Javadoc
Saved servlet request.
Note bill burke: I had to fork this because Undertow was automatically restoring the request before the code could be
processed and redirected.
CachedAuthenticatedSessionHandler was restoring the request before the authentication manager could read the code from the URI
Originally, I copied SavedRequest as is, but there are type mismatches between Undertow 1.1.1 and 1.3.10.
So, trySaveRequest calls the same undertow version, removes the saved request, stores it in a different session attribute,
then restores the old attribute later