Re: ETag Validiation?

From: Alex Rousskov <>
Date: Wed, 21 Oct 1998 00:11:46 -0600 (MDT)

On Wed, 21 Oct 1998, Nottingham, Mark (Australia) wrote:

> One of the items on TODO is cache validation based upon Entity Tags.
> Anybody have a rough idea of when this might be done?

RFC 2068: "HTTP/1.1 uses entity tags in
                the ETag (section 14.20),
                If-Match (section 14.25),
                If-None-Match (section 14.26), and
                If-Range (section 14.27) header fields."

Squid already honors ETags in If-Range request headers (for Range requests)
and takes a note of "ETag:" reply header.

I read the specs for other headers; it looks like a simple hack may not do

I've just added counters for If-Match and If-None-Match request headers. If
those headers are present in more than 1% of requests coming through the
NLANR Caches, the support will likely to be added within two-four weeks.


P.S. Anybody knows what to do with an "ETag:" _header_ in a _request_ ?!
Received on Wed Oct 21 1998 - 00:23:47 MDT

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