# Apache in .htaccess or httpd: The always directive in Apache ensures that a header is set even for error responses.
Header always set X-Xss-Protection "1; mode=block"
Header always set Strict-Transport-Security "max-age=63072000; includeSubDomains"
Header always set X-Content-Type-Options nosniff
Header always set Referrer-Policy same-origin
Header always set X-Frame-Options SAMEORIGIN

# and add customer specific:
Header always set Content-Security-Policy "default-src 'none'; base-uri 'none'; frame-src 'self'; connect-src 'self'; form-action 'self'; font-src 'self' data: https://fonts.googleapis.com https://fonts.gstatic.com; frame-ancestors 'self'; img-src 'self' data:; object-src 'none'; script-src 'self'; style-src 'unsafe-inline' 'self' data:; style-src-elem 'self' 'unsafe-inline' data: https://fonts.googleapis.com;"

Header always set Permissions-Policy geolocation=()

# Nginx: By default, Nginx only sets headers for successful responses (2xx, 3xx).
add_header X-Xss-Protection "1; mode=block" always;
add_header Strict-Transport-Security "max-age=63072000; includeSubDomains" always;
add_header X-Content-Type-Options nosniff always;
add_header Referrer-Policy same-origin always;
add_header X-Frame-Options SAMEORIGIN always;

# and add customer specific:
add_header Content-Security-Policy "default-src 'none'; base-uri 'none'; frame-src 'self'; connect-src 'self'; form-action 'self'; font-src 'self' data: https://fonts.googleapis.com https://fonts.gstatic.com; frame-ancestors 'self'; img-src 'self' data:; object-src 'none'; script-src 'self'; style-src 'unsafe-inline' 'self' data:; style-src-elem 'self' 'unsafe-inline' data: https://fonts.googleapis.com;" always;
add_header Permissions-Policy geolocation=() always;

#Notes:
# - Having an external frame-ancestor in CSP: X-Frame-Options "SAMEORIGIN" works
# - Chrome using F12 shows problems in yellow an red to fix.