Re: Mod_Proxy and 100-Continue

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On Tue, 30 Sep 2008 09:50:00 -0400
"Tom Wells" <drshade@xxxxxxxxx> wrote:


>   ServerName munchkin.synthesis.co.za
>   Header add Set-Cookie "MOD_PROXY_FOOD=FOO;" early

Why?

The "early" keyword exists to help developers simulate
a request, for example when debugging a new module.
Perhaps it should've remained undocumented.


>  Also (as far as I understand) modproxy
> should try to preserve any headers already set before processing by
> merging the headers before and after processing (especially any
> Set-Cookie headers).

HTTP has no provision for a proxy to set an end-to-end header
such as Set-Cookie - only how it should deal with headers set by
the backend.  mod_headers isn't part of the protocol implementation;
it's a convenience for users who want to change the default behaviour.

> Maybe this is normal modproxy behaviour, I can't be certain, but
> reading through some of mod_proxy_http.c seems to show that this is
> the intention. However I was able to test this on another Apache
> instance running 2.2.4 and modproxy retains both cookies in both
> cases. So either this is a bug in 2.2.9 or it's a bug that was fixed
> since 2.2.4.

It's probably a side-effect of fixing 
https://issues.apache.org/bugzilla/show_bug.cgi?id=16518
and associated improvements.

But it's not a bug now, nor was it before.  If you want to set
a header with predictable behaviour, don't use "early".

-- 
Nick Kew

Application Development with Apache - the Apache Modules Book
http://www.apachetutor.org/

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