introduction and ETag question

Hi,

My name is Mati and I study computer sciense at Warsaw Uniwersity.

Together with Michal Matusiak, who I believe introduced himself
earlier, I want to contribute to squid.

Our area of interests is ETag support in squid 3.

That's enough about me.

I have a question concerning semantics of ETags.

During our tests with etag-patched squid 2.5 we discovered some
differences between squid's behavior and rfc2616...

One of them is major.

I would like to know whether this difference is based on some
considerations about nature of ETags and therefore should be ported to
squid 3, or not...

section 13.3.4 of rfc2616 states:
  
  "proxy, upon receiving a conditional request that includes both a
  Last-Modified date and one or more entity tags as cache validators, MUST
  NOT return a locally cached response to the client unless that cached
  response is consistent with all of the conditional header fields in the
  request"

We understand that if request has both If-Modified-Since and
If-None-Match, squid should return cached responce if the validation
holds true for both conditional headers.

But, patched squid 2.5 returns cached response if either of conditional
headers validates correctly...

Is it correct?
Are there some other documents or opinions (beside rfc2616) justifying
this difference?

best wishes,
Mati.
Received on Mon Apr 05 2004 - 10:16:42 MDT