c# - HttpWebResponse LastModified -

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is httpwebresponse.lastmodified accurate? present? project create sort of focused web crawler , stucked if use hash value of resource or httpwebresponse.lastmodified property check resource's "freshness".

using hash value means streaming resource every time it's checked. has big impact on overall performance.

if check httpwebresponse.lastmodified, accurate?

httpwebresponse.lastmodified returns value of http last-modified response header.

http response headers set http server sending response. it's server if sets last-modified response header, , whether sets accurate value or not.

the last-modified response header part of validation model caching in http. used in conjunction if-modified-since request header. might want read http/1.1, part 6: caching details.


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