How to create a reqeust by Mock?

Hi,

I would like to create a request by Mock. For example, after I have sent a request to mock service, not only the response will be created but also mock service will create a request to the request sender and get a response from the request sender. It is something like a ping pong between request and response. How can I do this?

Thank you very much in advace for your time

Best Regards
Can