Another cache control setting is the “Last Modified” HTTP header. Servers have a timestamp of the last modified date for each file; after the first file loading, client has the ability to ask the server if the resource has been modified since the specific moment the files was last accessed by the client.
To do this, the browser sends If-Modified-Since: Fri, 13 Jul 2018 10:49:23 GMT in the HTTP header. If the resource has been modified, the browser has to download a new file, otherwise it uses a cached version.
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