See for details: - https://httpsecurityreport.com/best_practice.html#hsts - https://securityheaders.io - https://scotthelme.co.uk/hsts-the-missing-link-in-tls/ - https://jvns.ca/blog/2017/04/30/using-strict-transport-security/ - https://habrahabr.ru/post/320164/ (in Russian)
