developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-None-Match

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      The HTTP If-None-Match request header makes a request conditional. The server returns the requested resource in GET and HEAD methods with a 200 status, only if it doesn't have an ETag matching the ones in the If-None-Match header. For other methods, the request will be processed only if the eventually existing resource's ETag doesn't match any of the values listed.

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