I'd like to add my 2 cents worth on this subject: I think
the DISPLAY option would be extremely useful, especially
for implementing callbacks to the viewer from an http
server. For example, I could imagine viewing a document
and in the process registering a callback so that if the
document changes my viewer is automatically updated.
Although this could be implemented using GET from the
server which then causes the viewer to go back to the
document, I think the DISPLAY option is more elegant.
(Personally I'd overload POST to have an optional
destination field, rather than having DISPLAY anyway, but
if that's not on the cards I'd vote for DISPLAY).
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Re: DISPLAY option 
