What do you mean by Servlet chaining?
Servlet Chaining is a way where the output of one servlet is piped to the input of another servlet, and the output of that servlet can be piped to the input of yet another servlet and so on. Each servlet in the pipeline can either change or extend the incoming request. The response is returned to the browser from the last servlet within the servlet chain. In the middle, the output out of each servlet is passed as the input to the next servlet, so every servlet within the chain has an option to either change or extend the content.
