Back-end. Your HTTP server needs to add the Cache-Control HTTP header in the response to no-cache. This is sufficient so long your HTTP server calculates and sends the ETag header. Then you'll be in the ideal position.
Nginx calculates ETag's by default, I think, so it is a matter of adding the HTTP header. If you're not using Nginx to server your website, you need to search on how to do this in your server of choice.
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for setting for assests url, do we need to set from frontend or backend (server side) ?
Back-end. Your HTTP server needs to add the
Cache-ControlHTTP header in the response tono-cache. This is sufficient so long your HTTP server calculates and sends theETagheader. Then you'll be in the ideal position.Nginx calculates ETag's by default, I think, so it is a matter of adding the HTTP header. If you're not using Nginx to server your website, you need to search on how to do this in your server of choice.