error produced with cl-http by Mozilla browsers

I have some code that works fine for non-Mozilla browsers (e.g. 
Safari and Netscape 7.0) but returns an error for Mozilla browsers 
(e.g. Netscape 7.1).

What happens is that when I hit the submit button in a form, and the 
post is handled by a method that does a redirect, I get a warning 
about the redirect and then the following error message:

"The POST method is not supported for URLs of class HTTP-COMPUTED-URL."

Neither the warning not error occurs with non-Mozilla browsers.

Does anybody have any cl-http code that fixes this problem? I'd 
greatly appreciate it:  most browsers seem to be moving to a Mozilla 
core.

I am running:

CL-HTTP version:  70.190
Macintosh port version:  3.9.7
Lisp version:  Macintosh Common Lisp Version 5.0
Running on a:  PowerBook5,3

Here is a code fragment that reproduces the error:

(defmethod show-form ((url url:http-computed-url) stream)
   (http:with-successful-response (stream :html)
     (html:with-fillout-form (:post "/test/get-data" :stream stream)
       (html:accept-input 'html:submit-button "Submit" :stream stream))))

(http:export-url #u"/test/start"
                  :computed
                  :response-function #'show-form)

(defmethod get-data ((url url:http-form) stream query-alist)
   (declare (ignore stream query-alist))
   (http:redirect-request http:*server* (http:merge-url "/test/start")))

(http:export-url #u"/test/get-data"
                  :html-form
                  :pathname ""
                  :response-function #'get-data)


-- 
Mark Klein
Principal Research Scientist
Massachusetts Institute of Technology
77 Massachusetts Avenue, NE20-336
Cambridge MA 02139 USA
[email protected]