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Can proxies rewrite Date:?

From: Jeffrey Mogul <mogul@pa.dec.com>
Date: Mon, 04 Mar 96 17:33:39 PST
Message-Id: <9603050133.AA06878@acetes.pa.dec.com>
To: Henrik Frystyk Nielsen <frystyk@w3.org>
Cc: http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com
Henrik Frystyk Nielsen writes:

    John Franks writes:
    
    > What about the date header being part of the data digested for the
    > message-digest.  Is it unsafe to assume that proxies will not mangle
    > the origin-server Date: header?
    
    Caching proxies will do so.

Huh?  Do you mean mean "existing caches do so" or "the HTTP/1.1 spec
allows them to do so?"  The latter is probably false (although not
explicitly so).

Our discussions (in the caching subgroup) have assumed that Date:
is set when the response is generated by the origin server, and
we have used this assumption to define the meaning of Expires:.
If proxies rewrite Date: response headers, we are in some trouble.

-Jeff

P.S.: We're OK if the rewriting results in semantically equivalent
dates (i.e., only a format change), but not if the "mangling" is
more general.
Received on Monday, 4 March 1996 17:52:38 EST

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