https://www.sylvaindurand.fr/wildcard-certificates-with-letsencrypt/
https://mozilla.github.io/server-side-tls/ssl-config-generator/
https://hstspreload.org/
https://makina-corpus.com/blog/metier/2016/introduction-progressive-web-apps
https://michael.lustfield.net/nginx/getting-a-perfect-ssl-labs-score
https://www.ssllabs.com/ssltest/analyze.html
https://certbot.eff.org/
https://github.com/Neilpang/le
https://letsencrypt.org/