Re: comments on HTTP draft of 5 Nov 93

Tony Sanders (
Wed, 08 Dec 1993 14:14:36 -0600

> But it would seem that SPACEJUMP and TEXTSEARCH are not "methods"
> at all, but rather a pair of keywords that inform us of the
> capabilities of a particular server or document.
> The meaning of these keywords is that server is prepared to
> accept URLs with particular syntaxes and interpret them according
> to a set of shared conventions.
Agreed. We need an extensible attribute scheme. Of course, you could
just use headers but that tends to be too unstructured.

> It seems to me that TEXTSEARCH means ISINDEX will work, and SPACEJUMP
> means ISMAP will work, and there is no way to say that FORM will work.
I think that's because a FORM is an attribute of the document contents,
not the document itself.

> So I am trying to argue here that "SPACEJUMP" and "TEXTSEARCH" are
> really trying to tell you something about the document, not about
> GET per se.
Mostly correct. It's actually telling you something about the OBJECT in
question. Not all objects are documents. However, it also implies
what you can *do* with the object and how it is to be done. Therefore
it helps defines the interface to the object.

> 3) It is very unlikely that these two keywords convey useful information,
> because most likely, the way you do a GET is by first pulling some
> other document from the server. Do we really expect it to happen
> that someone will obtain a URL, then do a HEAD on it (to find out
> whether they can use ISMAP syntax to address it), and then do a GET?
No, the browser GET's the URL and says to itself "hey, I can search
using this URL and this method". Then it changes the user interface
so the user also knows this fact.

> In summary - SPACEJUMP and TEXTSEARCH don't convey useful information,
> have the wrong names for the meanings that they do have, and should
> not be considered methods. They should be removed.
You are forgetting a very important fact here. Not all objects returned
by HTTP are HTML. This information *MUST* be allowed in the object
meta-information (aka the HTTP header) because not all data types allow

Perhaps the design should be changed a bit but SPACEJUMP and TEXTSEARCH
should *NOT* be removed in spirit. I see the names as a pretty arbitrary
since only software ever sees them.