_DEVEL("leaving on error",
 					STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 			return 0;
 		}

 		/* 4: close from server, capture the response if the server has started to respond */
 		else if (rep->flags & CF_SHUTR) {
 			if ((si_b->flags & SI_FL_L7_RETRY) &&
 			    (s->be->retry_type & PR_RE_DISCONNECTED)) {
 				if (co_data(rep) || do_l7_retry(s, si_b) == 0) {
 					DBG_TRACE_DEVEL("leaving on L7 retry",
 							STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 					return 0;
 				}
 			}

 			if (txn->flags & TX_NOT_FIRST)
 				goto abort_keep_alive;

 			_HA_ATOMIC_ADD(&s->be->be_counters.failed_resp, 1);
 			if (objt_server(s->target)) {
 				_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.failed_resp, 1);
 				health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_BROKEN_PIPE);
 			}

 			rep->analysers &= AN_RES_FLT_END;
 			txn->status = 502;
 			s->si[1].flags |= SI_FL_NOLINGER;
 			http_reply_and_close(s, txn->status, http_error_message(s));

 			if (!(s->flags & SF_ERR_MASK))
 				s->flags |= SF_ERR_SRVCL;
 			if (!(s->flags & SF_FINST_MASK))
 				s->flags |= SF_FINST_H;
 			DBG_TRACE_DEVEL("leaving on error",
 					STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 			return 0;
 		}

 		/* 5: write error to client (we don't send any message then) */
 		else if (rep->flags & CF_WRITE_ERROR) {
 			if (txn->flags & TX_NOT_FIRST)
 				goto abort_keep_alive;

 			_HA_ATOMIC_ADD(&s->be->be_counters.failed_resp, 1);
 			if (objt_server(s->target))
 				_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.failed_resp, 1);
 			rep->analysers &= AN_RES_FLT_END;

 			if (!(s->flags & SF_ERR_MASK))
 				s->flags |= SF_ERR_CLICL;
 			if (!(s->flags & SF_FINST_MASK))
 				s->flags |= SF_FINST_H;

 			/* process_stream() will take care of the error */
 			DBG_TRACE_DEVEL("leaving on error",
 					STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 			return 0;
 		}

 		channel_dont_close(rep);
 		rep->flags |= CF_READ_DONTWAIT; /* try to get back here ASAP */
 		DBG_TRACE_DEVEL("waiting for more data",
 				STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 		return 0;
 	}

 	/* More interesting part now : we know that we have a complete
 	 * response which at least looks like HTTP. We have an indicator
 	 * of each header's length, so we can parse them quickly.
 	 */
 	msg->msg_state = HTTP_MSG_BODY;
 	BUG_ON(htx_get_first_type(htx) != HTX_BLK_RES_SL);
 	sl = http_get_stline(htx);

 	/* 0: we might have to print this header in debug mode */
 	if (unlikely((global.mode & MODE_DEBUG) &&
 		     (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)))) {
 		int32_t pos;

 		http_debug_stline("srvrep", s, sl);

 		for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
 			struct htx_blk *blk = htx_get_blk(htx, pos);
 			enum htx_blk_type type = htx_get_blk_type(blk);

 			if (type == HTX_BLK_EOH)
 				break;
 			if (type != HTX_BLK_HDR)
 				continue;

 			http_debug_hdr("srvhdr", s,
 				       htx_get_blk_name(htx, blk),
 				       htx_get_blk_value(htx, blk));
 		}
 	}

 	/* 1: get the status code and the version. Also set HTTP flags */
 	txn->status = sl->info.res.status;
 	if (sl->flags & HTX_SL_F_VER_11)
                 msg->flags |= HTTP_MSGF_VER_11;
 	if (sl->flags & HTX_SL_F_XFER_LEN) {
 		msg->flags |= HTTP_MSGF_XFER_LEN;
 		msg->flags |= ((sl->flags & HTX_SL_F_CLEN) ? HTTP_MSGF_CNT_LEN : HTTP_MSGF_TE_CHNK);
 		if (sl->flags & HTX_SL_F_BODYLESS)
 			msg->flags |= HTTP_MSGF_BODYLESS;
 	}

 	n = txn->status / 100;
 	if (n < 1 || n > 5)
 		n = 0;

 	/* when the client triggers a 4xx from the server, it's most often due
 	 * to a missing object or permission. These events should be tracked
 	 * because if they happen often, it may indicate a brute force or a
 	 * vulnerability scan.
 	 */
 	if (n == 4)
 		stream_inc_http_err_ctr(s);

 	if (objt_server(s->target))
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.p.http.rsp[n], 1);

 	/* Adjust server's health based on status code. Note: status codes 501
 	 * and 505 are triggered on demand by client request, so we must not
 	 * count them as server failures.
 	 */
 	if (objt_server(s->target)) {
 		if (txn->status >= 100 && (txn->status < 500 || txn->status == 501 || txn->status == 505))
 			health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_OK);
 		else
 			health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_STS);
 	}

 	/*
 	 * We may be facing a 100-continue response, or any other informational
 	 * 1xx response which is non-final, in which case this is not the right
 	 * response, and we're waiting for the next one. Let's allow this response
 	 * to go to the client and wait for the next one. There's an exception for
 	 * 101 which is used later in the code to switch protocols.
 	 */
 	if (txn->status < 200 &&
 	    (txn->status == 100 || txn->status >= 102)) {
 		FLT_STRM_CB(s, flt_http_reset(s, msg));
 		htx->first = channel_htx_fwd_headers(rep, htx);
 		msg->msg_state = HTTP_MSG_RPBEFORE;
 		msg->flags = 0;
 		txn->status = 0;
 		s->logs.t_data = -1; /* was not a response yet */
 		goto next_one;
 	}

 	/*
 	 * 2: check for cacheability.
 	 */

 	switch (txn->status) {
 	case 200:
 	case 203:
 	case 204:
 	case 206:
 	case 300:
 	case 301:
 	case 404:
 	case 405:
 	case 410:
 	case 414:
 	case 501:
 		break;
 	default:
 		/* RFC7231#6.1:
 		 *   Responses with status codes that are defined as
 		 *   cacheable by default (e.g., 200, 203, 204, 206,
 		 *   300, 301, 404, 405, 410, 414, and 501 in this
 		 *   specification) can be reused by a cache with
 		 *   heuristic expiration unless otherwise indicated
 		 *   by the method definition or explicit cache
 		 *   controls [RFC7234]; all other status codes are
 		 *   not cacheable by default.
 		 */
 		txn->flags &= ~(TX_CACHEABLE | TX_CACHE_COOK);
 		break;
 	}

 	/*
 	 * 3: we may need to capture headers
 	 */
 	s->logs.logwait &= ~LW_RESP;
 	if (unlikely((s->logs.logwait & LW_RSPHDR) && s->res_cap))
 		http_capture_headers(htx, s->res_cap, sess->fe->rsp_cap);

 	/* Skip parsing if no content length is possible. */
 	if (unlikely((txn->meth == HTTP_METH_CONNECT && txn->status == 200) ||
 		     txn->status == 101)) {
 		/* Either we've established an explicit tunnel, or we're
 		 * switching the protocol. In both cases, we're very unlikely
 		 * to understand the next protocols. We have to switch to tunnel
 		 * mode, so that we transfer the request and responses then let
 		 * this protocol pass unmodified. When we later implement specific
 		 * parsers for such protocols, we'll want to check the Upgrade
 		 * header which contains information about that protocol for
 		 * responses with status 101 (eg: see RFC2817 about TLS).
 		 */
 		txn->flags |= TX_CON_WANT_TUN;
 	}

 	/* check for NTML authentication headers in 401 (WWW-Authenticate) and
 	 * 407 (Proxy-Authenticate) responses and set the connection to private
 	 */
 	srv_conn = cs_conn(objt_cs(s->si[1].end));
 	if (srv_conn) {
 		struct ist hdr;
 		struct http_hdr_ctx ctx;

 		if (txn->status == 401)
 			hdr = ist("WWW-Authenticate");
 		else if (txn->status == 407)
 			hdr = ist("Proxy-Authenticate");
 		else
 			goto end;

 		ctx.blk = NULL;
 		while (http_find_header(htx, hdr, &ctx, 0)) {
 			if ((ctx.value.len >= 9 && word_match(ctx.value.ptr, ctx.value.len, "Negotiate", 9)) ||
 			    (ctx.value.len >= 4 && word_match(ctx.value.ptr, ctx.value.len, "NTLM", 4))) {
 				sess->flags |= SESS_FL_PREFER_LAST;
 				srv_conn->flags |= CO_FL_PRIVATE;
 			}
 		}
 	}

   end:
 	/* we want to have the response time before we start processing it */
 	s->logs.t_data = tv_ms_elapsed(&s->logs.tv_accept, &now);

 	/* end of job, return OK */
 	rep->analysers &= ~an_bit;
 	rep->analyse_exp = TICK_ETERNITY;
 	channel_auto_close(rep);
 	DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	return 1;

  return_int_err:
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.internal_errors, 1);
 	_HA_ATOMIC_ADD(&s->be->be_counters.internal_errors, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->internal_errors, 1);
 	if (objt_server(s->target))
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.internal_errors, 1);
 	txn->status = 500;
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_INTERNAL;
 	goto return_prx_cond;

   return_bad_res:
 	_HA_ATOMIC_ADD(&s->be->be_counters.failed_resp, 1);
 	if (objt_server(s->target)) {
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.failed_resp, 1);
 		health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_HDRRSP);
 	}
 	if ((s->be->retry_type & PR_RE_JUNK_REQUEST) &&
 	    (si_b->flags & SI_FL_L7_RETRY) &&
 	    do_l7_retry(s, si_b) == 0) {
 		DBG_TRACE_DEVEL("leaving on L7 retry",
 				STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 		return 0;
 	}
 	txn->status = 502;
 	/* fall through */

  return_prx_cond:
 	http_reply_and_close(s, txn->status, http_error_message(s));

 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_PRXCOND;
 	if (!(s->flags & SF_FINST_MASK))
 		s->flags |= SF_FINST_H;

 	s->si[1].flags |= SI_FL_NOLINGER;
 	rep->analysers &= AN_RES_FLT_END;
 	rep->analyse_exp = TICK_ETERNITY;
 	DBG_TRACE_DEVEL("leaving on error",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 	return 0;

  abort_keep_alive:
 	/* A keep-alive request to the server failed on a network error.
 	 * The client is required to retry. We need to close without returning
 	 * any other information so that the client retries.
 	 */
 	txn->status = 0;
 	rep->analysers   &= AN_RES_FLT_END;
 	s->req.analysers &= AN_REQ_FLT_END;
 	s->logs.logwait = 0;
 	s->logs.level = 0;
 	s->res.flags &= ~CF_EXPECT_MORE; /* speed up sending a previous response */
 	http_reply_and_close(s, txn->status, NULL);
 	DBG_TRACE_DEVEL("leaving by closing K/A connection",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	return 0;
 }

 /* This function performs all the processing enabled for the current response.
  * It normally returns 1 unless it wants to break. It relies on buffers flags,
  * and updates s->res.analysers. It might make sense to explode it into several
  * other functions. It works like process_request (see indications above).
  */
 int http_process_res_common(struct stream *s, struct channel *rep, int an_bit, struct proxy *px)
 {
 	struct session *sess = s->sess;
 	struct http_txn *txn = s->txn;
 	struct http_msg *msg = &txn->rsp;
 	struct htx *htx;
 	struct proxy *cur_proxy;
 	enum rule_result ret = HTTP_RULE_RES_CONT;

 	if (unlikely(msg->msg_state < HTTP_MSG_BODY))	/* we need more data */
 		return 0;

 	DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);

 	htx = htxbuf(&rep->buf);

 	/* The stats applet needs to adjust the Connection header but we don't
 	 * apply any filter there.
 	 */
 	if (unlikely(objt_applet(s->target) == &http_stats_applet)) {
 		rep->analysers &= ~an_bit;
 		rep->analyse_exp = TICK_ETERNITY;
 		goto end;
 	}

 	/*
 	 * We will have to evaluate the filters.
 	 * As opposed to version 1.2, now they will be evaluated in the
 	 * filters order and not in the header order. This means that
 	 * each filter has to be validated among all headers.
 	 *
 	 * Filters are tried with ->be first, then with ->fe if it is
 	 * different from ->be.
 	 *
 	 * Maybe we are in resume condiion. In this case I choose the
 	 * "struct proxy" which contains the rule list matching the resume
 	 * pointer. If none of theses "struct proxy" match, I initialise
 	 * the process with the first one.
 	 *
 	 * In fact, I check only correspondance betwwen the current list
 	 * pointer and the ->fe rule list. If it doesn't match, I initialize
 	 * the loop with the ->be.
 	 */
 	if (s->current_rule_list == &sess->fe->http_res_rules)
 		cur_proxy = sess->fe;
 	else
 		cur_proxy = s->be;
 	while (1) {
 		/* evaluate http-response rules */
 		if (ret == HTTP_RULE_RES_CONT) {
 			ret = http_res_get_intercept_rule(cur_proxy, &cur_proxy->http_res_rules, s);

 			switch (ret) {
 			case HTTP_RULE_RES_YIELD: /* some data miss, call the function later. */
 				goto return_prx_yield;

 			case HTTP_RULE_RES_CONT:
 			case HTTP_RULE_RES_STOP: /* nothing to do */
 				break;

 			case HTTP_RULE_RES_DENY: /* deny or tarpit */
 				goto deny;

 			case HTTP_RULE_RES_ABRT: /* abort request, response already sent */
 				goto return_prx_cond;

 			case HTTP_RULE_RES_DONE: /* OK, but terminate request processing (eg: redirect) */
 				goto done;

 			case HTTP_RULE_RES_BADREQ: /* failed with a bad request */
 				goto return_bad_res;

 			case HTTP_RULE_RES_ERROR: /* failed with a bad request */
 				goto return_int_err;
 			}

 		}

 		/* check whether we're already working on the frontend */
 		if (cur_proxy == sess->fe)
 			break;
 		cur_proxy = sess->fe;
 	}

 	/* OK that's all we can do for 1xx responses */
 	if (unlikely(txn->status < 200 && txn->status != 101))
 		goto end;

 	/*
 	 * Now check for a server cookie.
 	 */
 	if (s->be->cookie_name || sess->fe->capture_name || (s->be->options & PR_O_CHK_CACHE))
 		http_manage_server_side_cookies(s, rep);

 	/*
 	 * Check for cache-control or pragma headers if required.
 	 */
 	if ((s->be->options & PR_O_CHK_CACHE) || (s->be->ck_opts & PR_CK_NOC))
 		http_check_response_for_cacheability(s, rep);

 	/*
 	 * Add server cookie in the response if needed
 	 */
 	if (objt_server(s->target) && (s->be->ck_opts & PR_CK_INS) &&
 	    !((txn->flags & TX_SCK_FOUND) && (s->be->ck_opts & PR_CK_PSV)) &&
 	    (!(s->flags & SF_DIRECT) ||
 	     ((s->be->cookie_maxidle || txn->cookie_last_date) &&
 	      (!txn->cookie_last_date || (txn->cookie_last_date - date.tv_sec) < 0)) ||
 	     (s->be->cookie_maxlife && !txn->cookie_first_date) ||  // set the first_date
 	     (!s->be->cookie_maxlife && txn->cookie_first_date)) && // remove the first_date
 	    (!(s->be->ck_opts & PR_CK_POST) || (txn->meth == HTTP_METH_POST)) &&
 	    !(s->flags & SF_IGNORE_PRST)) {
 		/* the server is known, it's not the one the client requested, or the
 		 * cookie's last seen date needs to be refreshed. We have to
 		 * insert a set-cookie here, except if we want to insert only on POST
 		 * requests and this one isn't. Note that servers which don't have cookies
 		 * (eg: some backup servers) will return a full cookie removal request.
 		 */
 		if (!objt_server(s->target)->cookie) {
 			chunk_printf(&trash,
 				     "%s=; Expires=Thu, 01-Jan-1970 00:00:01 GMT; path=/",
 				     s->be->cookie_name);
 		}
 		else {
 			chunk_printf(&trash, "%s=%s", s->be->cookie_name, objt_server(s->target)->cookie);

 			if (s->be->cookie_maxidle || s->be->cookie_maxlife) {
 				/* emit last_date, which is mandatory */
 				trash.area[trash.data++] = COOKIE_DELIM_DATE;
 				s30tob64((date.tv_sec+3) >> 2,
 					 trash.area + trash.data);
 				trash.data += 5;

 				if (s->be->cookie_maxlife) {
 					/* emit first_date, which is either the original one or
 					 * the current date.
 					 */
 					trash.area[trash.data++] = COOKIE_DELIM_DATE;
 					s30tob64(txn->cookie_first_date ?
 						 txn->cookie_first_date >> 2 :
 						 (date.tv_sec+3) >> 2,
 						 trash.area + trash.data);
 					trash.data += 5;
 				}
 			}
 			chunk_appendf(&trash, "; path=/");
 		}

 		if (s->be->cookie_domain)
 			chunk_appendf(&trash, "; domain=%s", s->be->cookie_domain);

 		if (s->be->ck_opts & PR_CK_HTTPONLY)
 			chunk_appendf(&trash, "; HttpOnly");

 		if (s->be->ck_opts & PR_CK_SECURE)
 			chunk_appendf(&trash, "; Secure");

 		if (s->be->cookie_attrs)
 			chunk_appendf(&trash, "; %s", s->be->cookie_attrs);

 		if (unlikely(!http_add_header(htx, ist("Set-Cookie"), ist2(trash.area, trash.data))))
 			goto return_int_err;

 		txn->flags &= ~TX_SCK_MASK;
 		if (__objt_server(s->target)->cookie && (s->flags & SF_DIRECT))
 			/* the server did not change, only the date was updated */
 			txn->flags |= TX_SCK_UPDATED;
 		else
 			txn->flags |= TX_SCK_INSERTED;

