Re: How to do DTD in squid?

This would in principle be similar to the cache validations running today
using If-Modified-Since queries I guess. See code thread involving
clientHandleIMSReply.

The logics for things like this (currently) belongs in client_side.c. There is
no need to change http.c.

Regards
Henrik

Yee Man Chan wrote:
> Hi, folks,
>
> I am trying to implement DTD in squid. The idea of
> DTD is to send a HEAD request before GET to ask for
> the Content-MD5 of a URL in the case of a URL miss. If
> the returned Content-MD5 matches anything in the disk
> cache (my disk cache is indexed by Content-MD5 values
> instead of URLs), then it results in a cache hit.
> Otherwise, it will have to run the GET request to
> download the URL.
>
> Obviously, DTD disrupts squid's HTTP flow. So I am
> stuck and don't know what to do... Here are my
> questions:
>
> 1) Where should I make the Content-MD5 lookup after I
> get a reply from my HEAD request?
>
> 2) The way I do DTD is to modify every METHOD_GET
> request to METHOD_HEAD in clientProcessMiss. But then
> when I am done downloading the HEAD reply, I am in
> httpReadReply of http.c. storeClientCopy can't
> run with clientCacheHit in http.c, so I can't handle
> the case when there is a hit after I did a lookup in
> my Content-MD5 table. How should I get around this
> problem?
>
> I am hacking 2.4S7. You can find more information
> about DTD by going to
> http://devel.squid-cache.org/dtd/.
>
> Thanks in advance. Any help is appreciated.
>
> Regards,
> Yee Man
>
>
>
>
>
>
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Received on Wed Aug 21 2002 - 05:20:57 MDT