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What are the valid values for http header pragma . I know no-cache is one but i wnat to enable caching so what should i set it. I did some googleing and all that i got was most clients ignore this but no info on other values it accepts.
Surprisingly there is only one parameter defined by default, which is no-cache and no new Pragma directives will be defined in HTTP as per RFC.
ref: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.32
Moreover, you will need to use the Cache-Control header for managing the caching behaviors rather than the Pragma directive which seems to be still included only to support the legacy HTTP/1.0.
ref: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9
Bonus: http://www.mnot.net/cache_docs/