server.conf

# Inside the server {} block

location @imgproxy {
    proxy_ssl_server_name on;
    proxy_ssl_name imgproxy.ondigitalocean.app;

    proxy_set_header Host imgproxy.ondigitalocean.app;
    proxy_set_header If-Modified-Since "";
    proxy_set_header ETag "";
    proxy_set_header Cache-Control "";

    proxy_ignore_headers Cache-Control;
    proxy_ignore_headers Set-Cookie;
    proxy_ignore_headers Expires;
    proxy_ignore_headers X-Accel-Expires;

    proxy_cache_key $scheme$proxy_host$request_uri$webp_suffix;
    proxy_cache imgproxy;
    proxy_pass https://imgproxy.ondigitalocean.app:443;

    rewrite ^.+$ /insecure/plain/$scheme://$http_host$uri$webp_suffix break;
}

location ~ \.(jpe?g|png|webp|avif|gif|ico|svg|heic|bmp|tiff) {
    error_page 418 = @imgproxy;
    recursive_error_pages on;

    if ( !-f $request_filename ) {
        break;
    }

    add_header Vary Accept;

    # Avoid recursive requests.
    if ( $imgproxy != 1 ) {
        return 418;
    }
}