Enable POST redirects on session timeout
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                 Key: JSEC-44
                 URL: https://issues.apache.org/jira/browse/JSEC-44
             Project: JSecurity
          Issue Type: New Feature
          Components: Session Management
            Reporter: Jesse O'Neill-Oine


When a user is filling out a form for a long time and they don't submit (POST) 
within the session timeout limit they lose the newly entered data because after 
logging in they are redirected via GET to the target URI.  This feature would 
enable redirecting a POST as a POST and therefore after successfully logging 
back in the user would see the result of their initial action.

See email thread here: 
http://jsecurity.markmail.org/search/JSecurity+Saving+POST+data%3F?page=1

Summary:
The solution might work like this:  

since we have control over the Request/Response pair, we could do something 
snazzy where, if the SavedRequest in the session is a POST request, we can 
manually construct a Request object indicating a POST method and send that into 
the filter chain directly instead of the originating GET Request given to us by 
the Servlet container.

So, in essence, a GET would be redirected as a GET, and a POST would be 
redirected as a POST.  It would work in a REST scenario because the 
SavedRequest is stored in the session.

But this again assumes that this is even desirable (POST redirect).  We could 
make it configurable I suppose (enablePostRedirects = true/false) in the 
JSecurityFilter configuration if someone didn't like that idea.

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