post = compat_urllib_parse.urlencode(fields)
         req = compat_urllib_request.Request(url, post)
         req.add_header('Content-type', 'application/x-www-form-urlencoded')
         post = compat_urllib_parse.urlencode(fields)
         req = compat_urllib_request.Request(url, post)
         req.add_header('Content-type', 'application/x-www-form-urlencoded')