 		/* Here, we will tell an eventual cache on the client side that we don't
 		 * want it to cache this reply because HTTP/1.0 caches also cache cookies !
 		 * Some caches understand the correct form: 'no-cache="set-cookie"', but
 		 * others don't (eg: apache <= 1.3.26). So we use 'private' instead.
 		 */
 		if ((s->be->ck_opts & PR_CK_NOC) && (txn->flags & TX_CACHEABLE)) {

 			txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;

 			if (unlikely(!http_add_header(htx, ist("Cache-control"), ist("private"))))
 				goto return_int_err;
 		}
 	}

 	/*
 	 * Check if result will be cacheable with a cookie.
 	 * We'll block the response if security checks have caught
 	 * nasty things such as a cacheable cookie.
 	 */
 	if (((txn->flags & (TX_CACHEABLE | TX_CACHE_COOK | TX_SCK_PRESENT)) ==
 	     (TX_CACHEABLE | TX_CACHE_COOK | TX_SCK_PRESENT)) &&
 	    (s->be->options & PR_O_CHK_CACHE)) {
 		/* we're in presence of a cacheable response containing
 		 * a set-cookie header. We'll block it as requested by
 		 * the 'checkcache' option, and send an alert.
 		 */
 		ha_alert("Blocking cacheable cookie in response from instance %s, server %s.\n",
 			 s->be->id, objt_server(s->target) ? objt_server(s->target)->id : "<dispatch>");
 		send_log(s->be, LOG_ALERT,
 			 "Blocking cacheable cookie in response from instance %s, server %s.\n",
 			 s->be->id, objt_server(s->target) ? objt_server(s->target)->id : "<dispatch>");
 		goto deny;
 	}

   end:
 	/*
 	 * Evaluate after-response rules before forwarding the response. rules
 	 * from the backend are evaluated first, then one from the frontend if
 	 * it differs.
 	 */
 	if (!http_eval_after_res_rules(s))
 		goto return_int_err;

 	/* Always enter in the body analyzer */
 	rep->analysers &= ~AN_RES_FLT_XFER_DATA;
 	rep->analysers |= AN_RES_HTTP_XFER_BODY;

 	/* if the user wants to log as soon as possible, without counting
 	 * bytes from the server, then this is the right moment. We have
 	 * to temporarily assign bytes_out to log what we currently have.
 	 */
 	if (!LIST_ISEMPTY(&sess->fe->logformat) && !(s->logs.logwait & LW_BYTES)) {
 		s->logs.t_close = s->logs.t_data; /* to get a valid end date */
 		s->logs.bytes_out = htx->data;
 		s->do_log(s);
 		s->logs.bytes_out = 0;
 	}

  done:
 	DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	rep->analysers &= ~an_bit;
 	rep->analyse_exp = TICK_ETERNITY;
 	return 1;

  deny:
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.denied_resp, 1);
 	_HA_ATOMIC_ADD(&s->be->be_counters.denied_resp, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->denied_resp, 1);
 	if (objt_server(s->target))
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.denied_resp, 1);
 	goto return_prx_err;

  return_int_err:
 	txn->status = 500;
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_INTERNAL;
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.internal_errors, 1);
 	_HA_ATOMIC_ADD(&s->be->be_counters.internal_errors, 1);
 	if (objt_server(s->target))
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.internal_errors, 1);
 	if (objt_server(s->target))
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.internal_errors, 1);
 	goto return_prx_err;

  return_bad_res:
 	txn->status = 502;
 	_HA_ATOMIC_ADD(&s->be->be_counters.failed_resp, 1);
 	if (objt_server(s->target)) {
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.failed_resp, 1);
 		health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_RSP);
 	}
 	/* fall through */

  return_prx_err:
 	http_reply_and_close(s, txn->status, http_error_message(s));
 	/* fall through */

  return_prx_cond:
 	s->logs.t_data = -1; /* was not a valid response */
 	s->si[1].flags |= SI_FL_NOLINGER;

 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_PRXCOND;
 	if (!(s->flags & SF_FINST_MASK))
 		s->flags |= SF_FINST_H;

 	rep->analysers &= ~an_bit;
 	rep->analyse_exp = TICK_ETERNITY;
 	DBG_TRACE_DEVEL("leaving on error",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 	return 0;

  return_prx_yield:
 	channel_dont_close(rep);
 	DBG_TRACE_DEVEL("waiting for more data",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	return 0;
 }

 /* This function is an analyser which forwards response body (including chunk
  * sizes if any). It is called as soon as we must forward, even if we forward
  * zero byte. The only situation where it must not be called is when we're in
  * tunnel mode and we want to forward till the close. It's used both to forward
  * remaining data and to resync after end of body. It expects the msg_state to
  * be between MSG_BODY and MSG_DONE (inclusive). It returns zero if it needs to
  * read more data, or 1 once we can go on with next request or end the stream.
  *
  * It is capable of compressing response data both in content-length mode and
  * in chunked mode. The state machines follows different flows depending on
  * whether content-length and chunked modes are used, since there are no
  * trailers in content-length :
  *
  *       chk-mode        cl-mode
  *          ,----- BODY -----.
  *         /                  \
  *        V     size > 0       V    chk-mode
  *  .--> SIZE -------------> DATA -------------> CRLF
  *  |     | size == 0          | last byte         |
  *  |     v      final crlf    v inspected         |
  *  |  TRAILERS -----------> DONE                  |
  *  |                                              |
  *  `----------------------------------------------'
  *
  * Compression only happens in the DATA state, and must be flushed in final
  * states (TRAILERS/DONE) or when leaving on missing data. Normal forwarding
  * is performed at once on final states for all bytes parsed, or when leaving
  * on missing data.
  */
 int http_response_forward_body(struct stream *s, struct channel *res, int an_bit)
 {
 	struct session *sess = s->sess;
 	struct http_txn *txn = s->txn;
 	struct http_msg *msg = &s->txn->rsp;
 	struct htx *htx;
 	int ret;

 	DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn, msg);

 	htx = htxbuf(&res->buf);

 	if (htx->flags & HTX_FL_PARSING_ERROR)
 		goto return_bad_res;
 	if (htx->flags & HTX_FL_PROCESSING_ERROR)
 		goto return_int_err;

 	if ((res->flags & (CF_READ_ERROR|CF_READ_TIMEOUT|CF_WRITE_ERROR|CF_WRITE_TIMEOUT)) ||
 	    ((res->flags & CF_SHUTW) && (res->to_forward || co_data(res)))) {
 		/* Output closed while we were sending data. We must abort and
 		 * wake the other side up.
 		 */
 		msg->msg_state = HTTP_MSG_ERROR;
 		http_end_response(s);
 		http_end_request(s);
 		DBG_TRACE_DEVEL("leaving on error",
 				STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 		return 1;
 	}

 	if (msg->msg_state == HTTP_MSG_BODY)
 		msg->msg_state = HTTP_MSG_DATA;

 	/* in most states, we should abort in case of early close */
 	channel_auto_close(res);

 	if (res->to_forward) {
 		if (res->to_forward == CHN_INFINITE_FORWARD) {
 			if (res->flags & CF_EOI)
 				msg->msg_state = HTTP_MSG_ENDING;
 		}
 		else {
 			/* We can't process the buffer's contents yet */
 			res->flags |= CF_WAKE_WRITE;
 			goto missing_data_or_waiting;
 		}
 	}

 	if (msg->msg_state >= HTTP_MSG_ENDING)
 		goto ending;

 	if ((txn->meth == HTTP_METH_CONNECT && txn->status == 200) || txn->status == 101 ||
 	    (!(msg->flags & HTTP_MSGF_XFER_LEN) && !HAS_RSP_DATA_FILTERS(s))) {
 		msg->msg_state = HTTP_MSG_ENDING;
 		goto ending;
 	}

 	/* Forward input data. We get it by removing all outgoing data not
 	 * forwarded yet from HTX data size. If there are some data filters, we
 	 * let them decide the amount of data to forward.
 	 */
 	if (HAS_RSP_DATA_FILTERS(s)) {
 		ret  = flt_http_payload(s, msg, htx->data);
 		if (ret < 0)
 			goto return_bad_res;
 		c_adv(res, ret);
 	}
 	else {
 		c_adv(res, htx->data - co_data(res));
 		if (msg->flags & HTTP_MSGF_XFER_LEN)
 			channel_htx_forward_forever(res, htx);
 	}

 	if (htx->data != co_data(res))
 		goto missing_data_or_waiting;

 	if (!(msg->flags & HTTP_MSGF_XFER_LEN) && res->flags & CF_SHUTR) {
 		msg->msg_state = HTTP_MSG_ENDING;
 		goto ending;
 	}

 	/* Check if the end-of-message is reached and if so, switch the message
 	 * in HTTP_MSG_ENDING state. Then if all data was marked to be
 	 * forwarded, set the state to HTTP_MSG_DONE.
 	 */
 	if (htx_get_tail_type(htx) != HTX_BLK_EOM)
 		goto missing_data_or_waiting;

 	msg->msg_state = HTTP_MSG_ENDING;

   ending:
 	/* other states, ENDING...TUNNEL */
 	if (msg->msg_state >= HTTP_MSG_DONE)
 		goto done;

 	if (HAS_RSP_DATA_FILTERS(s)) {
 		ret = flt_http_end(s, msg);
 		if (ret <= 0) {
 			if (!ret)
 				goto missing_data_or_waiting;
 			goto return_bad_res;
 		}
 	}

 	if ((txn->meth == HTTP_METH_CONNECT && txn->status == 200) || txn->status == 101 ||
 	    !(msg->flags & HTTP_MSGF_XFER_LEN)) {
 		msg->msg_state = HTTP_MSG_TUNNEL;
 		goto ending;
 	}
 	else {
 		msg->msg_state = HTTP_MSG_DONE;
 		res->to_forward = 0;
 	}

   done:

 	channel_dont_close(res);

 	http_end_response(s);
 	if (!(res->analysers & an_bit)) {
 		http_end_request(s);
 		if (unlikely(msg->msg_state == HTTP_MSG_ERROR)) {
 			if (res->flags & CF_SHUTW) {
 				/* response errors are most likely due to the
 				 * client aborting the transfer. */
 				goto return_cli_abort;
 			}
 			goto return_bad_res;
 		}
 		DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 		return 1;
 	}
 	DBG_TRACE_DEVEL("waiting for the end of the HTTP txn",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	return 0;

   missing_data_or_waiting:
 	if (res->flags & CF_SHUTW)
 		goto return_cli_abort;

 	/* stop waiting for data if the input is closed before the end. If the
 	 * client side was already closed, it means that the client has aborted,
 	 * so we don't want to count this as a server abort. Otherwise it's a
 	 * server abort.
 	 */
 	if (msg->msg_state < HTTP_MSG_ENDING && res->flags & CF_SHUTR) {
 		if ((s->req.flags & (CF_SHUTR|CF_SHUTW)) == (CF_SHUTR|CF_SHUTW))
 			goto return_cli_abort;
 		/* If we have some pending data, we continue the processing */
 		if (htx_is_empty(htx))
 			goto return_srv_abort;
 	}

 	/* When TE: chunked is used, we need to get there again to parse
 	 * remaining chunks even if the server has closed, so we don't want to
 	 * set CF_DONTCLOSE. Similarly when there is a content-leng or if there
 	 * are filters registered on the stream, we don't want to forward a
 	 * close
 	 */
 	if ((msg->flags & HTTP_MSGF_XFER_LEN) || HAS_RSP_DATA_FILTERS(s))
 		channel_dont_close(res);

 	/* We know that more data are expected, but we couldn't send more that
 	 * what we did. So we always set the CF_EXPECT_MORE flag so that the
 	 * system knows it must not set a PUSH on this first part. Interactive
 	 * modes are already handled by the stream sock layer. We must not do
 	 * this in content-length mode because it could present the MSG_MORE
 	 * flag with the last block of forwarded data, which would cause an
 	 * additional delay to be observed by the receiver.
 	 */
 	if ((msg->flags & HTTP_MSGF_TE_CHNK) || (msg->flags & HTTP_MSGF_COMPRESSING))
 		res->flags |= CF_EXPECT_MORE;

 	/* the stream handler will take care of timeouts and errors */
 	DBG_TRACE_DEVEL("waiting for more data to forward",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA, s, txn);
 	return 0;

   return_srv_abort:
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.srv_aborts, 1);
 	_HA_ATOMIC_ADD(&s->be->be_counters.srv_aborts, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->srv_aborts, 1);
 	if (objt_server(s->target))
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.srv_aborts, 1);
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_SRVCL;
 	goto return_error;

   return_cli_abort:
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.cli_aborts, 1);
 	_HA_ATOMIC_ADD(&s->be->be_counters.cli_aborts, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->cli_aborts, 1);
 	if (objt_server(s->target))
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.cli_aborts, 1);
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_CLICL;
 	goto return_error;

   return_int_err:
 	_HA_ATOMIC_ADD(&sess->fe->fe_counters.internal_errors, 1);
 	_HA_ATOMIC_ADD(&s->be->be_counters.internal_errors, 1);
 	if (sess->listener->counters)
 		_HA_ATOMIC_ADD(&sess->listener->counters->internal_errors, 1);
 	if (objt_server(s->target))
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.internal_errors, 1);
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_INTERNAL;
 	goto return_error;

   return_bad_res:
 	_HA_ATOMIC_ADD(&s->be->be_counters.failed_resp, 1);
 	if (objt_server(s->target)) {
 		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.failed_resp, 1);
 		health_adjust(__objt_server(s->target), HANA_STATUS_HTTP_RSP);
 	}
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_SRVCL;
 	/* fall through */

    return_error:
 	/* don't send any error message as we're in the body */
 	http_reply_and_close(s, txn->status, NULL);
 	res->analysers   &= AN_RES_FLT_END;
 	s->req.analysers &= AN_REQ_FLT_END; /* we're in data phase, we want to abort both directions */
 	if (!(s->flags & SF_FINST_MASK))
 		s->flags |= SF_FINST_D;
 	DBG_TRACE_DEVEL("leaving on error",
 			STRM_EV_STRM_ANA|STRM_EV_HTTP_ANA|STRM_EV_HTTP_ERR, s, txn);
 	return 0;
 }

 /* Perform an HTTP redirect based on the information in <rule>. The function
  * returns zero on success, or zero in case of a, irrecoverable error such
  * as too large a request to build a valid response.
  */
 int http_apply_redirect_rule(struct redirect_rule *rule, struct stream *s, struct http_txn *txn)
 {
 	struct channel *req = &s->req;
 	struct channel *res = &s->res;
 	struct htx *htx;
 	struct htx_sl *sl;
 	struct buffer *chunk;
 	struct ist status, reason, location;
 	unsigned int flags;
 	int close = 0; /* Try to keep the connection alive byt default */

 	chunk = alloc_trash_chunk();
 	if (!chunk) {
 		if (!(s->flags & SF_ERR_MASK))
 			s->flags |= SF_ERR_RESOURCE;
 		goto fail;
 	}

