Etags - #4
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Firstly, here are some helpful resources for learning about etags: https://en.wikipedia.org/wiki/HTTP_ETag https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/ETag Etags are used to cache requests. If a browser sees an etag, it stores both the payload and the etag in its internal persistent memory. Now the next time it does the request, it asks the server whether the etag is still valid. If it is, the browser loads the cached image. If it is not valid then the server sends the image again.
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Firstly, here are some helpful resources for
learning about etags:
https://en.wikipedia.org/wiki/HTTP_ETag
https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/ETag
Etags are used to cache requests. If a browser
sees an etag, it stores both the payload and
the etag in its internal persistent memory.
Now the next time it does the request, it asks
the server whether the etag is still valid. If
it is, the browser loads the cached image. If
it is not valid then the server sends the image
again.