HttpConditionalGet
HTTP method of only getting a URI if its contents have changed since a given date. (conditional HttpGet)
Last Modified, ETag, If Modified Since, If None Match
http://fishbowl.pastiche.org/2002/10/21/http_conditional_get_for_rss_hackers
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26
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