help re error: "Method Not Allowed: The POST method is not supported for URLs of class HTTP-SEARCH"

I have a puzzling problem which I need to solve very soon. I am 
running cl-http 70.190a on Mac OS X.

I have written a server with some http-search methods that create 
fillout forms, e.g.

(defmethod edit-service ((url url:http-search) stream)
     ...
      (html:with-fillout-form (:post #u"/pql/save-values" :stream stream)
          ...
          (html:accept-input 'html:submit-button "Submit" :stream stream))
          ...

(http:export-url #u"/pql/edit-service?"
                  :search
                  :response-function #'edit-service)

These posts are handled by http-form methods, e.g.

(defmethod save-values ((url url:http-form) stream query-alist)
    ...
   (http:redirect-request http:*server* (http:merge-url (url 'home))))))

(http:export-url #u"/pql/save-values"
                  :html-computed-form
                  :form-function #'list
                  :response-function #'save-values)

This works perfectly fine when I use it, for all the browsers and 
operating systems I have tried.

BUT, when my colleagues in Zurich try to use it, using the same 
browsers and OS, they get the error:

     " Method Not Allowed: The POST method is not supported for URLs 
of class HTTP-SEARCH"

Any ideas what is going on? I'd greatly appreciate some quick 
insights into this.

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