variables
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.
request
Contains the request object. response
Contains the response object. pageContext
State for the current page. session
The current session. session is available only
when the session directive
is true. application
The current application. out
The buffered stream to the HTTP response. page
The current servlet. exception
For error pages, the exception thrown from the broken page.
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