privacyguides.org/nginx/010-headers.conf

add_header X-Frame-Options DENY always;
add_header X-XSS-Protection "1; mode=block" always;
add_header X-Content-Type-Options nosniff always;
add_header Content-Security-Policy "default-src 'none'; script-src 'self' https://stats.privacytools.io; style-src 'self'; img-src 'self' data: https://*.privacytools.io; object-src 'none'; frame-src https://stats.privacytools.io; font-src 'self'; base-uri 'none'; form-action 'self' https://search.privacytools.io; frame-ancestors 'none'; manifest-src 'self';" always;
add_header Strict-Transport-Security "max-age=31557600; includeSubDomains; preload";
add_header Alt-Svc 'h2="privacy2zbidut4m4jyj3ksdqidzkw3uoip2vhvhbvwxbqux5xy5obyd.onion:443"; ma=86400; persist=1';
add_header Expect-CT 'max-age=86400, enforce';
add_header Referrer-Policy "strict-origin";
add_header Feature-Policy "geolocation none;midi none;notifications none;push none;sync-xhr none;microphone none;camera none;magnetometer none;gyroscope none;speaker self;vibrate none;fullscreen self;payment none;";