[MINOR] http: make it possible to pretend keep-alive when doing close
Some servers do not completely conform with RFC2616 requirements for
keep-alive when they receive a request with "Connection: close". More
specifically, they don't bother using chunked encoding, so the client
never knows whether the response is complete or not. One immediately
visible effect is that haproxy cannot maintain client connections alive.
The second issue is that truncated responses may be cached on clients
in case of network error or timeout.
Óscar Frías Barranco reported this issue on Tomcat 6.0.20, and
Patrik Nilsson with Jetty 6.1.21.
Cyril Bonté proposed this smart idea of pretending we run keep-alive
with the server and closing it at the last moment as is already done
with option forceclose. The advantage is that we only change one
emitted header but not the overall behaviour.
Since some servers such as nginx are able to close the connection
very quickly and save network packets when they're aware of the
close negociation in advance, we don't enable this behaviour by
default.
"option http-pretend-keepalive" will have to be used for that, in
conjunction with "option http-server-close".
diff --git a/include/types/proxy.h b/include/types/proxy.h
index c3fd01a..fb34513 100644
--- a/include/types/proxy.h
+++ b/include/types/proxy.h
@@ -138,6 +138,7 @@
#define PR_O2_USE_PXHDR 0x00040000 /* use Proxy-Connection for proxy requests */
#define PR_O2_CHK_SNDST 0x00080000 /* send the state of each server along with HTTP health checks */
#define PR_O2_SSL3_CHK 0x00100000 /* use SSLv3 CLIENT_HELLO packets for server health */
+#define PR_O2_FAKE_KA 0x00200000 /* pretend we do keep-alive with server eventhough we close */
/* end of proxy->options2 */
/* bits for sticking rules */