Is the HttpWebResponse.LastModified accurate? Is it always present? My project is to create a sort of a focused web crawler and I am stucked if I will use the hash value of a resource or just the HttpWebResponse.LastModified property to check the resource's "freshness".
Using the hash value means streaming the resource every time it's checked. This has a big impact on overall performance.
If I will just check the HttpWebResponse.LastModified, is it accurate?
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