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JSP makes implicit variables available to the script. These variables are used to gain information about the request, and to help form a response. They also expose some useful functionality.
requestContains the request object. responseContains the response object. pageContextState for the current page. sessionThe current session. session is available only when the session directive is true. applicationThe current application. outThe buffered stream to the HTTP response. pageThe current servlet. exceptionFor error pages, the exception thrown from the broken page.
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