docs: def request_url(self, request, proxies):
          """Obtain the url to use when making the final request.
  
          If the message is being sent through a HTTP proxy, the full URL has to
          be used. Otherwise, we should only use the path portion of the URL.
  
          This should not be called from user code, and is only exposed for use
          when subclassing the
          :class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
  
          :param request: The :class:`PreparedRequest <PreparedRequest>` being sent.
          :param proxies: A dictionary of schemes to proxy URLs.
          """
          proxies = proxies or {}
          scheme = urlparse(request.url).scheme
          proxy = proxies.get(scheme)
  
          if proxy and scheme != 'https':
              url, _ = urldefrag(request.url)
          else:
              url = request.path_url
  
          return url