# Rails asset pipeline & webpacker support.
location ~ "^/(assets|packs)/.+-([0-9a-f]{32}|[0-9a-f]{64}|[0-9a-f]{20}|[0-9a-f]{8})\..+" {
    error_page 490 = @static_asset;
    error_page 491 = @dynamic_request;
    recursive_error_pages on;

    if (-f $request_filename) {
        return 490;
    }
    if (!-f $request_filename) {
        return 491;
    }
}
location @static_asset {
    gzip_static on;
    expires max;
    add_header Cache-Control public;
    add_header ETag "";
}
location @dynamic_request {
    passenger_enabled on;
}