Kevin is correct. The question is very broad in order to answer it. Are you talking about a HTTP session from a particular application? or generally maintaining any type of HTTP session so that it doesn’t timeout?
Because the HTTP and TCP transport protocols have a number of mechanisms in place that cover network application , you must provide us with more information about your questions.
Previous member’s answer:
HTTP is stateless meaning that requests and responses have to be made for each communications session. Your question is very broad. What are you trying to accomplish?