This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
Question ID :998419573848 Identify the techniques that can be used to implement 'sessions' if the client browser does not support cookies. options given are: 1.URL rewritting 2.Hidden form fields 3.Using https protocol 4.Using http header 5.It can not be done without cookie support Choose any 2. right ans given are 1 & 3 but I think 1 & 2 Need explanation.. thanks in advance Trupti
Trupti, Definitely Hidden form fields is also a correct option for the question. [ Actually the question,should have been read as, "Identify the techniques that can be used to implement 'sessions' if the client browser does not support cookies and a) No work needs to be done by the servlet developer b) Secure way of maintaing sessions ] The question is actually based on the Servlets Specification. And in the Servlets specification,hidden form fields is not given as an option of maintaining Sessions. HTH
HTTP is a stateless protocol, hence the need for cookies or URL/form parameters to maintain HTTP sessions. However, HTTPS is not stateless as SSL requires a session to be set up between client and server. As a consequence the container can identify HTTPS clients simply by their SSL session. For the curious, SSL traffic is encrypted using a secret key, unsurprisingly called the session key. Agreeing on this key is one of the most important things that happen during session setup (SSL handshake). During the handshake they also exchange authentication information, usually the server certificate. - Peter