1: https://tools.ietf.org/html/rfc7469#section-2.1.4
2: https://www.owasp.org/index.php/OWASP_Secure_Headers_Project...
1: https://tools.ietf.org/html/rfc7469#section-2.1.4
2: https://www.owasp.org/index.php/OWASP_Secure_Headers_Project...