code: def create_txacme_client_creator(key, reactor, url, alg=RS256):
      
      # Creating an Agent without specifying a pool gives us the default pool
      # which is non-persistent.
      jws_client = JWSClient(HTTPClient(agent=Agent(reactor)), key, alg)
  
      return partial(txacme_Client.from_url, reactor, url, key, alg, jws_client)
docs: Create a creator for txacme clients to provide to the txacme service. See
      ``txacme.client.Client.from_url()``. We create the underlying JWSClient
      with a non-persistent pool to avoid
      https://github.com/mithrandi/txacme/issues/86.
  
      :return: a callable that returns a deffered that returns the client