#11813: Stale caches with trac and transparent proxies
----------------------------+-----------------------------------------------
Reporter: vbraun | Owner: mvngu, schilly
Type: defect | Status: new
Priority: major | Milestone: sage-4.7.2
Component: website/wiki | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by vbraun):
I just looked at the trac server logs, and it never receives a second
request for anything under `/sage_trac/raw-attachment` from our squid
transparent proxy. So the culprit is definitely squid having a problem
with ETag. Even though the docs say that it should work.
The caching works correctly for other resources, for example if I request
`http://trac.sagemath.org/sage_trac/chrome/common/download.png` from
behind the transparent proxy it does send a request up to the trac server,
is answered with a `HTTP 304`, and serves the up-to-date cached version.
The only difference I can see is that trac does not include an ETag header
in that case, so it is a different code path in squid.
{{{
vbraun@boxen:~$ wget -O- -S
trac.sagemath.org/sage_trac/chrome/common/download.png | md5sum
--08:21:23--
http://trac.sagemath.org/sage_trac/chrome/common/download.png
=> `-'
Resolving trac.sagemath.org... 128.208.160.197
Connecting to trac.sagemath.org|128.208.160.197|:80... connected.
HTTP request sent, awaiting response...
HTTP/1.1 200 Ok
Date: Sun, 18 Sep 2011 15:21:23 GMT
Server: Apache/2.2.8 (Ubuntu) DAV/2 SVN/1.5.1 mod_python/3.3.1
Python/2.5.2 mod_ssl/2.2.8 OpenSSL/0.9.8g mod_wsgi/2.0
Content-Length: 164
Last-Modified: Fri, 23 Oct 2009 03:56:53 GMT
Keep-Alive: timeout=15, max=1000
Connection: Keep-Alive
Content-Type: image/png
Length: 164 [image/png]
100%[=============================================================================>]
164 --.--K/s
08:21:24 (10.92 MB/s) - `-' saved [164/164]
750ae6e7739e23934867fb5fe9ee0bee -
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11813#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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