[Bug 1495988] Re: ProxyErrorOverride leads to slow 404 responses

[ChristianEhrhardt]

Thanks Robie for the help driving the other bug stalling in SRU - as a
note it is bug 1286882

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Title:
  ProxyErrorOverride leads to slow 404 responses

Status in Apache2 Web Server:
  Fix Released
Status in apache2 package in Ubuntu:
  Fix Released
Status in apache2 source package in Trusty:
  Triaged

Bug description:
  [Impact]
   * hang until ProxyTimeout timeout if ProxyErrorOverride is set
   * see https://bz.apache.org/bugzilla/show_bug.cgi?id=53420 for more

  [Test Case]
   * use the feature of https://httpd.apache.org/docs/current/mod/mod_proxy.html#proxyerroroverride

  [Regression Potential]
   * the patch is small and already backported by Apache people which is good
   * The changes are local to mod_proxy only which should limit the potential fallout
   * all basic tests I did still work, but we have to rely on a real test by the reporter from proposed for the actual Test

  [Original Description]

  Like described in #53420 [1] there is a bug in Apache 2.4.x which is
  fixed in 2.4.11.

  This bug leads to slow 404 responses when ProxyErrorOverride is
  activated.

  --------------------
  When setting ProxyErrorOverride to "On" to get the httpd-ErrorDocument
  instead of the backend-errordoc, httpd is waiting "ProxyTimeout" seconds
  to respond to the client, even though the response is already read from
  backend server.
  --------------------

  The bug is fixed in 2.4.11 [2]. Is there any chance to get this fix
  into the Ubuntu package for 14.04 LTS?

  [1] https://bz.apache.org/bugzilla/show_bug.cgi?id=53420
  [2] https://svn.apache.org/viewvc?view=revision&revision=1621601

  -----------
  $ apt-cache policy apache2
  apache2:
    Installed: 2.4.7-1ubuntu4.5
    Candidate: 2.4.7-1ubuntu4.5
    Version table:
   *** 2.4.7-1ubuntu4.5 0
          500 http://de.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
          100 /var/lib/dpkg/status
       2.4.7-1ubuntu4 0
          500 http://de.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
  -----------

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