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

[Robie Basak]

It is an SRU requirement - "A [Test Case] section with detailed
instructions how to reproduce the bug. These should allow someone who is
not familiar with the affected package to reproduce the bug and verify
that the updated package fixes the problem."

Where this is impossible I have seen exceptions made, for example for
difficult to reproduce bugs such as non-deterministic ones or ones that
require certain hardware, and proceed with just an assurance that the
reporter will perform SRU verification. But without such an exceptional
reason I'd like a full test case before uploading the fix please.
Otherwise we often get stuck at SRU verification stage, the SRU fails to
land and we will still have disrupted others who run -proposed for us
for no good reason.

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https://bugs.launchpad.net/bugs/1495988

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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