HTTP Header - If-Modified-Since

1 - About

If-Modified-Since is a request HTTP header that make the creation of the response body conditional.

If the requested resource has not been modified since the time specified in this field, a 304 (not modified) status response is returned without any message-body.

In other words, it tell Crawlers if the content has changed since the last crawl.

Supporting this feature saves:

3 - Documentation / Reference


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