- From: John Franks <john@math.nwu.edu>
- Date: Wed, 3 Sep 1997 11:40:41 -0500 (CDT)
- To: Larry Masinter <masinter@parc.xerox.com>
- Cc: http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com
On Wed, 3 Sep 1997, Larry Masinter wrote: > I think there are a lot of 'headers' that might want to appear in > the 'trailer' from the point of view of the sender, but of course, > a recipient cache want to use some of the header information to > decide where to cache the incoming data. > > I don't think we can continue to evalute these one-by-one, though. > Is there some general principle to apply? > We should keep the alternatives in mind. In the case of Last-modified-date for server side includes the choice for many (but not all) servers will be l-m-d in the trailer or no l-m-d. In the case of Vary for server parsed documents the choice is likely to be an accurate Vary in the trailer or a "Vary: *" in the header. A general principle which might make sense is that if the alternative to the header in the trailer is not sending the header at all, then we should allow it. After all, the proxy can ignore it and be no worse off. Vary does not quite fit in this situation, but I think a good case can be made for it. However, the spec might say the server SHOULD put headers at the beginning rather than in a trailer if this is possible. John Franks Dept of Math. Northwestern University john@math.nwu.edu
Received on Wednesday, 3 September 1997 09:44:10 UTC