The intention of the precompilation request is that of a hint to the JSP container to 
 the JSP page into its JSP page implementation class.  The hint is conveyed by 
given the parameter the value "true" or no value, but note that the request can be just ignored 
in all cases.
For example:
1.  ?jsp_precompile
2. ?jsp_precompile="true"
3. ?jsp_precompile="false"
4. ?foobar="foobaz"&jsp_precompile="true"
5. ?foobar="foobaz"&jsp_precompile="false"
1, 2 and 4 are legal; the request will not be delivered to the page. 3 and 5 are legal; the 
request will be delivered to the page with no changes.
6. ?jsp_precompile="foo"
This is illegal and will generate an HTTP error; 500 (Server error).
JavaServer Pages 1.1 Specification  
November 30, 1999

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