Add <compatibility> notes for changes made in version 2.4.8 + synch formating with 2.4.x

git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1587032 13f79535-47bb-0310-9956-ffa450edef68
  *) mod_proxy_wstunnel: Don't pool backend websockets connections,
     because we need to handshake every time. PR 55890.
     [Eric Covener]



git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1587036 13f79535-47bb-0310-9956-ffa450edef68
actually remove mod_reqtimeout, since the util_filter functions involved
only manipulate c->input_filters no matter what we pass. We need to make
copies of c->input_filters after, not before, it skips over reqtimeout.

Note: reqtimeout doesn't really interfere today with normal operation,
but this is misleading/confusing when dealing with other
wstunnel issues.



git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1587040 13f79535-47bb-0310-9956-ffa450edef68
cleanup wstunnel error handling

Submitted By: covener, ylavic, Edward Lu
Commited By: covener



git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1587053 13f79535-47bb-0310-9956-ffa450edef68
stop leaking websockets backend connections (trunk only)


git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1587057 13f79535-47bb-0310-9956-ffa450edef68
several related mod_proxy_wstunnel changes that are tough to pull apart:

* make async websockets tunnel opt-in
* add config for how long we block a thread in asynch mode
* add config for a cap on the synchronous path
* avoid sending error responses down the upgraded tunnel



git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1587075 13f79535-47bb-0310-9956-ffa450edef68