Re: URI-protocol mapping (was Re: How to add new "protocols" ?)
touch@isi.edu Thu, 20 February 1997 17:28 UTC
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To: touch@isi.edu, liberte@ncsa.uiuc.edu
Subject: Re: URI-protocol mapping (was Re: How to add new "protocols" ?)
Cc: luigi@labinfo.iet.unipi.it, ses@tipper.oit.unc.edu, masinter@parc.xerox.com, uri@bunyip.com
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> From: Daniel LaLiberte <liberte@ncsa.uiuc.edu> > > Simon (and others) made a point that was almost lost in the divergence > into efficiency considerations. The point is that there is a choice > that *can* be made in how to resolve any URI (not just http URLs). > Each client can make this choice and local or remote servers can help > it make that choice. The choice might be made on the basis of > efficiency, security, reliability, or any number of other factors. Then it is no longer a URL, it is a URN (or perhaps URI, depending on how each is defined). And all the "discovery" procedures you outlined come into play. However, it adding that 2-level binding to URLs removes any notion of the base, static case which has proven so useful in bootstrapping the Web protocols. I am in favor of URN-servers indicating the protocol of choice, but this can be done when the URN returns a URL that has the appropriate protocol prefix, i.e. http: or http-tp4:. > To be blunt, the strong binding of "http" URLs to the HTTP protocol > is an illusion. It is merely an association. It can only be that. > What makes it *appear* to be a strong binding is that for the most > part HTTP over TCP is, in fact, used. The spec is not an illusion on this point. It is very clear on how http: URLs are interpreted. > Here is a more generalized list of possible ways to discover the > semantics of a URI, starting local to the client and moving out > to remote services. See - you're using URI here. That's fine. It's not a URL. Joe ---------------------------------------------------------------------- Joe Touch - touch@isi.edu http://www.isi.edu/~touch/ ISI / Project Leader, ATOMIC-2, LSAM http://www.isi.edu/atomic2/ USC / Research Assistant Prof. http://www.isi.edu/lsam/
- URI-protocol mapping (was Re: How to add new "pro… Daniel LaLiberte
- Re: URI-protocol mapping (was Re: How to add new … touch
- Re: URI-protocol mapping (was Re: How to add new … Daniel LaLiberte
- Re: URI-protocol mapping (was Re: How to add new … touch
- Re: URI-protocol mapping (was Re: How to add new … Daniel LaLiberte
- Re: URI-protocol mapping (was Re: How to add new … touch
- Re: URI-protocol mapping (was Re: How to add new … Roy T. Fielding
- Re: URI-protocol mapping (was Re: How to add new … Dan Connolly
- Re: URI-protocol mapping (was Re: How to add new … Ron Daniel Jr.
- Re: URI-protocol mapping (was Re: How to add new … Dan Connolly
- Re: URI-protocol mapping (was Re: How to add new … touch
- Re: URI-protocol mapping (was Re: How to add new … Ron Daniel Jr.
- Re: URI-protocol mapping Dan Connolly
- Re: URI-protocol mapping (was Re: How to add new … Dan Connolly
- Re: URI-protocol mapping Daniel LaLiberte
- Re: URI-protocol mapping (was Re: How to add new … Ron Daniel Jr.