public override void AddMethod <TRequest, TResponse>(Method <TRequest, TResponse> method, ClientStreamingServerMethod <TRequest, TResponse> handler)
        {
            var callHandler = _serverCallHandlerFactory.CreateClientStreaming(method, _serviceInvokerFactory.CreateClientStreamingInvoker(method));

            EndpointConventionBuilders.Add(_builder.MapPost(method.FullName, callHandler.HandleCallAsync));
        }