Java Servlet redirect back to page originally redirected from

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Java

web

web_development

Hi,

I had a question about Java Servlets.

lets say I am on a servlet webpage, 'somePage'. I want to log in using another servlet, 'login' servlet. So i click on the log-in link on the 'somePage' and get redirected to the 'login' page. I type in my name and password and they are both correct. the login page has successfully logged me in. How do I get back to the, 'somePage' webpage? How does the login page know the page that requested it?

I have checed out a lot of the request parameters, but non tell me, yes, you were directed from page, 'somePage'. These are the the paramater i have looked at:

String authType = request.getAuthType();
String pathInfo = request.getPathInfo();
String pathTranslated = request.getPathTranslated();
String getUserName = request.getRemoteUser();
String remoteAdd = request.getRemoteAddr();
String uriString = request.getRequestURI();
String sessionID = request.getRequestedSessionId();
String serverName = request.getServerName();
Integer serverPort = request.getServerPort();
String servletPath = request.getServletPath();

I know some of these are obvously not going to give me the answer I am looking for, but I figure one of the HttpServletRequest parameters has got to tell me how I got to this page. Any help would be greatly appreciated. I'm going to continue my search for the answer. I've tried to search for this question, but haven't found an answer.