 	/*
 	 * Create the location
 	 */
 	htx = htxbuf(&req->buf);
 	switch(rule->type) {
 		case REDIRECT_TYPE_SCHEME: {
 			struct http_hdr_ctx ctx;
 			struct ist path, host;

 			host = ist("");
 			ctx.blk = NULL;
 			if (http_find_header(htx, ist("Host"), &ctx, 0))
 				host = ctx.value;

 			sl = http_get_stline(htx);
 			path = http_get_path(htx_sl_req_uri(sl));
 			/* build message using path */
 			if (path.ptr) {
 				if (rule->flags & REDIRECT_FLAG_DROP_QS) {
 					int qs = 0;
 					while (qs < path.len) {
 						if (*(path.ptr + qs) == '?') {
 							path.len = qs;
 							break;
 						}
 						qs++;
 					}
 				}
 			}
 			else
 				path = ist("/");

 			if (rule->rdr_str) { /* this is an old "redirect" rule */
 				/* add scheme */
 				if (!chunk_memcat(chunk, rule->rdr_str, rule->rdr_len))
 					goto fail;
 			}
 			else {
 				/* add scheme with executing log format */
 				chunk->data += build_logline(s, chunk->area + chunk->data,
 							     chunk->size - chunk->data,
 							     &rule->rdr_fmt);
 			}
 			/* add "://" + host + path */
 			if (!chunk_memcat(chunk, "://", 3) ||
 			    !chunk_memcat(chunk, host.ptr, host.len) ||
 			    !chunk_memcat(chunk, path.ptr, path.len))
 				goto fail;

 			/* append a slash at the end of the location if needed and missing */
 			if (chunk->data && chunk->area[chunk->data - 1] != '/' &&
 			    (rule->flags & REDIRECT_FLAG_APPEND_SLASH)) {
 				if (chunk->data + 1 >= chunk->size)
 					goto fail;
 				chunk->area[chunk->data++] = '/';
 			}
 			break;
 		}

 		case REDIRECT_TYPE_PREFIX: {
 			struct ist path;

 			sl = http_get_stline(htx);
 			path = http_get_path(htx_sl_req_uri(sl));
 			/* build message using path */
 			if (path.ptr) {
 				if (rule->flags & REDIRECT_FLAG_DROP_QS) {
 					int qs = 0;
 					while (qs < path.len) {
 						if (*(path.ptr + qs) == '?') {
 							path.len = qs;
 							break;
 						}
 						qs++;
 					}
 				}
 			}
 			else
 				path = ist("/");

 			if (rule->rdr_str) { /* this is an old "redirect" rule */
 				/* add prefix. Note that if prefix == "/", we don't want to
 				 * add anything, otherwise it makes it hard for the user to
 				 * configure a self-redirection.
 				 */
 				if (rule->rdr_len != 1 || *rule->rdr_str != '/') {
 					if (!chunk_memcat(chunk, rule->rdr_str, rule->rdr_len))
 						goto fail;
 				}
 			}
 			else {
 				/* add prefix with executing log format */
 				chunk->data += build_logline(s, chunk->area + chunk->data,
 							     chunk->size - chunk->data,
 							     &rule->rdr_fmt);
 			}

 			/* add path */
 			if (!chunk_memcat(chunk, path.ptr, path.len))
 				goto fail;

 			/* append a slash at the end of the location if needed and missing */
 			if (chunk->data && chunk->area[chunk->data - 1] != '/' &&
 			    (rule->flags & REDIRECT_FLAG_APPEND_SLASH)) {
 				if (chunk->data + 1 >= chunk->size)
 					goto fail;
 				chunk->area[chunk->data++] = '/';
 			}
 			break;
 		}
 		case REDIRECT_TYPE_LOCATION:
 		default:
 			if (rule->rdr_str) { /* this is an old "redirect" rule */
 				/* add location */
 				if (!chunk_memcat(chunk, rule->rdr_str, rule->rdr_len))
 					goto fail;
 			}
 			else {
 				/* add location with executing log format */
 				chunk->data += build_logline(s, chunk->area + chunk->data,
 							     chunk->size - chunk->data,
 							     &rule->rdr_fmt);
 			}
 			break;
 	}
 	location = ist2(chunk->area, chunk->data);

 	/*
 	 * Create the 30x response
 	 */
 	switch (rule->code) {
 		case 308:
 			status = ist("308");
 			reason = ist("Permanent Redirect");
 			break;
 		case 307:
 			status = ist("307");
 			reason = ist("Temporary Redirect");
 			break;
 		case 303:
 			status = ist("303");
 			reason = ist("See Other");
 			break;
 		case 301:
 			status = ist("301");
 			reason = ist("Moved Permanently");
 			break;
 		case 302:
 		default:
 			status = ist("302");
 			reason = ist("Found");
 			break;
 	}

 	if (!(txn->req.flags & HTTP_MSGF_BODYLESS) && txn->req.msg_state != HTTP_MSG_DONE)
 		close = 1;

 	htx = htx_from_buf(&res->buf);
 	/* Trim any possible response */
 	channel_htx_truncate(&s->res, htx);
 	flags = (HTX_SL_F_IS_RESP|HTX_SL_F_VER_11|HTX_SL_F_XFER_LEN|HTX_SL_F_BODYLESS);
 	sl = htx_add_stline(htx, HTX_BLK_RES_SL, flags, ist("HTTP/1.1"), status, reason);
 	if (!sl)
 		goto fail;
 	sl->info.res.status = rule->code;
 	s->txn->status = rule->code;

 	if (close && !htx_add_header(htx, ist("Connection"), ist("close")))
 		goto fail;

 	if (!htx_add_header(htx, ist("Content-length"), ist("0")) ||
 	    !htx_add_header(htx, ist("Location"), location))
 		goto fail;

 	if (rule->code == 302 || rule->code == 303 || rule->code == 307) {
 		if (!htx_add_header(htx, ist("Cache-Control"), ist("no-cache")))
 			goto fail;
 	}

 	if (rule->cookie_len) {
 		if (!htx_add_header(htx, ist("Set-Cookie"), ist2(rule->cookie_str, rule->cookie_len)))
 			goto fail;
 	}

 	if (!htx_add_endof(htx, HTX_BLK_EOH) || !htx_add_endof(htx, HTX_BLK_EOM))
 		goto fail;

 	htx_to_buf(htx, &res->buf);
 	if (!http_forward_proxy_resp(s, 1))
 		goto fail;

 	if (rule->flags & REDIRECT_FLAG_FROM_REQ) {
 		/* let's log the request time */
 		s->logs.tv_request = now;
 		req->analysers &= AN_REQ_FLT_END;

 		if (s->sess->fe == s->be) /* report it if the request was intercepted by the frontend */
 			_HA_ATOMIC_ADD(&s->sess->fe->fe_counters.intercepted_req, 1);
 	}

 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_LOCAL;
 	if (!(s->flags & SF_FINST_MASK))
 		s->flags |= ((rule->flags & REDIRECT_FLAG_FROM_REQ) ? SF_FINST_R : SF_FINST_H);

 	free_trash_chunk(chunk);
 	return 1;

   fail:
 	/* If an error occurred, remove the incomplete HTTP response from the
 	 * buffer */
 	channel_htx_truncate(res, htxbuf(&res->buf));
 	free_trash_chunk(chunk);
 	return 0;
 }

 /* Replace all headers matching the name <name>. The header value is replaced if
  * it matches the regex <re>. <str> is used for the replacement. If <full> is
  * set to 1, the full-line is matched and replaced. Otherwise, comma-separated
  * values are evaluated one by one. It returns 0 on success and -1 on error.
  */
 int http_replace_hdrs(struct stream* s, struct htx *htx, struct ist name,
 		     const char *str, struct my_regex *re, int full)
 {
 	struct http_hdr_ctx ctx;
 	struct buffer *output = get_trash_chunk();

 	ctx.blk = NULL;
 	while (http_find_header(htx, name, &ctx, full)) {
 		if (!regex_exec_match2(re, ctx.value.ptr, ctx.value.len, MAX_MATCH, pmatch, 0))
 			continue;

 		output->data = exp_replace(output->area, output->size, ctx.value.ptr, str, pmatch);
 		if (output->data == -1)
 			return -1;
 		if (!http_replace_header_value(htx, &ctx, ist2(output->area, output->data)))
 			return -1;
 	}
 	return 0;
 }

 /* This function executes one of the set-{method,path,query,uri} actions. It
  * takes the string from the variable 'replace' with length 'len', then modifies
  * the relevant part of the request line accordingly. Then it updates various
  * pointers to the next elements which were moved, and the total buffer length.
  * It finds the action to be performed in p[2], previously filled by function
  * parse_set_req_line(). It returns 0 in case of success, -1 in case of internal
  * error, though this can be revisited when this code is finally exploited.
  *
  * 'action' can be '0' to replace method, '1' to replace path, '2' to replace
  * query string and 3 to replace uri.
  *
  * In query string case, the mark question '?' must be set at the start of the
  * string by the caller, event if the replacement query string is empty.
  */
 int http_req_replace_stline(int action, const char *replace, int len,
 			    struct proxy *px, struct stream *s)
 {
 	struct htx *htx = htxbuf(&s->req.buf);

 	switch (action) {
 		case 0: // method
 			if (!http_replace_req_meth(htx, ist2(replace, len)))
 				return -1;
 			break;

 		case 1: // path
 			if (!http_replace_req_path(htx, ist2(replace, len)))
 				return -1;
 			break;

 		case 2: // query
 			if (!http_replace_req_query(htx, ist2(replace, len)))
 				return -1;
 			break;

 		case 3: // uri
 			if (!http_replace_req_uri(htx, ist2(replace, len)))
 				return -1;
 			break;

 		default:
 			return -1;
 	}
 	return 0;
 }

 /* This function replace the HTTP status code and the associated message. The
  * variable <status> contains the new status code. This function never fails. It
  * returns 0 in case of success, -1 in case of internal error.
  */
 int http_res_set_status(unsigned int status, struct ist reason, struct stream *s)
 {
 	struct htx *htx = htxbuf(&s->res.buf);
 	char *res;

 	chunk_reset(&trash);
 	res = ultoa_o(status, trash.area, trash.size);
 	trash.data = res - trash.area;

 	/* Do we have a custom reason format string? */
 	if (reason.ptr == NULL) {
 		const char *str = http_get_reason(status);
 		reason = ist2(str, strlen(str));
 	}

 	if (!http_replace_res_status(htx, ist2(trash.area, trash.data)))
 		return -1;
 	if (!http_replace_res_reason(htx, reason))
 		return -1;
 	return 0;
 }

 /* Executes the http-request rules <rules> for stream <s>, proxy <px> and
  * transaction <txn>. Returns the verdict of the first rule that prevents
  * further processing of the request (auth, deny, ...), and defaults to
  * HTTP_RULE_RES_STOP if it executed all rules or stopped on an allow, or
  * HTTP_RULE_RES_CONT if the last rule was reached. It may set the TX_CLTARPIT
  * on txn->flags if it encounters a tarpit rule. If <deny_status> is not NULL
  * and a deny/tarpit rule is matched, it will be filled with this rule's deny
  * status.
  */
 static enum rule_result http_req_get_intercept_rule(struct proxy *px, struct list *rules,
 						    struct stream *s)
 {
 	struct session *sess = strm_sess(s);
 	struct http_txn *txn = s->txn;
 	struct htx *htx;
 	struct act_rule *rule;
 	struct http_hdr_ctx ctx;
 	const char *auth_realm;
 	enum rule_result rule_ret = HTTP_RULE_RES_CONT;
 	int act_opts = 0;

 	htx = htxbuf(&s->req.buf);

 	/* If "the current_rule_list" match the executed rule list, we are in
 	 * resume condition. If a resume is needed it is always in the action
 	 * and never in the ACL or converters. In this case, we initialise the
 	 * current rule, and go to the action execution point.
 	 */
 	if (s->current_rule) {
 		rule = s->current_rule;
 		s->current_rule = NULL;
 		if (s->current_rule_list == rules)
 			goto resume_execution;
 	}
 	s->current_rule_list = rules;

 	/* start the ruleset evaluation in strict mode */
 	txn->req.flags &= ~HTTP_MSGF_SOFT_RW;

 	list_for_each_entry(rule, rules, list) {
 		/* check optional condition */
 		if (rule->cond) {
 			int ret;

 			ret = acl_exec_cond(rule->cond, px, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
 			ret = acl_pass(ret);

 			if (rule->cond->pol == ACL_COND_UNLESS)
 				ret = !ret;

 			if (!ret) /* condition not matched */
 				continue;
 		}

 		act_opts |= ACT_OPT_FIRST;
   resume_execution:
 		/* Always call the action function if defined */
 		if (rule->action_ptr) {
 			if ((s->req.flags & CF_READ_ERROR) ||
 			    ((s->req.flags & (CF_SHUTR|CF_READ_NULL)) &&
 			     (px->options & PR_O_ABRT_CLOSE)))
 				act_opts |= ACT_OPT_FINAL;

 			switch (rule->action_ptr(rule, px, sess, s, act_opts)) {
 				case ACT_RET_CONT:
 					break;
 				case ACT_RET_STOP:
 					rule_ret = HTTP_RULE_RES_STOP;
 					goto end;
 				case ACT_RET_YIELD:
 					s->current_rule = rule;
 					rule_ret = HTTP_RULE_RES_YIELD;
 					goto end;
 				case ACT_RET_ERR:
 					rule_ret = HTTP_RULE_RES_ERROR;
 					goto end;
 				case ACT_RET_DONE:
 					rule_ret = HTTP_RULE_RES_DONE;
 					goto end;
 				case ACT_RET_DENY:
 					txn->flags |= TX_CLDENY;
 					if (txn->status == -1)
 						txn->status = 403;
 					rule_ret = HTTP_RULE_RES_DENY;
 					goto end;
 				case ACT_RET_ABRT:
 					rule_ret = HTTP_RULE_RES_ABRT;
 					goto end;
 				case ACT_RET_INV:
 					rule_ret = HTTP_RULE_RES_BADREQ;
 					goto end;
 			}
 			continue; /* eval the next rule */
 		}

 		/* If not action function defined, check for known actions */
 		switch (rule->action) {
 			case ACT_ACTION_ALLOW:
 				rule_ret = HTTP_RULE_RES_STOP;
 				goto end;

 			case ACT_ACTION_DENY:
 				txn->flags |= TX_CLDENY;
 				txn->status = rule->arg.http_deny.status;
 				if (rule->arg.http_deny.errmsg)
 					txn->errmsg = rule->arg.http_deny.errmsg;
 				rule_ret = HTTP_RULE_RES_DENY;
 				goto end;

 			case ACT_HTTP_REQ_TARPIT:
 				txn->flags |= TX_CLTARPIT;
 				txn->status = rule->arg.http_deny.status;
 				if (rule->arg.http_deny.errmsg)
 					txn->errmsg = rule->arg.http_deny.errmsg;
 				rule_ret = HTTP_RULE_RES_DENY;
 				goto end;

 			case ACT_HTTP_REQ_AUTH:
 				/* Auth might be performed on regular http-req rules as well as on stats */
 				auth_realm = rule->arg.http.str.ptr;
 				if (!auth_realm) {
 					if (px->uri_auth && rules == &px->uri_auth->http_req_rules)
 						auth_realm = STATS_DEFAULT_REALM;
 					else
 						auth_realm = px->id;
 				}
 				/* send 401/407 depending on whether we use a proxy or not. We still
 				 * count one error, because normal browsing won't significantly
 				 * increase the counter but brute force attempts will.
 				 */
 				rule_ret = HTTP_RULE_RES_ABRT;
 				if (http_reply_40x_unauthorized(s, auth_realm) == -1)
 					rule_ret = HTTP_RULE_RES_ERROR;
 				stream_inc_http_err_ctr(s);
 				goto end;

 			case ACT_HTTP_REDIR:
 				rule_ret = HTTP_RULE_RES_DONE;
 				if (!http_apply_redirect_rule(rule->arg.redir, s, txn))
 					rule_ret = HTTP_RULE_RES_ERROR;
 				goto end;

 			case ACT_HTTP_SET_NICE:
 				s->task->nice = rule->arg.http.i;
 				break;

 			case ACT_HTTP_SET_TOS:
 				conn_set_tos(objt_conn(sess->origin), rule->arg.http.i);
 				break;

 			case ACT_HTTP_SET_MARK:
 				conn_set_mark(objt_conn(sess->origin), rule->arg.http.i);
 				break;

 			case ACT_HTTP_SET_LOGL:
 				s->logs.level = rule->arg.http.i;
 				break;

 			case ACT_HTTP_DEL_HDR:
 				/* remove all occurrences of the header */
 				ctx.blk = NULL;
 				while (http_find_header(htx, rule->arg.http.str, &ctx, 1))
 					http_remove_header(htx, &ctx);
 				break;

