[PATCH] backend conditional requests second release

[Geoff Simmons]

Hello all,

Here's the second release of the "If-Modified-Since" function (backend
conditional requests).

The main changes since the version from March 1st:

- now using phk's EXP_* interface for managing the timers, and extends
it to manage conditional timeout

- the name "conditional_timeout" is shortened to "cond_ttl", as
discussed on IRC

- compiles without warnings (does not fail on -Werror)

- fixed the problem that beresp.ttl was always -1 immediately after a
304 validation

- now properly delivers validated gzipped content to clients (the last
three issues spotted by Dmitry Panov, thanks Dmitry)

- eliminated the stats counter cache_cond_not_modified, which was
redundant because Varnish already has fetch_304

- re-named the other new counter to cond_not_validated, which is now
incremented for any non-304 backend response to a conditional request

We'd be grateful for any more testing and feedback!


Best,
Geoff Simmons
-- 
** * * UPLEX - Nils Goroll Systemoptimierung

Schwanenwik 24
22087 Hamburg

Tel +49 40 2880 5731
Mob +49 176 636 90917
Fax +49 40 42949753

http://uplex.de
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