code: def setup_oauth_client(self, url=None):
          
          if url and "://" in url:
              server, endpoint = self._deconstruct_url(url)
          else:
              server = self.client.server
  
          if server not in self._server_cache:
              self._add_client(server)
  
          if server == self.client.server:
              self.oauth = OAuth1(
                  client_key=self.store["client-key"],
                  client_secret=self.store["client-secret"],
                  resource_owner_key=self.store["oauth-access-token"],
                  resource_owner_secret=self.store["oauth-access-secret"],
              )
              return self.oauth
          else:
              return OAuth1(
                  client_key=self._server_cache[server].key,
                  client_secret=self._server_cache[server].secret,
              )
docs: Sets up client for requests to pump