The request object based RequestDispatcher object expects that the source servlet Program, destination web resource program and the destination web resource program be in the same web application.
The ServletContext object based RequestDispatcher object allows to keep the source servlet program and destination web resource program either in the same web application or in two different web application of the same server, but they cannot be two different web applications of two different servers.
Here, we can use request object or ServletContext object based.
Here Srv1 should use ServletContext object based RequestDispatcher object.
This kind of ServletChaining is not possible with RequestDispatcher object use send redirection concept. Servlet chaining is all about performing servlet-servlet communication.