[Bug 48364] PHP-generated pages are not cached in spite of pertinent header entries

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=48364

Dave Taylor <d....@leedsbeckett.ac.uk> changed:

           What    |Removed                     |Added
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                 CC|                            |d.v.taylor@leedsbeckett.ac.
                   |                            |uk

--- Comment #17 from Dave Taylor <d....@leedsbeckett.ac.uk> ---
Apologies for resurrecting an oldish bug, but I've hit this in Apache 2.2.27
(and from looking at the relevant bits of code in 2.2.29 I can't see anything
that's changed that would fix it).

>From a bit of investigation it looks like what happens is:

1. mod_cache, in its quick handler, adds an output filter CACHE_SAVE to the
request.
2. action_handler() in mod_actions calls ap_internal_redirect_handler() using
the path that was set up in the "Action" directive.
3. ap_internal_redirect_handler() in turn calls internal_internal_redirect() to
create a new request_rec, which strips off *all* the resource-specific output
filters - including CACHE_SAVE.
4. ap_internal_redirect_handler() then *doesn't* call ap_run_quick_handler()
for the new request_rec, so mod_cache doesn't get a look at the new request at
all. N.b. this is different to the behaviour of ap_internal_redirect(), but
perhaps deliberately so?

So it might be possible to resolve this by allowing
ap_internal_redirect_handler() to run the quick handler against the new
request_rec (but that might have unintended consequences for quick handlers in
other modules than mod_cache?) Or it could perhaps be resolved by backporting
CacheQuickHandler to 2.2.x so that mod_cache doesn't have to run "quick".

Or I may have misunderstood what's going on entirely(!)

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