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HTTP caching: Where is cache.ETag's sister If-None-Match?

Question asked by hu2hugo on Apr 19, 2008
I have CPU-intensive webscripts that I want to avoid to run for nothing. ETag in the HTTP header could be very helpful. Unfortunately, I could not find a way to retrieve the value of If-None-Match in the RequestHeader. Is If-None-Match really inaccessible to webscripts? the same with If-Modified-Since?

Ooh, and if somebody knows how to change the default "Cache-Control: no-cache \n Pragma: no-cache" of webscripts HTTP headers, it would help a bit. The default kills the combination of Internet Explorer + SSL + XML + Flash.

Have a nice weekend,