I wanted to add it but I&#x27;ve seen all these warnings on the Internet about it and I&#x27;m not so sure I will be able to manage it if it does not work as expected. I&#x27;ve added X-Frame-Options, Strict-Transport-Security, X-Xss-Protection and X-Content-Type-Options because they have very few side-effects but I&#x27;m a bit afraid of HPKP.