Etag (Entity tag)
Etag is one of the cache settings. The main idea behind this HTTP header is to allow your browser to be aware of modifications to relevant resources without downloading full files.
The server could calculate something similar with hash sum of each file and then send this hash sum to the client. The next time the client tries to access this resource, instead of downloading the file, the browser will send something like this in the HTTP header: If-None-Match: W/“1d2e7–1648e509289”
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