Thread: Simple view on how proxies work (inc DNS)
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Old 15-03-2004, 17:03   #28
SMHarman
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Re: Simple view on how proxies work (inc DNS)
Quote:
Originally Posted by danielf
Ah, that makes sense, as I was wondering if the proxy had to query for a more recent page, which would increase traffic and defeat the purpose of the proxy unless you only have to retrieve the time stamp of the most recent page.

I presume this expiry time/date is set differently depending on the type of page? (very low for a forum like this) and high(er) for less dynamic pages)?

Or is it just based on recent 'refresh rates'?
Http also has a HEAD command and a GET command. GET asks for the whole page, HEAD asks for the headers, which can be used to compare to the cached headers. Head uses a lot less bandwidth as a result.
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