'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 or schemes and hosts to proxy URLs.
:rtype: str'

def request_url(self, request, proxies):

    proxy = select_proxy(request.url, proxies)
    scheme = urlparse(request.url).scheme
    is_proxied_http_request = (proxy and (scheme != 'https'))
    using_socks_proxy = False
    if proxy:
        proxy_scheme = urlparse(proxy).scheme.lower()
        using_socks_proxy = proxy_scheme.startswith('socks')
    url = request.path_url
    if (is_proxied_http_request and (not using_socks_proxy)):
        url = urldefragauth(request.url)
    return url