 			/* other flags exists, but normally, they never be matched. */
 			default:
 				break;
 		}
 	}

   end:
 	/* if the ruleset evaluation is finished reset the strict mode */
 	if (rule_ret != HTTP_RULE_RES_YIELD)
 		txn->req.flags &= ~HTTP_MSGF_SOFT_RW;

 	/* we reached the end of the rules, nothing to report */
 	return rule_ret;
 }

 /* Executes the http-response rules <rules> for stream <s> and proxy <px>. It
  * returns one of 5 possible statuses: HTTP_RULE_RES_CONT, HTTP_RULE_RES_STOP,
  * HTTP_RULE_RES_DONE, HTTP_RULE_RES_YIELD, or HTTP_RULE_RES_BADREQ. If *CONT
  * is returned, the process can continue the evaluation of next rule list. If
  * *STOP or *DONE is returned, the process must stop the evaluation. If *BADREQ
  * is returned, it means the operation could not be processed and a server error
  * must be returned. It may set the TX_SVDENY on txn->flags if it encounters a
  * deny rule. If *YIELD is returned, the caller must call again the function
  * with the same context.
  */
 static enum rule_result http_res_get_intercept_rule(struct proxy *px, struct list *rules,
 						    struct stream *s)
 {
 	struct session *sess = strm_sess(s);
 	struct http_txn *txn = s->txn;
 	struct htx *htx;
 	struct act_rule *rule;
 	struct http_hdr_ctx ctx;
 	enum rule_result rule_ret = HTTP_RULE_RES_CONT;
 	int act_opts = 0;

 	htx = htxbuf(&s->res.buf);

 	/* If "the current_rule_list" match the executed rule list, we are in
 	 * resume condition. If a resume is needed it is always in the action
 	 * and never in the ACL or converters. In this case, we initialise the
 	 * current rule, and go to the action execution point.
 	 */
 	if (s->current_rule) {
 		rule = s->current_rule;
 		s->current_rule = NULL;
 		if (s->current_rule_list == rules)
 			goto resume_execution;
 	}
 	s->current_rule_list = rules;

 	/* start the ruleset evaluation in strict mode */
 	txn->rsp.flags &= ~HTTP_MSGF_SOFT_RW;

 	list_for_each_entry(rule, rules, list) {
 		/* check optional condition */
 		if (rule->cond) {
 			int ret;

 			ret = acl_exec_cond(rule->cond, px, sess, s, SMP_OPT_DIR_RES|SMP_OPT_FINAL);
 			ret = acl_pass(ret);

 			if (rule->cond->pol == ACL_COND_UNLESS)
 				ret = !ret;

 			if (!ret) /* condition not matched */
 				continue;
 		}

 		act_opts |= ACT_OPT_FIRST;
 resume_execution:

 		/* Always call the action function if defined */
 		if (rule->action_ptr) {
 			if ((s->req.flags & CF_READ_ERROR) ||
 			    ((s->req.flags & (CF_SHUTR|CF_READ_NULL)) &&
 			     (px->options & PR_O_ABRT_CLOSE)))
 				act_opts |= ACT_OPT_FINAL;

 			switch (rule->action_ptr(rule, px, sess, s, act_opts)) {
 				case ACT_RET_CONT:
 					break;
 				case ACT_RET_STOP:
 					rule_ret = HTTP_RULE_RES_STOP;
 					goto end;
 				case ACT_RET_YIELD:
 					s->current_rule = rule;
 					rule_ret = HTTP_RULE_RES_YIELD;
 					goto end;
 				case ACT_RET_ERR:
 					rule_ret = HTTP_RULE_RES_ERROR;
 					goto end;
 				case ACT_RET_DONE:
 					rule_ret = HTTP_RULE_RES_DONE;
 					goto end;
 				case ACT_RET_DENY:
 					txn->flags |= TX_CLDENY;
 					if (txn->status == -1)
 						txn->status = 502;
 					rule_ret = HTTP_RULE_RES_DENY;
 					goto end;
 				case ACT_RET_ABRT:
 					rule_ret = HTTP_RULE_RES_ABRT;
 					goto end;
 				case ACT_RET_INV:
 					rule_ret = HTTP_RULE_RES_BADREQ;
 					goto end;
 			}
 			continue; /* eval the next rule */
 		}

 		/* If not action function defined, check for known actions */
 		switch (rule->action) {
 			case ACT_ACTION_ALLOW:
 				rule_ret = HTTP_RULE_RES_STOP; /* "allow" rules are OK */
 				goto end;

 			case ACT_ACTION_DENY:
 				txn->flags |= TX_CLDENY;
 				txn->status = rule->arg.http_deny.status;
 				if (rule->arg.http_deny.errmsg)
 					txn->errmsg = rule->arg.http_deny.errmsg;
 				rule_ret = HTTP_RULE_RES_DENY;
 				goto end;

 			case ACT_HTTP_SET_NICE:
 				s->task->nice = rule->arg.http.i;
 				break;

 			case ACT_HTTP_SET_TOS:
 				conn_set_tos(objt_conn(sess->origin), rule->arg.http.i);
 				break;

 			case ACT_HTTP_SET_MARK:
 				conn_set_mark(objt_conn(sess->origin), rule->arg.http.i);
 				break;

 			case ACT_HTTP_SET_LOGL:
 				s->logs.level = rule->arg.http.i;
 				break;

 			case ACT_HTTP_DEL_HDR:
 				/* remove all occurrences of the header */
 				ctx.blk = NULL;
 				while (http_find_header(htx, rule->arg.http.str, &ctx, 1))
 					http_remove_header(htx, &ctx);
 				break;

 			case ACT_HTTP_REDIR:
 				rule_ret = HTTP_RULE_RES_DONE;
 				if (!http_apply_redirect_rule(rule->arg.redir, s, txn))
 					rule_ret = HTTP_RULE_RES_ERROR;
 				goto end;

 			/* other flags exists, but normally, they never be matched. */
 			default:
 				break;
 		}
 	}

   end:
 	/* if the ruleset evaluation is finished reset the strict mode */
 	if (rule_ret != HTTP_RULE_RES_YIELD)
 		txn->rsp.flags &= ~HTTP_MSGF_SOFT_RW;

 	/* we reached the end of the rules, nothing to report */
 	return rule_ret;
 }

 /* Executes backend and frontend http-after-response rules for the stream <s>,
  * in that order. it return 1 on success and 0 on error. It is the caller
  * responsibility to catch error or ignore it. If it catches it, this function
  * may be called a second time, for the internal error.
  */
 int http_eval_after_res_rules(struct stream *s)
 {
 	struct session *sess = s->sess;
 	enum rule_result ret = HTTP_RULE_RES_CONT;

 	/* prune the request variables if not already done and swap to the response variables. */
 	if (s->vars_reqres.scope != SCOPE_RES) {
 		if (!LIST_ISEMPTY(&s->vars_reqres.head))
 			vars_prune(&s->vars_reqres, s->sess, s);
 		vars_init(&s->vars_reqres, SCOPE_RES);
 	}

 	ret = http_res_get_intercept_rule(s->be, &s->be->http_after_res_rules, s);
 	if ((ret == HTTP_RULE_RES_CONT || ret == HTTP_RULE_RES_STOP) && sess->fe != s->be)
 		ret = http_res_get_intercept_rule(sess->fe, &sess->fe->http_after_res_rules, s);

 	/* All other codes than CONTINUE, STOP or DONE are forbidden */
 	return (ret == HTTP_RULE_RES_CONT || ret == HTTP_RULE_RES_STOP || ret == HTTP_RULE_RES_DONE);
 }

 /*
  * Manage client-side cookie. It can impact performance by about 2% so it is
  * desirable to call it only when needed. This code is quite complex because
  * of the multiple very crappy and ambiguous syntaxes we have to support. it
  * highly recommended not to touch this part without a good reason !
  */
 static void http_manage_client_side_cookies(struct stream *s, struct channel *req)
 {
 	struct session *sess = s->sess;
 	struct http_txn *txn = s->txn;
 	struct htx *htx;
 	struct http_hdr_ctx ctx;
 	char *hdr_beg, *hdr_end, *del_from;
 	char *prev, *att_beg, *att_end, *equal, *val_beg, *val_end, *next;
 	int preserve_hdr;

 	htx = htxbuf(&req->buf);
 	ctx.blk = NULL;
 	while (http_find_header(htx, ist("Cookie"), &ctx, 1)) {
 		int is_first = 1;
 		del_from = NULL;  /* nothing to be deleted */
 		preserve_hdr = 0; /* assume we may kill the whole header */

 		/* Now look for cookies. Conforming to RFC2109, we have to support
 		 * attributes whose name begin with a '$', and associate them with
 		 * the right cookie, if we want to delete this cookie.
 		 * So there are 3 cases for each cookie read :
 		 * 1) it's a special attribute, beginning with a '$' : ignore it.
 		 * 2) it's a server id cookie that we *MAY* want to delete : save
 		 *    some pointers on it (last semi-colon, beginning of cookie...)
 		 * 3) it's an application cookie : we *MAY* have to delete a previous
 		 *    "special" cookie.
 		 * At the end of loop, if a "special" cookie remains, we may have to
 		 * remove it. If no application cookie persists in the header, we
 		 * *MUST* delete it.
 		 *
 		 * Note: RFC2965 is unclear about the processing of spaces around
 		 * the equal sign in the ATTR=VALUE form. A careful inspection of
 		 * the RFC explicitly allows spaces before it, and not within the
 		 * tokens (attrs or values). An inspection of RFC2109 allows that
 		 * too but section 10.1.3 lets one think that spaces may be allowed
 		 * after the equal sign too, resulting in some (rare) buggy
 		 * implementations trying to do that. So let's do what servers do.
 		 * Latest ietf draft forbids spaces all around. Also, earlier RFCs
 		 * allowed quoted strings in values, with any possible character
 		 * after a backslash, including control chars and delimitors, which
 		 * causes parsing to become ambiguous. Browsers also allow spaces
 		 * within values even without quotes.
 		 *
 		 * We have to keep multiple pointers in order to support cookie
 		 * removal at the beginning, middle or end of header without
 		 * corrupting the header. All of these headers are valid :
 		 *
 		 * hdr_beg                                               hdr_end
 		 * |                                                        |
 		 * v                                                        |
 		 * NAME1=VALUE1;NAME2=VALUE2;NAME3=VALUE3                   |
 		 * NAME1=VALUE1;NAME2_ONLY ;NAME3=VALUE3                    v
 		 *      NAME1  =  VALUE 1  ; NAME2 = VALUE2 ; NAME3 = VALUE3
 		 * |    |    | |  |      | |
 		 * |    |    | |  |      | |
 		 * |    |    | |  |      | +--> next
 		 * |    |    | |  |      +----> val_end
 		 * |    |    | |  +-----------> val_beg
 		 * |    |    | +--------------> equal
 		 * |    |    +----------------> att_end
 		 * |    +---------------------> att_beg
 		 * +--------------------------> prev
 		 *
 		 */
 		hdr_beg = ctx.value.ptr;
 		hdr_end = hdr_beg + ctx.value.len;
 		for (prev = hdr_beg; prev < hdr_end; prev = next) {
 			/* Iterate through all cookies on this line */

 			/* find att_beg */
 			att_beg = prev;
 			if (!is_first)
 				att_beg++;
 			is_first = 0;

 			while (att_beg < hdr_end && HTTP_IS_SPHT(*att_beg))
 				att_beg++;

 			/* find att_end : this is the first character after the last non
 			 * space before the equal. It may be equal to hdr_end.
 			 */
 			equal = att_end = att_beg;
 			while (equal < hdr_end) {
 				if (*equal == '=' || *equal == ',' || *equal == ';')
 					break;
 				if (HTTP_IS_SPHT(*equal++))
 					continue;
 				att_end = equal;
 			}

 			/* here, <equal> points to '=', a delimitor or the end. <att_end>
 			 * is between <att_beg> and <equal>, both may be identical.
 			 */
 			/* look for end of cookie if there is an equal sign */
 			if (equal < hdr_end && *equal == '=') {
 				/* look for the beginning of the value */
 				val_beg = equal + 1;
 				while (val_beg < hdr_end && HTTP_IS_SPHT(*val_beg))
 					val_beg++;

 				/* find the end of the value, respecting quotes */
 				next = http_find_cookie_value_end(val_beg, hdr_end);

 				/* make val_end point to the first white space or delimitor after the value */
 				val_end = next;
 				while (val_end > val_beg && HTTP_IS_SPHT(*(val_end - 1)))
 					val_end--;
 			}
 			else
 				val_beg = val_end = next = equal;

 			/* We have nothing to do with attributes beginning with
 			 * '$'. However, they will automatically be removed if a
 			 * header before them is removed, since they're supposed
 			 * to be linked together.
 			 */
 			if (*att_beg == '$')
 				continue;

 			/* Ignore cookies with no equal sign */
 			if (equal == next) {
 				/* This is not our cookie, so we must preserve it. But if we already
 				 * scheduled another cookie for removal, we cannot remove the
 				 * complete header, but we can remove the previous block itself.
 				 */
 				preserve_hdr = 1;
 				if (del_from != NULL) {
 					int delta = http_del_hdr_value(hdr_beg, hdr_end, &del_from, prev);
 					val_end  += delta;
 					next     += delta;
 					hdr_end  += delta;
 					prev     = del_from;
 					del_from = NULL;
 				}
 				continue;
 			}

 			/* if there are spaces around the equal sign, we need to
 			 * strip them otherwise we'll get trouble for cookie captures,
 			 * or even for rewrites. Since this happens extremely rarely,
 			 * it does not hurt performance.
 			 */
 			if (unlikely(att_end != equal || val_beg > equal + 1)) {
 				int stripped_before = 0;
 				int stripped_after = 0;

 				if (att_end != equal) {
 					memmove(att_end, equal, hdr_end - equal);
 					stripped_before = (att_end - equal);
 					equal   += stripped_before;
 					val_beg += stripped_before;
 				}

 				if (val_beg > equal + 1) {
 					memmove(equal + 1, val_beg, hdr_end + stripped_before - val_beg);
 					stripped_after = (equal + 1) - val_beg;
 					val_beg += stripped_after;
 					stripped_before += stripped_after;
 				}

 				val_end      += stripped_before;
 				next         += stripped_before;
 				hdr_end      += stripped_before;
 			}
 			/* now everything is as on the diagram above */

 			/* First, let's see if we want to capture this cookie. We check
 			 * that we don't already have a client side cookie, because we
 			 * can only capture one. Also as an optimisation, we ignore
 			 * cookies shorter than the declared name.
 			 */
 			if (sess->fe->capture_name != NULL && txn->cli_cookie == NULL &&
 			    (val_end - att_beg >= sess->fe->capture_namelen) &&
 			    memcmp(att_beg, sess->fe->capture_name, sess->fe->capture_namelen) == 0) {
 				int log_len = val_end - att_beg;

 				if ((txn->cli_cookie = pool_alloc(pool_head_capture)) == NULL) {
 					ha_alert("HTTP logging : out of memory.\n");
 				} else {
 					if (log_len > sess->fe->capture_len)
 						log_len = sess->fe->capture_len;
 					memcpy(txn->cli_cookie, att_beg, log_len);
 					txn->cli_cookie[log_len] = 0;
 				}
 			}

 			/* Persistence cookies in passive, rewrite or insert mode have the
 			 * following form :
 			 *
 			 *    Cookie: NAME=SRV[|<lastseen>[|<firstseen>]]
 			 *
 			 * For cookies in prefix mode, the form is :
 			 *
 			 *    Cookie: NAME=SRV~VALUE
 			 */
 			if ((att_end - att_beg == s->be->cookie_len) && (s->be->cookie_name != NULL) &&
 			    (memcmp(att_beg, s->be->cookie_name, att_end - att_beg) == 0)) {
 				struct server *srv = s->be->srv;
 				char *delim;

