Re: Disabling the "Vary" header / Potential repercussions

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On 4 May 2007, at 03:49, Fred Tyler wrote:

[chop]

This is OTTOMH.


1. Add "Header unset Vary" to httpd.conf. The problem with this is
that it just doesn't work. I don't know why, but I've stuck it in
about 100 different places and it doesn't make any difference. That
"Vary" header never goes away.

That'll be order of execution.

2. Add "SetEnv force-no-vary" to httpd.conf. The problem with this is
that it also degrades the connection to HTTP/1.0, which presumably has
the side effect of killing HTTP pipelining. On a heavily trafficked
site with a lot of small files requested on each page view, this is
not a good trade-off.

I don't think so.  HTTP/1.0 defaults to keepalive off, but still allows
keepalive.  Pipelining beyond that isn't AFAIK well-supported in today's
browsers, so isn't really an issue. But I haven't looked at force-no- vary,
which presumably has a specific purpose.

1. Modify src/main/http_protocol.c so that "force-no-vary" does not
also trigger "force-no-response".

Both of those are hacks.  I'd say go ahead if and only if you can trace
and understand the exact purpose of them, and how that'll affect them.

2. Modify src/modules/standard/mod_negotiation.c by commenting out the
entire section that sets the Vary and TCN headers in the first place.

It might be as simple as reordering mod_negotiation's adding the headers
and mod_headers hacking them.  But I'd need to look.

--
Nick Kew

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