Constructs verifier OAuth URL

def construct_oauth_url(self):
        """ Constructs verifier OAuth URL """
        response = self._requester(requests.head, 
                                   "{0}://{1}/".format(self.protocol, self.client.server),
                                   allow_redirects=False
                                  )
        if response.is_redirect:
            server = response.headers['location']
        else:
            server = response.url

        path = "oauth/authorize?oauth_token={token}".format(
            token=self.store["oauth-request-token"]
        )
        return "{server}{path}".format(
            server=server,
            path=path
        )