We have been issuing and automatically installing Let's Encrypt® certificates for a while now. The only manual thing was the trigger of this process. But today, we are glad to announce fully automated Let's Encrypt certificates for everyone!
To protect your web app or API, there is almost only one way at this time: TLS. But users
and browsers don't always use TLS by default. So what you want is to redirect them to a
TLS encrypted version of your site if they try to connect via plain http.