[PATCH] Not Modified: prefer entity tags over date validators

[Maxim Dounin]

Hello!

On Tue, Nov 18, 2014 at 05:15:46PM -0800, Piotr Sikora wrote:

> # HG changeset patch
> # User Piotr Sikora <piotr at cloudflare.com>
> # Date 1416359232 28800
> #      Tue Nov 18 17:07:12 2014 -0800
> # Node ID 3efade6bb02f7962a5120e1a1f95a1dc8f0b6a4c
> # Parent  2f7e557eab5b501ba71418febd3de9ef1c0ab4f1
> Not Modified: prefer entity tags over date validators.
> 
> RFC7232 says:
> 
>    A recipient MUST ignore If-Modified-Since if the request contains an
>    If-None-Match header field; the condition in If-None-Match is
>    considered to be a more accurate replacement for the condition in
>    If-Modified-Since, and the two are only combined for the sake of
>    interoperating with older intermediaries that might not implement
>    If-None-Match.
> 
> and:
> 
>    A recipient MUST ignore If-Unmodified-Since if the request contains
>    an If-Match header field; the condition in If-Match is considered to
>    be a more accurate replacement for the condition in
>    If-Unmodified-Since, and the two are only combined for the sake of
>    interoperating with older intermediaries that might not implement
>    If-Match.

Current nginx behaviour is to respect both, and I don't see real 
reasons to change the behaviour.  A while ago I've tried to dig 
into HTTPbis VCS and tracker to find out why this part of the 
specification was changed from RFC2616, but failed.

-- 
Maxim Dounin
http://nginx.org/