#11813: Stale caches with trac and transparent proxies
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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 leif):
Replying to [ticket:11813 vbraun]:
> 4. Download the patch again - under some circumstances the old version
of the patch is served by the (not so) transparent proxy.
> [[BR]]
> This just happened to me with `trac11115-cached_cython.patch`.
Well, if you name it such...
SCNR
[[BR]]
> A workaround is to set the `Pragma: no-cache` in the client query (i.e.
use `wget --no-cache`), but then its easy to forget that.
You can put it into `~/.wgetrc`.
[[BR]]
> Irrespective of who is precisely at fault, we should configure the trac
server to never allow caching of the patches since their integrity is
crucial for us and client-side caching doesn't really buy us much. For
that, I propose to configure Apache to add the following to the headers
for all resources under `/sage_trac/raw_attachment`:
{{{
Cache-Control: no-cache
Expires: Thu, 1 Jan 1970 00:00:00 GMT
}}}
> hitting both the HTTP/1.0 and 1.1 cache control mechanisms.
Hmmm, I cannot tell how large the impact ''on the machine running trac''
will be, but in general I think that's a bad idea.
I don't think it will be large at the moment ''for ordinary users'', as
most patches are [hopefully] small, but note that this also inhibits the
use of `-N` (`--timestamping`), which is more [or also] crucial to the
''client side'', especially for bots (or if you have a very slow, or
expensive / volume-taxed connection).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11813#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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