 				/* if we're in cookie prefix mode, we'll search the delimitor so that we
 				 * have the server ID between val_beg and delim, and the original cookie between
 				 * delim+1 and val_end. Otherwise, delim==val_end :
 				 *
 				 * hdr_beg
 				 * |
 				 * v
 				 * NAME=SRV;          # in all but prefix modes
 				 * NAME=SRV~OPAQUE ;  # in prefix mode
 				 * ||   ||  |      |+-> next
 				 * ||   ||  |      +--> val_end
 				 * ||   ||  +---------> delim
 				 * ||   |+------------> val_beg
 				 * ||   +-------------> att_end = equal
 				 * |+-----------------> att_beg
 				 * +------------------> prev
 				 *
 				 */
 				if (s->be->ck_opts & PR_CK_PFX) {
 					for (delim = val_beg; delim < val_end; delim++)
 						if (*delim == COOKIE_DELIM)
 							break;
 				}
 				else {
 					char *vbar1;
 					delim = val_end;
 					/* Now check if the cookie contains a date field, which would
 					 * appear after a vertical bar ('|') just after the server name
 					 * and before the delimiter.
 					 */
 					vbar1 = memchr(val_beg, COOKIE_DELIM_DATE, val_end - val_beg);
 					if (vbar1) {
 						/* OK, so left of the bar is the server's cookie and
 						 * right is the last seen date. It is a base64 encoded
 						 * 30-bit value representing the UNIX date since the
 						 * epoch in 4-second quantities.
 						 */
 						int val;
 						delim = vbar1++;
 						if (val_end - vbar1 >= 5) {
 							val = b64tos30(vbar1);
 							if (val > 0)
 								txn->cookie_last_date = val << 2;
 						}
 						/* look for a second vertical bar */
 						vbar1 = memchr(vbar1, COOKIE_DELIM_DATE, val_end - vbar1);
 						if (vbar1 && (val_end - vbar1 > 5)) {
 							val = b64tos30(vbar1 + 1);
 							if (val > 0)
 								txn->cookie_first_date = val << 2;
 						}
 					}
 				}

 				/* if the cookie has an expiration date and the proxy wants to check
 				 * it, then we do that now. We first check if the cookie is too old,
 				 * then only if it has expired. We detect strict overflow because the
 				 * time resolution here is not great (4 seconds). Cookies with dates
 				 * in the future are ignored if their offset is beyond one day. This
 				 * allows an admin to fix timezone issues without expiring everyone
 				 * and at the same time avoids keeping unwanted side effects for too
 				 * long.
 				 */
 				if (txn->cookie_first_date && s->be->cookie_maxlife &&
 				    (((signed)(date.tv_sec - txn->cookie_first_date) > (signed)s->be->cookie_maxlife) ||
 				     ((signed)(txn->cookie_first_date - date.tv_sec) > 86400))) {
 					txn->flags &= ~TX_CK_MASK;
 					txn->flags |= TX_CK_OLD;
 					delim = val_beg; // let's pretend we have not found the cookie
 					txn->cookie_first_date = 0;
 					txn->cookie_last_date = 0;
 				}
 				else if (txn->cookie_last_date && s->be->cookie_maxidle &&
 					 (((signed)(date.tv_sec - txn->cookie_last_date) > (signed)s->be->cookie_maxidle) ||
 					  ((signed)(txn->cookie_last_date - date.tv_sec) > 86400))) {
 					txn->flags &= ~TX_CK_MASK;
 					txn->flags |= TX_CK_EXPIRED;
 					delim = val_beg; // let's pretend we have not found the cookie
 					txn->cookie_first_date = 0;
 					txn->cookie_last_date = 0;
 				}

 				/* Here, we'll look for the first running server which supports the cookie.
 				 * This allows to share a same cookie between several servers, for example
 				 * to dedicate backup servers to specific servers only.
 				 * However, to prevent clients from sticking to cookie-less backup server
 				 * when they have incidentely learned an empty cookie, we simply ignore
 				 * empty cookies and mark them as invalid.
 				 * The same behaviour is applied when persistence must be ignored.
 				 */
 				if ((delim == val_beg) || (s->flags & (SF_IGNORE_PRST | SF_ASSIGNED)))
 					srv = NULL;

 				while (srv) {
 					if (srv->cookie && (srv->cklen == delim - val_beg) &&
 					    !memcmp(val_beg, srv->cookie, delim - val_beg)) {
 						if ((srv->cur_state != SRV_ST_STOPPED) ||
 						    (s->be->options & PR_O_PERSIST) ||
 						    (s->flags & SF_FORCE_PRST)) {
 							/* we found the server and we can use it */
 							txn->flags &= ~TX_CK_MASK;
 							txn->flags |= (srv->cur_state != SRV_ST_STOPPED) ? TX_CK_VALID : TX_CK_DOWN;
 							s->flags |= SF_DIRECT | SF_ASSIGNED;
 							s->target = &srv->obj_type;
 							break;
 						} else {
 							/* we found a server, but it's down,
 							 * mark it as such and go on in case
 							 * another one is available.
 							 */
 							txn->flags &= ~TX_CK_MASK;
 							txn->flags |= TX_CK_DOWN;
 						}
 					}
 					srv = srv->next;
 				}

 				if (!srv && !(txn->flags & (TX_CK_DOWN|TX_CK_EXPIRED|TX_CK_OLD))) {
 					/* no server matched this cookie or we deliberately skipped it */
 					txn->flags &= ~TX_CK_MASK;
 					if ((s->flags & (SF_IGNORE_PRST | SF_ASSIGNED)))
 						txn->flags |= TX_CK_UNUSED;
 					else
 						txn->flags |= TX_CK_INVALID;
 				}

 				/* depending on the cookie mode, we may have to either :
 				 * - delete the complete cookie if we're in insert+indirect mode, so that
 				 *   the server never sees it ;
 				 * - remove the server id from the cookie value, and tag the cookie as an
 				 *   application cookie so that it does not get accidentally removed later,
 				 *   if we're in cookie prefix mode
 				 */
 				if ((s->be->ck_opts & PR_CK_PFX) && (delim != val_end)) {
 					int delta; /* negative */

 					memmove(val_beg, delim + 1, hdr_end - (delim + 1));
 					delta = val_beg - (delim + 1);
 					val_end  += delta;
 					next     += delta;
 					hdr_end  += delta;
 					del_from = NULL;
 					preserve_hdr = 1; /* we want to keep this cookie */
 				}
 				else if (del_from == NULL &&
 					 (s->be->ck_opts & (PR_CK_INS | PR_CK_IND)) == (PR_CK_INS | PR_CK_IND)) {
 					del_from = prev;
 				}
 			}
 			else {
 				/* This is not our cookie, so we must preserve it. But if we already
 				 * scheduled another cookie for removal, we cannot remove the
 				 * complete header, but we can remove the previous block itself.
 				 */
 				preserve_hdr = 1;

 				if (del_from != NULL) {
 					int delta = http_del_hdr_value(hdr_beg, hdr_end, &del_from, prev);
 					if (att_beg >= del_from)
 						att_beg += delta;
 					if (att_end >= del_from)
 						att_end += delta;
 					val_beg  += delta;
 					val_end  += delta;
 					next     += delta;
 					hdr_end  += delta;
 					prev     = del_from;
 					del_from = NULL;
 				}
 			}

 			/* continue with next cookie on this header line */
 			att_beg = next;
 		} /* for each cookie */


 		/* There are no more cookies on this line.
 		 * We may still have one (or several) marked for deletion at the
 		 * end of the line. We must do this now in two ways :
 		 *  - if some cookies must be preserved, we only delete from the
 		 *    mark to the end of line ;
 		 *  - if nothing needs to be preserved, simply delete the whole header
 		 */
 		if (del_from) {
 			hdr_end = (preserve_hdr ? del_from : hdr_beg);
 		}
 		if ((hdr_end - hdr_beg) != ctx.value.len) {
 			if (hdr_beg != hdr_end)
 				htx_change_blk_value_len(htx, ctx.blk, hdr_end - hdr_beg);
 			else
 				http_remove_header(htx, &ctx);
 		}
 	} /* for each "Cookie header */
 }

 /*
  * Manage server-side cookies. It can impact performance by about 2% so it is
  * desirable to call it only when needed. This function is also used when we
  * just need to know if there is a cookie (eg: for check-cache).
  */
 static void http_manage_server_side_cookies(struct stream *s, struct channel *res)
 {
 	struct session *sess = s->sess;
 	struct http_txn *txn = s->txn;
 	struct htx *htx;
 	struct http_hdr_ctx ctx;
 	struct server *srv;
 	char *hdr_beg, *hdr_end;
 	char *prev, *att_beg, *att_end, *equal, *val_beg, *val_end, *next;
 	int is_cookie2 = 0;

 	htx = htxbuf(&res->buf);

 	ctx.blk = NULL;
 	while (1) {
 		int is_first = 1;

 		if (!http_find_header(htx, ist("Set-Cookie"), &ctx, 1)) {
 			if (!http_find_header(htx, ist("Set-Cookie2"), &ctx, 1))
 				break;
 			is_cookie2 = 1;
 		}

 		/* OK, right now we know we have a Set-Cookie* at hdr_beg, and
 		 * <prev> points to the colon.
 		 */
 		txn->flags |= TX_SCK_PRESENT;

 		/* Maybe we only wanted to see if there was a Set-Cookie (eg:
 		 * check-cache is enabled) and we are not interested in checking
 		 * them. Warning, the cookie capture is declared in the frontend.
 		 */
 		if (s->be->cookie_name == NULL && sess->fe->capture_name == NULL)
 			break;

 		/* OK so now we know we have to process this response cookie.
 		 * The format of the Set-Cookie header is slightly different
 		 * from the format of the Cookie header in that it does not
 		 * support the comma as a cookie delimiter (thus the header
 		 * cannot be folded) because the Expires attribute described in
 		 * the original Netscape's spec may contain an unquoted date
 		 * with a comma inside. We have to live with this because
 		 * many browsers don't support Max-Age and some browsers don't
 		 * support quoted strings. However the Set-Cookie2 header is
 		 * clean.
 		 *
 		 * We have to keep multiple pointers in order to support cookie
 		 * removal at the beginning, middle or end of header without
 		 * corrupting the header (in case of set-cookie2). A special
 		 * pointer, <scav> points to the beginning of the set-cookie-av
 		 * fields after the first semi-colon. The <next> pointer points
 		 * either to the end of line (set-cookie) or next unquoted comma
 		 * (set-cookie2). All of these headers are valid :
 		 *
 		 * hdr_beg                                                  hdr_end
 		 * |                                                           |
 		 * v                                                           |
 		 * NAME1  =  VALUE 1  ; Secure; Path="/"                       |
 		 * NAME=VALUE; Secure; Expires=Thu, 01-Jan-1970 00:00:01 GMT   v
 		 * NAME = VALUE ; Secure; Expires=Thu, 01-Jan-1970 00:00:01 GMT
 		 * NAME1 = VALUE 1 ; Max-Age=0, NAME2=VALUE2; Discard
 		 * | |   | | |     | |          |
 		 * | |   | | |     | |          +-> next
 		 * | |   | | |     | +------------> scav
 		 * | |   | | |     +--------------> val_end
 		 * | |   | | +--------------------> val_beg
 		 * | |   | +----------------------> equal
 		 * | |   +------------------------> att_end
 		 * | +----------------------------> att_beg
 		 * +------------------------------> prev
 		 * -------------------------------> hdr_beg
 		 */
 		hdr_beg = ctx.value.ptr;
 		hdr_end = hdr_beg + ctx.value.len;
 		for (prev = hdr_beg; prev < hdr_end; prev = next) {

 			/* Iterate through all cookies on this line */

 			/* find att_beg */
 			att_beg = prev;
 			if (!is_first)
 				att_beg++;
 			is_first = 0;

 			while (att_beg < hdr_end && HTTP_IS_SPHT(*att_beg))
 				att_beg++;

 			/* find att_end : this is the first character after the last non
 			 * space before the equal. It may be equal to hdr_end.
 			 */
 			equal = att_end = att_beg;

 			while (equal < hdr_end) {
 				if (*equal == '=' || *equal == ';' || (is_cookie2 && *equal == ','))
 					break;
 				if (HTTP_IS_SPHT(*equal++))
 					continue;
 				att_end = equal;
 			}

 			/* here, <equal> points to '=', a delimitor or the end. <att_end>
 			 * is between <att_beg> and <equal>, both may be identical.
 			 */

 			/* look for end of cookie if there is an equal sign */
 			if (equal < hdr_end && *equal == '=') {
 				/* look for the beginning of the value */
 				val_beg = equal + 1;
 				while (val_beg < hdr_end && HTTP_IS_SPHT(*val_beg))
 					val_beg++;

 				/* find the end of the value, respecting quotes */
 				next = http_find_cookie_value_end(val_beg, hdr_end);

 				/* make val_end point to the first white space or delimitor after the value */
 				val_end = next;
 				while (val_end > val_beg && HTTP_IS_SPHT(*(val_end - 1)))
 					val_end--;
 			}
 			else {
 				/* <equal> points to next comma, semi-colon or EOL */
 				val_beg = val_end = next = equal;
 			}

 			if (next < hdr_end) {
 				/* Set-Cookie2 supports multiple cookies, and <next> points to
 				 * a colon or semi-colon before the end. So skip all attr-value
 				 * pairs and look for the next comma. For Set-Cookie, since
 				 * commas are permitted in values, skip to the end.
 				 */
 				if (is_cookie2)
 					next = http_find_hdr_value_end(next, hdr_end);
 				else
 					next = hdr_end;
 			}

 			/* Now everything is as on the diagram above */

 			/* Ignore cookies with no equal sign */
 			if (equal == val_end)
 				continue;

 			/* If there are spaces around the equal sign, we need to
 			 * strip them otherwise we'll get trouble for cookie captures,
 			 * or even for rewrites. Since this happens extremely rarely,
 			 * it does not hurt performance.
 			 */
 			if (unlikely(att_end != equal || val_beg > equal + 1)) {
 				int stripped_before = 0;
 				int stripped_after = 0;

 				if (att_end != equal) {
 					memmove(att_end, equal, hdr_end - equal);
 					stripped_before = (att_end - equal);
 					equal   += stripped_before;
 					val_beg += stripped_before;
 				}

 				if (val_beg > equal + 1) {
 					memmove(equal + 1, val_beg, hdr_end + stripped_before - val_beg);
 					stripped_after = (equal + 1) - val_beg;
 					val_beg += stripped_after;
 					stripped_before += stripped_after;
 				}

 				val_end      += stripped_before;
 				next         += stripped_before;
 				hdr_end      += stripped_before;

 				htx_change_blk_value_len(htx, ctx.blk, hdr_end - hdr_beg);
 				ctx.value.len = hdr_end - hdr_beg;
 			}

 			/* First, let's see if we want to capture this cookie. We check
 			 * that we don't already have a server side cookie, because we
 			 * can only capture one. Also as an optimisation, we ignore
 			 * cookies shorter than the declared name.
 			 */
 			if (sess->fe->capture_name != NULL &&
 			    txn->srv_cookie == NULL &&
 			    (val_end - att_beg >= sess->fe->capture_namelen) &&
 			    memcmp(att_beg, sess->fe->capture_name, sess->fe->capture_namelen) == 0) {
 				int log_len = val_end - att_beg;
 				if ((txn->srv_cookie = pool_alloc(pool_head_capture)) == NULL) {
 					ha_alert("HTTP logging : out of memory.\n");
 				}
 				else {
 					if (log_len > sess->fe->capture_len)
 						log_len = sess->fe->capture_len;
 					memcpy(txn->srv_cookie, att_beg, log_len);
 					txn->srv_cookie[log_len] = 0;
 				}
 			}

 			srv = objt_server(s->target);
 			/* now check if we need to process it for persistence */
 			if (!(s->flags & SF_IGNORE_PRST) &&
 			    (att_end - att_beg == s->be->cookie_len) && (s->be->cookie_name != NULL) &&
 			    (memcmp(att_beg, s->be->cookie_name, att_end - att_beg) == 0)) {
 				/* assume passive cookie by default */
 				txn->flags &= ~TX_SCK_MASK;
 				txn->flags |= TX_SCK_FOUND;

