[Bug 1336742] Re: Caching responses with "Vary" header

[Brian Murray]

I'll go ahead and sponsor this.

** Changed in: squid3 (Ubuntu Trusty)
     Assignee: (unassigned) => Brian Murray (brian-murray)

** Changed in: squid3 (Ubuntu Trusty)
       Status: Triaged => In Progress

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Title:
  Caching responses with "Vary" header

Status in Squid Web Proxy Cache:
  Fix Released
Status in squid3 package in Ubuntu:
  Fix Released
Status in squid3 source package in Trusty:
  In Progress
Status in squid3 package in Debian:
  Fix Released

Bug description:
  See the upstream bug report for more details [1], but it seems as
  though squid in trusty isn't caching any response which includes a
  vary header [2]. The upstream bug was fixed in 3.3.12 [3].

  Steps to reproduce:
   * Setup an application returning responses with "Vary: User-Agent"
   * Add squid in front of an application server
   * Make multiple requests to squid

  Expected result:
   * Second request is a Hit

  Actual result:
   * Second (and subsequent) requests are all misses.

  Repeat without a Vary header and things are cached as expected. Note,
  I've only reproduced this with a specific setup (as in [2]), I've not
  yet reproduced with a simplified setup to be certain I'm seeing the
  upstream bug.

  
  [1] http://bugs.squid-cache.org/show_bug.cgi?id=3806
  [2] http://paste.ubuntu.com/7736175/
  [3] http://www.squid-cache.org/Versions/v3/3.3/changesets/SQUID_3_3_12.html

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