The objective of Let’s Encrypt and the ACME protocol is to make it possible to set up an HTTPS server and have it automatically obtain a browser-trusted certificate, without any human intervention. This is accomplished by running a certificate management agent on the web server.
https://letsencrypt.org/how-it-works/
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https://letsencrypt.org/how-it-works/
Switch to HTTPS Now, For Free
https://konklone.com/post/switch-to-https-now-for-free
https://www.startssl.com/Support?v=1