 				/* If the cookie is in insert mode on a known server, we'll delete
 				 * this occurrence because we'll insert another one later.
 				 * We'll delete it too if the "indirect" option is set and we're in
 				 * a direct access.
 				 */
 				if (s->be->ck_opts & PR_CK_PSV) {
 					/* The "preserve" flag was set, we don't want to touch the
 					 * server's cookie.
 					 */
 				}
 				else if ((srv && (s->be->ck_opts & PR_CK_INS)) ||
 				    ((s->flags & SF_DIRECT) && (s->be->ck_opts & PR_CK_IND))) {
 					/* this cookie must be deleted */
 					if (prev == hdr_beg && next == hdr_end) {
 						/* whole header */
 						http_remove_header(htx, &ctx);
 						/* note: while both invalid now, <next> and <hdr_end>
 						 * are still equal, so the for() will stop as expected.
 						 */
 					} else {
 						/* just remove the value */
 						int delta = http_del_hdr_value(hdr_beg, hdr_end, &prev, next);
 						next      = prev;
 						hdr_end  += delta;
 					}
 					txn->flags &= ~TX_SCK_MASK;
 					txn->flags |= TX_SCK_DELETED;
 					/* and go on with next cookie */
 				}
 				else if (srv && srv->cookie && (s->be->ck_opts & PR_CK_RW)) {
 					/* replace bytes val_beg->val_end with the cookie name associated
 					 * with this server since we know it.
 					 */
 					int sliding, delta;

 					ctx.value = ist2(val_beg, val_end - val_beg);
 				        ctx.lws_before = ctx.lws_after = 0;
 					http_replace_header_value(htx, &ctx, ist2(srv->cookie, srv->cklen));
 					delta     = srv->cklen - (val_end - val_beg);
 					sliding   = (ctx.value.ptr - val_beg);
 					hdr_beg  += sliding;
 					val_beg  += sliding;
 					next     += sliding + delta;
 					hdr_end  += sliding + delta;

 					txn->flags &= ~TX_SCK_MASK;
 					txn->flags |= TX_SCK_REPLACED;
 				}
 				else if (srv && srv->cookie && (s->be->ck_opts & PR_CK_PFX)) {
 					/* insert the cookie name associated with this server
 					 * before existing cookie, and insert a delimiter between them..
 					 */
 					int sliding, delta;
 					ctx.value = ist2(val_beg, 0);
 				        ctx.lws_before = ctx.lws_after = 0;
 					http_replace_header_value(htx, &ctx, ist2(srv->cookie, srv->cklen + 1));
 					delta     = srv->cklen + 1;
 					sliding   = (ctx.value.ptr - val_beg);
 					hdr_beg  += sliding;
 					val_beg  += sliding;
 					next     += sliding + delta;
 					hdr_end  += sliding + delta;

 					val_beg[srv->cklen] = COOKIE_DELIM;
 					txn->flags &= ~TX_SCK_MASK;
 					txn->flags |= TX_SCK_REPLACED;
 				}
 			}
 			/* that's done for this cookie, check the next one on the same
 			 * line when next != hdr_end (only if is_cookie2).
 			 */
 		}
 	}
 }

 /*
  * Parses the Cache-Control and Pragma request header fields to determine if
  * the request may be served from the cache and/or if it is cacheable. Updates
  * s->txn->flags.
  */
 void http_check_request_for_cacheability(struct stream *s, struct channel *req)
 {
 	struct http_txn *txn = s->txn;
 	struct htx *htx;
         int32_t pos;
 	int pragma_found, cc_found, i;

 	if ((txn->flags & (TX_CACHEABLE|TX_CACHE_IGNORE)) == TX_CACHE_IGNORE)
 		return; /* nothing more to do here */

 	htx = htxbuf(&req->buf);
 	pragma_found = cc_found = 0;
 	for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
                 struct htx_blk *blk = htx_get_blk(htx, pos);
                 enum htx_blk_type type = htx_get_blk_type(blk);
 		struct ist n, v;

                 if (type == HTX_BLK_EOH)
                         break;
                 if (type != HTX_BLK_HDR)
                         continue;

 		n = htx_get_blk_name(htx, blk);
 		v = htx_get_blk_value(htx, blk);

 		if (isteq(n, ist("pragma"))) {
 			if (v.len >= 8 && strncasecmp(v.ptr, "no-cache", 8) == 0) {
 				pragma_found = 1;
 				continue;
 			}
 		}

 		/* Don't use the cache and don't try to store if we found the
 		 * Authorization header */
 		if (isteq(n, ist("authorization"))) {
 			txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
 			txn->flags |= TX_CACHE_IGNORE;
 			continue;
 		}

 		if (!isteq(n, ist("cache-control")))
 			continue;

 		/* OK, right now we know we have a cache-control header */
 		cc_found = 1;
 		if (!v.len)	/* no info */
 			continue;

 		i = 0;
 		while (i < v.len && *(v.ptr+i) != '=' && *(v.ptr+i) != ',' &&
 		       !isspace((unsigned char)*(v.ptr+i)))
 			i++;

 		/* we have a complete value between v.ptr and (v.ptr+i). We don't check the
 		 * values after max-age, max-stale nor min-fresh, we simply don't
 		 * use the cache when they're specified.
 		 */
 		if (((i == 7) && strncasecmp(v.ptr, "max-age",   7) == 0) ||
 		    ((i == 8) && strncasecmp(v.ptr, "no-cache",  8) == 0) ||
 		    ((i == 9) && strncasecmp(v.ptr, "max-stale", 9) == 0) ||
 		    ((i == 9) && strncasecmp(v.ptr, "min-fresh", 9) == 0)) {
 			txn->flags |= TX_CACHE_IGNORE;
 			continue;
 		}

 		if ((i == 8) && strncasecmp(v.ptr, "no-store", 8) == 0) {
 			txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
 			continue;
 		}
 	}

 	/* RFC7234#5.4:
 	 *   When the Cache-Control header field is also present and
 	 *   understood in a request, Pragma is ignored.
 	 *   When the Cache-Control header field is not present in a
 	 *   request, caches MUST consider the no-cache request
 	 *   pragma-directive as having the same effect as if
 	 *   "Cache-Control: no-cache" were present.
 	 */
 	if (!cc_found && pragma_found)
 		txn->flags |= TX_CACHE_IGNORE;
 }

 /*
  * Check if response is cacheable or not. Updates s->txn->flags.
  */
 void http_check_response_for_cacheability(struct stream *s, struct channel *res)
 {
 	struct http_txn *txn = s->txn;
 	struct htx *htx;
         int32_t pos;
 	int i;

 	if (txn->status < 200) {
 		/* do not try to cache interim responses! */
 		txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
 		return;
 	}

 	htx = htxbuf(&res->buf);
 	for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
                 struct htx_blk *blk  = htx_get_blk(htx, pos);
                 enum htx_blk_type type = htx_get_blk_type(blk);
 		struct ist n, v;

                 if (type == HTX_BLK_EOH)
                         break;
                 if (type != HTX_BLK_HDR)
                         continue;

 		n = htx_get_blk_name(htx, blk);
 		v = htx_get_blk_value(htx, blk);

 		if (isteq(n, ist("pragma"))) {
 			if ((v.len >= 8) && strncasecmp(v.ptr, "no-cache", 8) == 0) {
 				txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
 				return;
 			}
 		}

 		if (!isteq(n, ist("cache-control")))
 			continue;

 		/* OK, right now we know we have a cache-control header */
 		if (!v.len)	/* no info */
 			continue;

 		i = 0;
 		while (i < v.len && *(v.ptr+i) != '=' && *(v.ptr+i) != ',' &&
 		       !isspace((unsigned char)*(v.ptr+i)))
 			i++;

 		/* we have a complete value between v.ptr and (v.ptr+i) */
 		if (i < v.len && *(v.ptr + i) == '=') {
 			if (((v.len - i) > 1 && (i == 7) && strncasecmp(v.ptr, "max-age=0", 9) == 0) ||
 			    ((v.len - i) > 1 && (i == 8) && strncasecmp(v.ptr, "s-maxage=0", 10) == 0)) {
 				txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
 				continue;
 			}

 			/* we have something of the form no-cache="set-cookie" */
 			if ((v.len >= 21) &&
 			    strncasecmp(v.ptr, "no-cache=\"set-cookie", 20) == 0
 			    && (*(v.ptr + 20) == '"' || *(v.ptr + 20 ) == ','))
 				txn->flags &= ~TX_CACHE_COOK;
 			continue;
 		}

 		/* OK, so we know that either p2 points to the end of string or to a comma */
 		if (((i ==  7) && strncasecmp(v.ptr, "private", 7) == 0) ||
 		    ((i ==  8) && strncasecmp(v.ptr, "no-cache", 8) == 0) ||
 		    ((i ==  8) && strncasecmp(v.ptr, "no-store", 8) == 0)) {
 			txn->flags &= ~TX_CACHEABLE & ~TX_CACHE_COOK;
 			return;
 		}

 		if ((i ==  6) && strncasecmp(v.ptr, "public", 6) == 0) {
 			txn->flags |= TX_CACHEABLE | TX_CACHE_COOK;
 			continue;
 		}
 	}
 }

 /*
  * In a GET, HEAD or POST request, check if the requested URI matches the stats uri
  * for the current backend.
  *
  * It is assumed that the request is either a HEAD, GET, or POST and that the
  * uri_auth field is valid.
  *
  * Returns 1 if stats should be provided, otherwise 0.
  */
 static int http_stats_check_uri(struct stream *s, struct http_txn *txn, struct proxy *backend)
 {
 	struct uri_auth *uri_auth = backend->uri_auth;
 	struct htx *htx;
 	struct htx_sl *sl;
 	struct ist uri;

 	if (!uri_auth)
 		return 0;

 	if (txn->meth != HTTP_METH_GET && txn->meth != HTTP_METH_HEAD && txn->meth != HTTP_METH_POST)
 		return 0;

 	htx = htxbuf(&s->req.buf);
 	sl = http_get_stline(htx);
 	uri = htx_sl_req_uri(sl);
 	if (*uri_auth->uri_prefix == '/')
 		uri = http_get_path(uri);

 	/* check URI size */
 	if (uri_auth->uri_len > uri.len)
 		return 0;

 	if (memcmp(uri.ptr, uri_auth->uri_prefix, uri_auth->uri_len) != 0)
 		return 0;

 	return 1;
 }

 /* This function prepares an applet to handle the stats. It can deal with the
  * "100-continue" expectation, check that admin rules are met for POST requests,
  * and program a response message if something was unexpected. It cannot fail
  * and always relies on the stats applet to complete the job. It does not touch
  * analysers nor counters, which are left to the caller. It does not touch
  * s->target which is supposed to already point to the stats applet. The caller
  * is expected to have already assigned an appctx to the stream.
  */
 static int http_handle_stats(struct stream *s, struct channel *req)
 {
 	struct stats_admin_rule *stats_admin_rule;
 	struct stream_interface *si = &s->si[1];
 	struct session *sess = s->sess;
 	struct http_txn *txn = s->txn;
 	struct http_msg *msg = &txn->req;
 	struct uri_auth *uri_auth = s->be->uri_auth;
 	const char *h, *lookup, *end;
 	struct appctx *appctx;
 	struct htx *htx;
 	struct htx_sl *sl;

 	appctx = si_appctx(si);
 	memset(&appctx->ctx.stats, 0, sizeof(appctx->ctx.stats));
 	appctx->st1 = appctx->st2 = 0;
 	appctx->ctx.stats.st_code = STAT_STATUS_INIT;
 	appctx->ctx.stats.flags |= uri_auth->flags;
 	appctx->ctx.stats.flags |= STAT_FMT_HTML; /* assume HTML mode by default */
 	if ((msg->flags & HTTP_MSGF_VER_11) && (txn->meth != HTTP_METH_HEAD))
 		appctx->ctx.stats.flags |= STAT_CHUNKED;

 	htx = htxbuf(&req->buf);
 	sl = http_get_stline(htx);
 	lookup = HTX_SL_REQ_UPTR(sl) + uri_auth->uri_len;
 	end = HTX_SL_REQ_UPTR(sl) + HTX_SL_REQ_ULEN(sl);

 	for (h = lookup; h <= end - 3; h++) {
 		if (memcmp(h, ";up", 3) == 0) {
 			appctx->ctx.stats.flags |= STAT_HIDE_DOWN;
 			break;
 		}
 	}

 	if (uri_auth->refresh) {
 		for (h = lookup; h <= end - 10; h++) {
 			if (memcmp(h, ";norefresh", 10) == 0) {
 				appctx->ctx.stats.flags |= STAT_NO_REFRESH;
 				break;
 			}
 		}
 	}

 	for (h = lookup; h <= end - 4; h++) {
 		if (memcmp(h, ";csv", 4) == 0) {
 			appctx->ctx.stats.flags &= ~(STAT_FMT_MASK|STAT_JSON_SCHM);
 			break;
 		}
 	}

 	for (h = lookup; h <= end - 6; h++) {
 		if (memcmp(h, ";typed", 6) == 0) {
 			appctx->ctx.stats.flags &= ~(STAT_FMT_MASK|STAT_JSON_SCHM);
 			appctx->ctx.stats.flags |= STAT_FMT_TYPED;
 			break;
 		}
 	}

 	for (h = lookup; h <= end - 5; h++) {
 		if (memcmp(h, ";json", 5) == 0) {
 			appctx->ctx.stats.flags &= ~(STAT_FMT_MASK|STAT_JSON_SCHM);
 			appctx->ctx.stats.flags |= STAT_FMT_JSON;
 			break;
 		}
 	}

 	for (h = lookup; h <= end - 12; h++) {
 		if (memcmp(h, ";json-schema", 12) == 0) {
 			appctx->ctx.stats.flags &= ~STAT_FMT_MASK;
 			appctx->ctx.stats.flags |= STAT_JSON_SCHM;
 			break;
 		}
 	}

 	for (h = lookup; h <= end - 8; h++) {
 		if (memcmp(h, ";st=", 4) == 0) {
 			int i;
 			h += 4;
 			appctx->ctx.stats.st_code = STAT_STATUS_UNKN;
 			for (i = STAT_STATUS_INIT + 1; i < STAT_STATUS_SIZE; i++) {
 				if (strncmp(stat_status_codes[i], h, 4) == 0) {
 					appctx->ctx.stats.st_code = i;
 					break;
 				}
 			}
 			break;
 		}
 	}

 	appctx->ctx.stats.scope_str = 0;
 	appctx->ctx.stats.scope_len = 0;
 	for (h = lookup; h <= end - 8; h++) {
 		if (memcmp(h, STAT_SCOPE_INPUT_NAME "=", strlen(STAT_SCOPE_INPUT_NAME) + 1) == 0) {
 			int itx = 0;
 			const char *h2;
 			char scope_txt[STAT_SCOPE_TXT_MAXLEN + 1];
 			const char *err;

 			h += strlen(STAT_SCOPE_INPUT_NAME) + 1;
 			h2 = h;
 			appctx->ctx.stats.scope_str = h2 - HTX_SL_REQ_UPTR(sl);
 			while (h < end) {
 				if (*h == ';' || *h == '&' || *h == ' ')
 					break;
 				itx++;
 				h++;
 			}

 			if (itx > STAT_SCOPE_TXT_MAXLEN)
 				itx = STAT_SCOPE_TXT_MAXLEN;
 			appctx->ctx.stats.scope_len = itx;

 			/* scope_txt = search query, appctx->ctx.stats.scope_len is always <= STAT_SCOPE_TXT_MAXLEN */
 			memcpy(scope_txt, h2, itx);
 			scope_txt[itx] = '\0';
 			err = invalid_char(scope_txt);
 			if (err) {
 				/* bad char in search text => clear scope */
 				appctx->ctx.stats.scope_str = 0;
 				appctx->ctx.stats.scope_len = 0;
 			}
 			break;
 		}
 	}

 	/* now check whether we have some admin rules for this request */
 	list_for_each_entry(stats_admin_rule, &uri_auth->admin_rules, list) {
 		int ret = 1;

 		if (stats_admin_rule->cond) {
 			ret = acl_exec_cond(stats_admin_rule->cond, s->be, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
 			ret = acl_pass(ret);
 			if (stats_admin_rule->cond->pol == ACL_COND_UNLESS)
 				ret = !ret;
 		}

 		if (ret) {
 			/* no rule, or the rule matches */
 			appctx->ctx.stats.flags |= STAT_ADMIN;
 			break;
 		}
 	}

 	if (txn->meth == HTTP_METH_GET || txn->meth == HTTP_METH_HEAD)
 		appctx->st0 = STAT_HTTP_HEAD;
 	else if (txn->meth == HTTP_METH_POST) {
 		if (appctx->ctx.stats.flags & STAT_ADMIN) {
 			appctx->st0 = STAT_HTTP_POST;
 			if (msg->msg_state < HTTP_MSG_DATA)
 				req->analysers |= AN_REQ_HTTP_BODY;
 		}
 		else {
 			/* POST without admin level */
 			appctx->ctx.stats.flags &= ~STAT_CHUNKED;
 			appctx->ctx.stats.st_code = STAT_STATUS_DENY;
 			appctx->st0 = STAT_HTTP_LAST;
 		}
 	}
 	else {
 		/* Unsupported method */
 		appctx->ctx.stats.flags &= ~STAT_CHUNKED;
 		appctx->ctx.stats.st_code = STAT_STATUS_IVAL;
 		appctx->st0 = STAT_HTTP_LAST;
 	}

 	s->task->nice = -32; /* small boost for HTTP statistics */
 	return 1;
 }

 void http_perform_server_redirect(struct stream *s, struct stream_interface *si)
 {
 	struct channel *req = &s->req;
 	struct channel *res = &s->res;
 	struct server *srv;
 	struct htx *htx;
 	struct htx_sl *sl;
 	struct ist path, location;
 	unsigned int flags;

