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Practical Use for Header Values?

 
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I understand the passing of parameters and how cookies are used for session management, but how are user-defined header values useful??

HFSJ Ch4 introduces the addHeader("foo", "bar") and setHeader() methods, but does not discuss their practical use!
[ August 09, 2005: Message edited by: Jack Gold ]
 
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setHeader might be used if you need to control stuff like cache.

response.setHeader("Cache-Control","no-store"); //HTTP 1.1
response.setHeader("Pragma","no-cache"); //HTTP 1.0
 
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