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Re: what's a CGI to do?...

From: Dave Kristol <dmk@allegra.att.com>
Date: Thu, 30 Nov 95 17:24:43 EST
Message-Id: <9511302225.AA21609@ig2.att.att.com>
To: drtr1@cus.cam.ac.uk
Cc: www-talk@w3.org
drtr1@cus.cam.ac.uk (David Robinson) wrote:
  > > [DMK]
  > >...
  > >Let me paraphrase the problem.  NCSA httpd (and my server) allow a CGI
  > >to give a "local" Location: header that causes the server to process
  > >the resulting redirection without first sending anything to the client.
  > >Beyond that I think the "correct" behavior is undefined.  So I'm trying
  > >to define it.
  > >
  > >Some questions that come up are:
  > >
  > >1) What should the method be for the redirected request?
  > >(N.B.  I think the behavior should be consistent with what happens for a
  > >"full" URL that gets returned to a client.)
  > 
  > A "GET" method. It's the only useful behaviour; the CGI script has no means
  > for supplying content.
Which means you disagree with Koen Holtmann.  And this apparently violates
the idea that the local redirect should do what the user-agent would do.
  > 
  > >2) If the method should indeed be POST, where does the content come from?
  > >(POST requires Content-Type and Content-Length headers.)
  > 
  > Logically, from the script that returned the Location: header. Unfortunately,
  > there is currently no way to arrange that.
Repeat previous remarks here.
  > 
  > >3) Should there be a way for a CGI to specify the method to use with a
  > >redirection?  If yes, only for local URLs, or for full ones, too?
  > 
  > You could do it for local URLs by having a Method: header, and taking
  > any content produced by the CGI script as input content for the redirected
  > request.
  > 
  > > 4) What environment should be passed to a CGI (like T2 above) that is
  > > reached via a redirection?
  > > (Here again, I think it should be the same as if a full URL got sent
  > > back to the client, and the client made a new request.)
  > 
  > Yes. That is what servers currently do on internal redirection. However, some
  > servers also pass the CGI variables for the original request prefixed by
  > REDIRECT_. e.g. Client requests http://foo.com/script?args
  > The server (perhaps because of script being a CGI script returning a
  > Location: /bar header) internally redirects this to the CGI script
  > http://foo.com/bar
  > then this script gets the environment variables
  > SCRIPT_NAME=/bar
  > QUERY_STRING=""
  > REDIRECT_SCRIPT_NAME=/script
  > REDIRECT_QUERY_STRING=args

Interesting.  What server does that?

Dave Kristol
Received on Thursday, 30 November 1995 17:25:11 GMT

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