 	/*
 	 * Create the location
 	 */
 	chunk_reset(&trash);

 	/* 1: add the server's prefix */
 	/* special prefix "/" means don't change URL */
 	srv = __objt_server(s->target);
 	if (srv->rdr_len != 1 || *srv->rdr_pfx != '/') {
 		if (!chunk_memcat(&trash, srv->rdr_pfx, srv->rdr_len))
 			return;
 	}

 	/* 2: add the request Path */
 	htx = htxbuf(&req->buf);
 	sl = http_get_stline(htx);
 	path = http_get_path(htx_sl_req_uri(sl));
 	if (!path.ptr)
 		return;

 	if (!chunk_memcat(&trash, path.ptr, path.len))
 		return;
 	location = ist2(trash.area, trash.data);

 	/*
 	 * Create the 302 respone
 	 */
 	htx = htx_from_buf(&res->buf);
 	flags = (HTX_SL_F_IS_RESP|HTX_SL_F_VER_11|HTX_SL_F_XFER_LEN|HTX_SL_F_BODYLESS);
 	sl = htx_add_stline(htx, HTX_BLK_RES_SL, flags,
 			    ist("HTTP/1.1"), ist("302"), ist("Found"));
 	if (!sl)
 		goto fail;
 	sl->info.res.status = 302;
 	s->txn->status = 302;

         if (!htx_add_header(htx, ist("Cache-Control"), ist("no-cache")) ||
 	    !htx_add_header(htx, ist("Connection"), ist("close")) ||
 	    !htx_add_header(htx, ist("Content-length"), ist("0")) ||
 	    !htx_add_header(htx, ist("Location"), location))
 		goto fail;

 	if (!htx_add_endof(htx, HTX_BLK_EOH) || !htx_add_endof(htx, HTX_BLK_EOM))
 		goto fail;

 	htx_to_buf(htx, &res->buf);
 	if (!http_forward_proxy_resp(s, 1))
 		goto fail;

 	/* return without error. */
 	si_shutr(si);
 	si_shutw(si);
 	si->err_type = SI_ET_NONE;
 	si->state    = SI_ST_CLO;

 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= SF_ERR_LOCAL;
 	if (!(s->flags & SF_FINST_MASK))
 		s->flags |= SF_FINST_C;

 	/* FIXME: we should increase a counter of redirects per server and per backend. */
 	srv_inc_sess_ctr(srv);
 	srv_set_sess_last(srv);
 	return;

   fail:
 	/* If an error occurred, remove the incomplete HTTP response from the
 	 * buffer */
 	channel_htx_truncate(res, htx);
 }

 /* This function terminates the request because it was completly analyzed or
  * because an error was triggered during the body forwarding.
  */
 static void http_end_request(struct stream *s)
 {
 	struct channel *chn = &s->req;
 	struct http_txn *txn = s->txn;

 	DBG_TRACE_ENTER(STRM_EV_HTTP_ANA, s, txn);

 	if (unlikely(txn->req.msg_state == HTTP_MSG_ERROR ||
 		     txn->rsp.msg_state == HTTP_MSG_ERROR)) {
 		channel_abort(chn);
 		channel_htx_truncate(chn, htxbuf(&chn->buf));
 		goto end;
 	}

 	if (unlikely(txn->req.msg_state < HTTP_MSG_DONE)) {
 		DBG_TRACE_DEVEL("waiting end of the request", STRM_EV_HTTP_ANA, s, txn);
 		return;
 	}

 	if (txn->req.msg_state == HTTP_MSG_DONE) {
 		/* No need to read anymore, the request was completely parsed.
 		 * We can shut the read side unless we want to abort_on_close,
 		 * or we have a POST request. The issue with POST requests is
 		 * that some browsers still send a CRLF after the request, and
 		 * this CRLF must be read so that it does not remain in the kernel
 		 * buffers, otherwise a close could cause an RST on some systems
 		 * (eg: Linux).
 		 */
 		if (!(s->be->options & PR_O_ABRT_CLOSE) && txn->meth != HTTP_METH_POST)
 			channel_dont_read(chn);

 		/* if the server closes the connection, we want to immediately react
 		 * and close the socket to save packets and syscalls.
 		 */
 		s->si[1].flags |= SI_FL_NOHALF;

 		/* In any case we've finished parsing the request so we must
 		 * disable Nagle when sending data because 1) we're not going
 		 * to shut this side, and 2) the server is waiting for us to
 		 * send pending data.
 		 */
 		chn->flags |= CF_NEVER_WAIT;

 		if (txn->rsp.msg_state < HTTP_MSG_DONE) {
 			/* The server has not finished to respond, so we
 			 * don't want to move in order not to upset it.
 			 */
 			DBG_TRACE_DEVEL("waiting end of the response", STRM_EV_HTTP_ANA, s, txn);
 			return;
 		}

 		/* When we get here, it means that both the request and the
 		 * response have finished receiving. Depending on the connection
 		 * mode, we'll have to wait for the last bytes to leave in either
 		 * direction, and sometimes for a close to be effective.
 		 */
 		if (txn->flags & TX_CON_WANT_TUN) {
 			/* Tunnel mode will not have any analyser so it needs to
 			 * poll for reads.
 			 */
 			channel_auto_read(chn);
 			if (b_data(&chn->buf)) {
 				DBG_TRACE_DEVEL("waiting to flush the request", STRM_EV_HTTP_ANA, s, txn);
 				return;
 			}
 			txn->req.msg_state = HTTP_MSG_TUNNEL;
 		}
 		else {
 			/* we're not expecting any new data to come for this
 			 * transaction, so we can close it.
 			 *
 			 *  However, there is an exception if the response
 			 *  length is undefined. In this case, we need to wait
 			 *  the close from the server. The response will be
 			 *  switched in TUNNEL mode until the end.
 			 */
 			if (!(txn->rsp.flags & HTTP_MSGF_XFER_LEN) &&
 			    txn->rsp.msg_state != HTTP_MSG_CLOSED)
 				goto check_channel_flags;

 			if (!(chn->flags & (CF_SHUTW|CF_SHUTW_NOW))) {
 				channel_shutr_now(chn);
 				channel_shutw_now(chn);
 			}
 		}
 		goto check_channel_flags;
 	}

 	if (txn->req.msg_state == HTTP_MSG_CLOSING) {
 	  http_msg_closing:
 		/* nothing else to forward, just waiting for the output buffer
 		 * to be empty and for the shutw_now to take effect.
 		 */
 		if (channel_is_empty(chn)) {
 			txn->req.msg_state = HTTP_MSG_CLOSED;
 			goto http_msg_closed;
 		}
 		else if (chn->flags & CF_SHUTW) {
 			txn->req.msg_state = HTTP_MSG_ERROR;
 			goto end;
 		}
 		DBG_TRACE_LEAVE(STRM_EV_HTTP_ANA, s, txn);
 		return;
 	}

 	if (txn->req.msg_state == HTTP_MSG_CLOSED) {
 	  http_msg_closed:
 		/* if we don't know whether the server will close, we need to hard close */
 		if (txn->rsp.flags & HTTP_MSGF_XFER_LEN)
 			s->si[1].flags |= SI_FL_NOLINGER;  /* we want to close ASAP */
 		/* see above in MSG_DONE why we only do this in these states */
 		if (!(s->be->options & PR_O_ABRT_CLOSE))
 			channel_dont_read(chn);
 		goto end;
 	}

   check_channel_flags:
 	/* Here, we are in HTTP_MSG_DONE or HTTP_MSG_TUNNEL */
 	if (chn->flags & (CF_SHUTW|CF_SHUTW_NOW)) {
 		/* if we've just closed an output, let's switch */
 		txn->req.msg_state = HTTP_MSG_CLOSING;
 		goto http_msg_closing;
 	}

   end:
 	chn->analysers &= AN_REQ_FLT_END;
 	if (txn->req.msg_state == HTTP_MSG_TUNNEL && HAS_REQ_DATA_FILTERS(s))
 			chn->analysers |= AN_REQ_FLT_XFER_DATA;
 	channel_auto_close(chn);
 	channel_auto_read(chn);
 	DBG_TRACE_LEAVE(STRM_EV_HTTP_ANA, s, txn);
 }


 /* This function terminates the response because it was completly analyzed or
  * because an error was triggered during the body forwarding.
  */
 static void http_end_response(struct stream *s)
 {
 	struct channel *chn = &s->res;
 	struct http_txn *txn = s->txn;

 	DBG_TRACE_ENTER(STRM_EV_HTTP_ANA, s, txn);

 	if (unlikely(txn->req.msg_state == HTTP_MSG_ERROR ||
 		     txn->rsp.msg_state == HTTP_MSG_ERROR)) {
 		channel_htx_truncate(&s->req, htxbuf(&s->req.buf));
 		channel_abort(&s->req);
 		goto end;
 	}

 	if (unlikely(txn->rsp.msg_state < HTTP_MSG_DONE)) {
 		DBG_TRACE_DEVEL("waiting end of the response", STRM_EV_HTTP_ANA, s, txn);
 		return;
 	}

 	if (txn->rsp.msg_state == HTTP_MSG_DONE) {
 		/* In theory, we don't need to read anymore, but we must
 		 * still monitor the server connection for a possible close
 		 * while the request is being uploaded, so we don't disable
 		 * reading.
 		 */
 		/* channel_dont_read(chn); */

 		if (txn->req.msg_state < HTTP_MSG_DONE) {
 			/* The client seems to still be sending data, probably
 			 * because we got an error response during an upload.
 			 * We have the choice of either breaking the connection
 			 * or letting it pass through. Let's do the later.
 			 */
 			DBG_TRACE_DEVEL("waiting end of the request", STRM_EV_HTTP_ANA, s, txn);
 			return;
 		}

 		/* When we get here, it means that both the request and the
 		 * response have finished receiving. Depending on the connection
 		 * mode, we'll have to wait for the last bytes to leave in either
 		 * direction, and sometimes for a close to be effective.
 		 */
 		if (txn->flags & TX_CON_WANT_TUN) {
 			channel_auto_read(chn);
 			chn->flags |= CF_NEVER_WAIT;
 			if (b_data(&chn->buf)) {
 				DBG_TRACE_DEVEL("waiting to flush the respone", STRM_EV_HTTP_ANA, s, txn);
 				return;
 			}
 			txn->rsp.msg_state = HTTP_MSG_TUNNEL;
 		}
 		else {
 			/* we're not expecting any new data to come for this
 			 * transaction, so we can close it.
 			 */
 			if (!(chn->flags & (CF_SHUTW|CF_SHUTW_NOW))) {
 				channel_shutr_now(chn);
 				channel_shutw_now(chn);
 			}
 		}
 		goto check_channel_flags;
 	}

 	if (txn->rsp.msg_state == HTTP_MSG_CLOSING) {
 	  http_msg_closing:
 		/* nothing else to forward, just waiting for the output buffer
 		 * to be empty and for the shutw_now to take effect.
 		 */
 		if (channel_is_empty(chn)) {
 			txn->rsp.msg_state = HTTP_MSG_CLOSED;
 			goto http_msg_closed;
 		}
 		else if (chn->flags & CF_SHUTW) {
 			txn->rsp.msg_state = HTTP_MSG_ERROR;
 			_HA_ATOMIC_ADD(&strm_sess(s)->fe->fe_counters.cli_aborts, 1);
 			_HA_ATOMIC_ADD(&s->be->be_counters.cli_aborts, 1);
 			if (strm_sess(s)->listener->counters)
 				_HA_ATOMIC_ADD(&strm_sess(s)->listener->counters->cli_aborts, 1);
 			if (objt_server(s->target))
 				_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.cli_aborts, 1);
 			goto end;
 		}
 		DBG_TRACE_LEAVE(STRM_EV_HTTP_ANA, s, txn);
 		return;
 	}

 	if (txn->rsp.msg_state == HTTP_MSG_CLOSED) {
 	  http_msg_closed:
 		/* drop any pending data */
 		channel_htx_truncate(&s->req, htxbuf(&s->req.buf));
 		channel_abort(&s->req);
 		goto end;
 	}

   check_channel_flags:
 	/* Here, we are in HTTP_MSG_DONE or HTTP_MSG_TUNNEL */
 	if (chn->flags & (CF_SHUTW|CF_SHUTW_NOW)) {
 		/* if we've just closed an output, let's switch */
 		txn->rsp.msg_state = HTTP_MSG_CLOSING;
 		goto http_msg_closing;
 	}

   end:
 	chn->analysers &= AN_RES_FLT_END;
 	if (txn->rsp.msg_state == HTTP_MSG_TUNNEL && HAS_RSP_DATA_FILTERS(s))
 		chn->analysers |= AN_RES_FLT_XFER_DATA;
 	channel_auto_close(chn);
 	channel_auto_read(chn);
 	DBG_TRACE_LEAVE(STRM_EV_HTTP_ANA, s, txn);
 }

 /* Forward a response generated by HAProxy (error/redirect/return). This
  * function forwards all pending incoming data. If <final> is set to 0, nothing
  * more is performed. It is used for 1xx informational messages. Otherwise, the
  * transaction is terminated and the request is emptied. On success 1 is
  * returned. If an error occurred, 0 is returned.
  */
 int http_forward_proxy_resp(struct stream *s, int final)
 {
 	struct channel *req = &s->req;
 	struct channel *res = &s->res;
 	struct htx *htx = htxbuf(&res->buf);
 	size_t data;

 	if (final) {
 		htx->flags |= HTX_FL_PROXY_RESP;
 		if (!http_eval_after_res_rules(s))
 			return 0;

 		channel_auto_read(req);
 		channel_abort(req);
 		channel_auto_close(req);
 		channel_htx_erase(req, htxbuf(&req->buf));

 		res->wex = tick_add_ifset(now_ms, res->wto);
 		channel_auto_read(res);
 		channel_auto_close(res);
 		channel_shutr_now(res);
 	}

 	data = htx->data - co_data(res);
 	c_adv(res, data);
 	htx->first = -1;
 	res->total += data;
 	return 1;
 }

 void http_server_error(struct stream *s, struct stream_interface *si, int err,
 		       int finst, const struct buffer *msg)
 {
 	http_reply_and_close(s, s->txn->status, msg);
 	if (!(s->flags & SF_ERR_MASK))
 		s->flags |= err;
 	if (!(s->flags & SF_FINST_MASK))
 		s->flags |= finst;
 }

 void http_reply_and_close(struct stream *s, short status, const struct buffer *msg)
 {
 	channel_auto_read(&s->req);
 	channel_abort(&s->req);
 	channel_auto_close(&s->req);
 	channel_htx_erase(&s->req, htxbuf(&s->req.buf));
 	channel_htx_truncate(&s->res, htxbuf(&s->res.buf));
 	channel_auto_read(&s->res);
 	channel_auto_close(&s->res);
 	channel_shutr_now(&s->res);

 	s->res.wex = tick_add_ifset(now_ms, s->res.wto);
 	s->txn->flags &= ~TX_WAIT_NEXT_RQ;

 	/* <msg> is an HTX structure. So we copy it in the response's
 	 * channel */
 	if (msg && !b_is_null(msg)) {
 		struct channel *chn = &s->res;
 		struct htx *htx;

 		FLT_STRM_CB(s, flt_http_reply(s, s->txn->status, msg));
 		htx = htx_from_buf(&chn->buf);
 		if (channel_htx_copy_msg(chn, htx, msg)) {
 			if (!http_forward_proxy_resp(s, 1) && s->txn->status != 500) {
 				s->txn->status = 500;
 				http_reply_and_close(s, s->txn->status, http_error_message(s));
 			}
 		}
 	}
 }

 struct buffer *http_error_message(struct stream *s)
 {
 	const int msgnum = http_get_status_idx(s->txn->status);

 	if (s->txn->errmsg)
 		return s->txn->errmsg;
 	else if (s->be->errmsg[msgnum])
 		return s->be->errmsg[msgnum];
 	else if (strm_fe(s)->errmsg[msgnum])
 		return strm_fe(s)->errmsg[msgnum];
 	else
 		return &http_err_chunks[msgnum];
 }

 /* Return the error message corresponding to si->err_type. It is assumed
  * that the server side is closed. Note that err_type is actually a
  * bitmask, where almost only aborts may be cumulated with other
  * values. We consider that aborted operations are more important
  * than timeouts or errors due to the fact that nobody else in the
  * logs might explain incomplete retries. All others should avoid
  * being cumulated. It should normally not be possible to have multiple
  * aborts at once, but just in case, the first one in sequence is reported.
  * Note that connection errors appearing on the second request of a keep-alive
  * connection are not reported since this allows the client to retry.
  */
 void http_return_srv_error(struct stream *s, struct stream_interface *si)
 {
 	int err_type = si->err_type;

