code: def _relay(self, **kwargs):
          
          retval = None
          delay_time = 2  # For connection retries
          read_attempts = 0  # For reading from socket
          while retval is None:  # Evict can return False
              sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
              sock_fp = sock.makefile('rwb')  # Used for pickle
              try:
                  sock.connect((self.host, self.port))
                  cPickle.dump(kwargs, sock_fp, cPickle.HIGHEST_PROTOCOL)
                  sock_fp.flush()
                  retval = cPickle.load(sock_fp)
              except:  # pylint: disable=W0702
                  exc_type, exc, _ = sys.exc_info()
                  socket_error = exc_type is socket.error
                  if socket_error and exc.errno == 111:  # Connection refused
                      sys.stderr.write('Cannot connect to multiprocess server. I'
                                       's it running? Retrying in {0} seconds.\n'
                                       .format(delay_time))
                      time.sleep(delay_time)
                      delay_time = min(64, delay_time * 2)
                  elif exc_type is EOFError or socket_error and exc.errno == 104:
                      # Failure during socket READ
                      if read_attempts >= 3:
                          raise ClientException('Successive failures reading '
                                                'from the multiprocess server.')
                      sys.stderr.write('Lost connection with multiprocess server'
                                       ' during read. Trying again.\n')
                      read_attempts += 1
                  else:
                      raise
              finally:
                  sock_fp.close()
                  sock.close()
          if isinstance(retval, Exception):
              raise retval  # pylint: disable=E0702
          return retval
docs: Send the request through the server and return the HTTP response.