I know the basic difference that response.sendRedirect sends back the header and RequestDispatcher.forward just forwards request to another resource.
The big question are there other methods to do these kind of operations other than the above 2 methods.
Also Is session lost in response.sendRedirect.What is the complete picture when it comes to forwarding/redirect to a new page in or outside the app ?
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A Change in PHP Behavior with Session Write Short Circuit (http://php.net/manual/en/book.session.php#116217) (Winter 2014)**
With the release of PHP 5.6 the session handler changed in a way that many think should be considered a bug. See the note …
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