-As of NixOS 19.09, the nginx package in Nixpkgs is patched such that when nginx serves a file out of `/nix/store`, the hash in the store path is used as the `ETag` header in the HTTP response, thus providing proper caching functionality. With NixOS 24.05 and later, the `ETag` additionally includes the response content length, to ensure files served with static compression do not share `ETag`s with their uncompressed version. This `ETag` functionality is enabled automatically; you do not need to do modify any configuration to get this behavior.
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