[MEDIUM] http: add support for conditional response header rewriting

Just as for the req* rules, we can now condition rsp* rules with ACLs.
ACLs match on response, so volatile request information cannot be used.
A warning is emitted if a configuration contains such an anomaly.
diff --git a/include/proto/proto_http.h b/include/proto/proto_http.h
index 6a424c0..68a771e 100644
--- a/include/proto/proto_http.h
+++ b/include/proto/proto_http.h
@@ -2,7 +2,7 @@
  * include/proto/proto_http.h
  * This file contains HTTP protocol definitions.
  *
- * Copyright (C) 2000-2009 Willy Tarreau - w@1wt.eu
+ * Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -76,7 +76,7 @@
 int apply_filter_to_req_headers(struct session *t, struct buffer *req, struct hdr_exp *exp);
 int apply_filter_to_req_line(struct session *t, struct buffer *req, struct hdr_exp *exp);
 int apply_filters_to_request(struct session *s, struct buffer *req, struct proxy *px);
-int apply_filters_to_response(struct session *t, struct buffer *rtr, struct hdr_exp *exp);
+int apply_filters_to_response(struct session *t, struct buffer *rtr, struct proxy *px);
 void manage_client_side_appsession(struct session *t, const char *buf, int len);
 void manage_client_side_cookies(struct session *t, struct buffer *req);
 void manage_server_side_cookies(struct session *t, struct buffer *rtr);