A cartoon drawing sitting by a big screen with the words seo written with an open laptop browsing simba academy for seo dictionary terms
A cartoon drawing sitting by a big screen with the words seo written with an open laptop browsing simba academy for Simba's SEO dictionary terms
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What is “If Modified Since”?

If Modified Since is The if modified since header is an HTTP header that is sent to a server as a conditional request. If the content has not changed the server responds by providing only the headers with a 304 status code. If the content has changed the server responds to the request with a 200 status code and the entire requested document / resource.  

From Simba’s SEO Dictionary

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