 	/* set s->txn->status for http_error_message(s) */
 	s->txn->status = 503;

 	if (err_type & SI_ET_QUEUE_ABRT)
 		http_server_error(s, si, SF_ERR_CLICL, SF_FINST_Q,
 				  http_error_message(s));
 	else if (err_type & SI_ET_CONN_ABRT)
 		http_server_error(s, si, SF_ERR_CLICL, SF_FINST_C,
 				  (s->txn->flags & TX_NOT_FIRST) ? NULL :
 				  http_error_message(s));
 	else if (err_type & SI_ET_QUEUE_TO)
 		http_server_error(s, si, SF_ERR_SRVTO, SF_FINST_Q,
 				  http_error_message(s));
 	else if (err_type & SI_ET_QUEUE_ERR)
 		http_server_error(s, si, SF_ERR_SRVCL, SF_FINST_Q,
 				  http_error_message(s));
 	else if (err_type & SI_ET_CONN_TO)
 		http_server_error(s, si, SF_ERR_SRVTO, SF_FINST_C,
 				  (s->txn->flags & TX_NOT_FIRST) ? NULL :
 				  http_error_message(s));
 	else if (err_type & SI_ET_CONN_ERR)
 		http_server_error(s, si, SF_ERR_SRVCL, SF_FINST_C,
 				  (s->flags & SF_SRV_REUSED) ? NULL :
 				  http_error_message(s));
 	else if (err_type & SI_ET_CONN_RES)
 		http_server_error(s, si, SF_ERR_RESOURCE, SF_FINST_C,
 				  (s->txn->flags & TX_NOT_FIRST) ? NULL :
 				  http_error_message(s));
 	else { /* SI_ET_CONN_OTHER and others */
 		s->txn->status = 500;
 		http_server_error(s, si, SF_ERR_INTERNAL, SF_FINST_C,
 				  http_error_message(s));
 	}
 }


 /* Handle Expect: 100-continue for HTTP/1.1 messages if necessary. It returns 0
  * on success and -1 on error.
  */
 static int http_handle_expect_hdr(struct stream *s, struct htx *htx, struct http_msg *msg)
 {
 	/* If we have HTTP/1.1 message with a body and Expect: 100-continue,
 	 * then we must send an HTTP/1.1 100 Continue intermediate response.
 	 */
 	if (msg->msg_state == HTTP_MSG_BODY && (msg->flags & HTTP_MSGF_VER_11) &&
 	    (msg->flags & (HTTP_MSGF_CNT_LEN|HTTP_MSGF_TE_CHNK))) {
 		struct ist hdr = { .ptr = "Expect", .len = 6 };
 		struct http_hdr_ctx ctx;

 		ctx.blk = NULL;
 		/* Expect is allowed in 1.1, look for it */
 		if (http_find_header(htx, hdr, &ctx, 0) &&
 		    unlikely(isteqi(ctx.value, ist2("100-continue", 12)))) {
 			if (http_reply_100_continue(s) == -1)
 				return -1;
 			http_remove_header(htx, &ctx);
 		}
 	}
 	return 0;
 }

 /* Send a 100-Continue response to the client. It returns 0 on success and -1
  * on error. The response channel is updated accordingly.
  */
 static int http_reply_100_continue(struct stream *s)
 {
 	struct channel *res = &s->res;
 	struct htx *htx = htx_from_buf(&res->buf);
 	struct htx_sl *sl;
 	unsigned int flags = (HTX_SL_F_IS_RESP|HTX_SL_F_VER_11|
 			      HTX_SL_F_XFER_LEN|HTX_SL_F_BODYLESS);

 	sl = htx_add_stline(htx, HTX_BLK_RES_SL, flags,
 			    ist("HTTP/1.1"), ist("100"), ist("Continue"));
 	if (!sl)
 		goto fail;
 	sl->info.res.status = 100;

 	if (!htx_add_endof(htx, HTX_BLK_EOH))
 		goto fail;

 	if (!http_forward_proxy_resp(s, 0))
 		goto fail;
 	return 0;

   fail:
 	/* If an error occurred, remove the incomplete HTTP response from the
 	 * buffer */
 	channel_htx_truncate(res, htx);
 	return -1;
 }


 /* Send a 401-Unauthorized or 407-Unauthorized response to the client, depending
  * ont whether we use a proxy or not. It returns 0 on success and -1 on
  * error. The response channel is updated accordingly.
  */
 static int http_reply_40x_unauthorized(struct stream *s, const char *auth_realm)
 {
 	struct channel *res = &s->res;
 	struct htx *htx = htx_from_buf(&res->buf);
 	struct htx_sl *sl;
 	struct ist code, body;
 	int status;
 	unsigned int flags = (HTX_SL_F_IS_RESP|HTX_SL_F_VER_11);

 	if (!(s->txn->flags & TX_USE_PX_CONN)) {
 		status = 401;
 		code = ist("401");
 		body = ist("<html><body><h1>401 Unauthorized</h1>\n"
 			   "You need a valid user and password to access this content.\n"
 			   "</body></html>\n");
 	}
 	else {
 		status = 407;
 		code = ist("407");
 		body = ist("<html><body><h1>407 Unauthorized</h1>\n"
 			   "You need a valid user and password to access this content.\n"
 			   "</body></html>\n");
 	}

 	sl = htx_add_stline(htx, HTX_BLK_RES_SL, flags,
 			    ist("HTTP/1.1"), code, ist("Unauthorized"));
 	if (!sl)
 		goto fail;
 	sl->info.res.status = status;
 	s->txn->status = status;

 	if (chunk_printf(&trash, "Basic realm=\"%s\"", auth_realm) == -1)
 		goto fail;

         if (!htx_add_header(htx, ist("Content-length"), ist("112")) ||
 	    !htx_add_header(htx, ist("Cache-Control"), ist("no-cache")) ||
 	    !htx_add_header(htx, ist("Connection"), ist("close")) ||
 	    !htx_add_header(htx, ist("Content-Type"), ist("text/html")))
 		goto fail;
 	if (status == 401 && !htx_add_header(htx, ist("WWW-Authenticate"), ist2(trash.area, trash.data)))
 		goto fail;
 	if (status == 407 && !htx_add_header(htx, ist("Proxy-Authenticate"), ist2(trash.area, trash.data)))
 		goto fail;
 	if (!htx_add_endof(htx, HTX_BLK_EOH))
 		goto fail;

 	while (body.len) {
 		size_t sent = htx_add_data(htx, body);
 		if (!sent)
 			goto fail;
 		body.ptr += sent;
 		body.len -= sent;
 	}

 	if (!htx_add_endof(htx, HTX_BLK_EOM))
 		goto fail;

 	if (!http_forward_proxy_resp(s, 1))
 		goto fail;
 	return 0;

   fail:
 	/* If an error occurred, remove the incomplete HTTP response from the
 	 * buffer */
 	channel_htx_truncate(res, htx);
 	return -1;
 }

 /*
  * Capture headers from message <htx> according to header list <cap_hdr>, and
  * fill the <cap> pointers appropriately.
  */
 static void http_capture_headers(struct htx *htx, char **cap, struct cap_hdr *cap_hdr)
 {
 	struct cap_hdr *h;
 	int32_t pos;

 	for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
 		struct htx_blk *blk = htx_get_blk(htx, pos);
 		enum htx_blk_type type = htx_get_blk_type(blk);
 		struct ist n, v;

 		if (type == HTX_BLK_EOH)
 			break;
 		if (type != HTX_BLK_HDR)
 			continue;

 		n = htx_get_blk_name(htx, blk);

 		for (h = cap_hdr; h; h = h->next) {
 			if (h->namelen && (h->namelen == n.len) &&
 			    (strncasecmp(n.ptr, h->name, h->namelen) == 0)) {
 				if (cap[h->index] == NULL)
 					cap[h->index] =
 						pool_alloc(h->pool);

 				if (cap[h->index] == NULL) {
 					ha_alert("HTTP capture : out of memory.\n");
 					break;
 				}

 				v = htx_get_blk_value(htx, blk);
 				if (v.len > h->len)
 					v.len = h->len;

 				memcpy(cap[h->index], v.ptr, v.len);
 				cap[h->index][v.len]=0;
 			}
 		}
 	}
 }

 /* Delete a value in a header between delimiters <from> and <next>. The header
  * itself is delimited by <start> and <end> pointers. The number of characters
  * displaced is returned, and the pointer to the first delimiter is updated if
  * required. The function tries as much as possible to respect the following
  * principles :
  * - replace <from> delimiter by the <next> one unless <from> points to <start>,
  *   in which case <next> is simply removed
  * - set exactly one space character after the new first delimiter, unless there
  *   are not enough characters in the block being moved to do so.
  * - remove unneeded spaces before the previous delimiter and after the new
  *   one.
  *
  * It is the caller's responsibility to ensure that :
  *   - <from> points to a valid delimiter or <start> ;
  *   - <next> points to a valid delimiter or <end> ;
  *   - there are non-space chars before <from>.
  */
 static int http_del_hdr_value(char *start, char *end, char **from, char *next)
 {
 	char *prev = *from;

 	if (prev == start) {
 		/* We're removing the first value. eat the semicolon, if <next>
 		 * is lower than <end> */
 		if (next < end)
 			next++;

 		while (next < end && HTTP_IS_SPHT(*next))
 			next++;
 	}
 	else {
 		/* Remove useless spaces before the old delimiter. */
 		while (HTTP_IS_SPHT(*(prev-1)))
 			prev--;
 		*from = prev;

 		/* copy the delimiter and if possible a space if we're
 		 * not at the end of the line.
 		 */
 		if (next < end) {
 			*prev++ = *next++;
 			if (prev + 1 < next)
 				*prev++ = ' ';
 			while (next < end && HTTP_IS_SPHT(*next))
 				next++;
 		}
 	}
 	memmove(prev, next, end - next);
 	return (prev - next);
 }


 /* Formats the start line of the request (without CRLF) and puts it in <str> and
  * return the written length. The line can be truncated if it exceeds <len>.
  */
 static size_t http_fmt_req_line(const struct htx_sl *sl, char *str, size_t len)
 {
 	struct ist dst = ist2(str, 0);

 	if (istcat(&dst, htx_sl_req_meth(sl), len) == -1)
 		goto end;
 	if (dst.len + 1 > len)
 		goto end;
 	dst.ptr[dst.len++] = ' ';

 	if (istcat(&dst, htx_sl_req_uri(sl), len) == -1)
 		goto end;
 	if (dst.len + 1 > len)
 		goto end;
 	dst.ptr[dst.len++] = ' ';

 	istcat(&dst, htx_sl_req_vsn(sl), len);
   end:
 	return dst.len;
 }

 /*
  * Print a debug line with a start line.
  */
 static void http_debug_stline(const char *dir, struct stream *s, const struct htx_sl *sl)
 {
         struct session *sess = strm_sess(s);
         int max;

         chunk_printf(&trash, "%08x:%s.%s[%04x:%04x]: ", s->uniq_id, s->be->id,
                      dir,
                      objt_conn(sess->origin) ? (unsigned short)objt_conn(sess->origin)->handle.fd : -1,
                      objt_cs(s->si[1].end) ? (unsigned short)objt_cs(s->si[1].end)->conn->handle.fd : -1);

         max = HTX_SL_P1_LEN(sl);
         UBOUND(max, trash.size - trash.data - 3);
         chunk_memcat(&trash, HTX_SL_P1_PTR(sl), max);
         trash.area[trash.data++] = ' ';

         max = HTX_SL_P2_LEN(sl);
         UBOUND(max, trash.size - trash.data - 2);
         chunk_memcat(&trash, HTX_SL_P2_PTR(sl), max);
         trash.area[trash.data++] = ' ';

         max = HTX_SL_P3_LEN(sl);
         UBOUND(max, trash.size - trash.data - 1);
         chunk_memcat(&trash, HTX_SL_P3_PTR(sl), max);
         trash.area[trash.data++] = '\n';

         shut_your_big_mouth_gcc(write(1, trash.area, trash.data));
 }

 /*
  * Print a debug line with a header.
  */
 static void http_debug_hdr(const char *dir, struct stream *s, const struct ist n, const struct ist v)
 {
         struct session *sess = strm_sess(s);
         int max;

         chunk_printf(&trash, "%08x:%s.%s[%04x:%04x]: ", s->uniq_id, s->be->id,
                      dir,
                      objt_conn(sess->origin) ? (unsigned short)objt_conn(sess->origin)->handle.fd : -1,
                      objt_cs(s->si[1].end) ? (unsigned short)objt_cs(s->si[1].end)->conn->handle.fd : -1);

         max = n.len;
         UBOUND(max, trash.size - trash.data - 3);
         chunk_memcat(&trash, n.ptr, max);
         trash.area[trash.data++] = ':';
         trash.area[trash.data++] = ' ';

         max = v.len;
         UBOUND(max, trash.size - trash.data - 1);
         chunk_memcat(&trash, v.ptr, max);
         trash.area[trash.data++] = '\n';

         shut_your_big_mouth_gcc(write(1, trash.area, trash.data));
 }

 /* Allocate a new HTTP transaction for stream <s> unless there is one already.
  * In case of allocation failure, everything allocated is freed and NULL is
  * returned. Otherwise the new transaction is assigned to the stream and
  * returned.
  */
 struct http_txn *http_alloc_txn(struct stream *s)
 {
 	struct http_txn *txn = s->txn;

 	if (txn)
 		return txn;

 	txn = pool_alloc(pool_head_http_txn);
 	if (!txn)
 		return txn;

 	s->txn = txn;
 	return txn;
 }

 void http_txn_reset_req(struct http_txn *txn)
 {
 	txn->req.flags = 0;
 	txn->req.msg_state = HTTP_MSG_RQBEFORE; /* at the very beginning of the request */
 }

 void http_txn_reset_res(struct http_txn *txn)
 {
 	txn->rsp.flags = 0;
 	txn->rsp.msg_state = HTTP_MSG_RPBEFORE; /* at the very beginning of the response */
 }

 /*
  * Initialize a new HTTP transaction for stream <s>. It is assumed that all
  * the required fields are properly allocated and that we only need to (re)init
  * them. This should be used before processing any new request.
  */
 void http_init_txn(struct stream *s)
 {
 	struct http_txn *txn = s->txn;
 	struct conn_stream *cs = objt_cs(s->si[0].end);

 	txn->flags = ((cs && cs->flags & CS_FL_NOT_FIRST)
 		      ? (TX_NOT_FIRST|TX_WAIT_NEXT_RQ)
 		      : 0);
 	txn->status = -1;
 	txn->errmsg = NULL;
 	*(unsigned int *)txn->cache_hash = 0;

 	txn->cookie_first_date = 0;
 	txn->cookie_last_date = 0;

 	txn->srv_cookie = NULL;
 	txn->cli_cookie = NULL;
 	txn->uri = NULL;

 	http_txn_reset_req(txn);
 	http_txn_reset_res(txn);

 	txn->req.chn = &s->req;
 	txn->rsp.chn = &s->res;

 	txn->auth.method = HTTP_AUTH_UNKNOWN;

 	vars_init(&s->vars_txn,    SCOPE_TXN);
 	vars_init(&s->vars_reqres, SCOPE_REQ);
 }

 /* to be used at the end of a transaction */
 void http_end_txn(struct stream *s)
 {
 	struct http_txn *txn = s->txn;

 	/* these ones will have been dynamically allocated */
 	pool_free(pool_head_requri, txn->uri);
 	pool_free(pool_head_capture, txn->cli_cookie);
 	pool_free(pool_head_capture, txn->srv_cookie);
 	pool_free(pool_head_uniqueid, s->unique_id);

 	s->unique_id = NULL;
 	txn->uri = NULL;
 	txn->srv_cookie = NULL;
 	txn->cli_cookie = NULL;

 	if (!LIST_ISEMPTY(&s->vars_txn.head))
 		vars_prune(&s->vars_txn, s->sess, s);
 	if (!LIST_ISEMPTY(&s->vars_reqres.head))
 		vars_prune(&s->vars_reqres, s->sess, s);
 }


 DECLARE_POOL(pool_head_http_txn, "http_txn", sizeof(struct http_txn));
 DECLARE_POOL(pool_head_uniqueid, "uniqueid", UNIQUEID_LEN);

 __attribute__((constructor))
 static void __http_protocol_init(void)
 {
 }


 /*
  * Local variables:
  *  c-indent-level: 8
  *  c-basic-offset: 8
  * End:
  */