How do I get automatic HTTPS on an IP address?

I’m struggling with a basic configuration. Basically, I would like to get HTTPS over (my website is in a Docker container). Somehow, with the following configuration, I can have HTTP but not HTTPS:
root /home/sendo/public
fastcgi / php
rewrite {
    regexp .*
    ext /
    to /index.php?{query}

log stdout
errors stdout
on startup php-fpm --nodaemonize

I read this documentation, so I guessed I only had to add https before but now i get this error:

This site can’t provide a secure connection sent an invalid response.

and the website isn’t even available in HTTPS.

What am I missing?

Thank you in advance for your answers

Update: This is old info. Caddy 2 will provision its own certificate for your IP addresses.

From the automatic HTTPS docs page:

Caddy automatically enables HTTPS for all your sites, given that some reasonable criteria are met:

  • The hostname:
    • is not an IP address

Since you can’t (practically) get a publicly-trusted certificate for an IP address, you will have to roll your own – but it won’t be trusted in browsers. And isn’t a valid IP either, it’s just kind of a wildcard for “anything on this IPv4 interface.”

If you don’t know which domains you’ll be serving, you need to enable on-demand TLS using the tls directive’s ask subdirective (don’t use max_certs, we’re deprecating it next week):

As an addendum to Matt Holt’s advice, if you need HTTPS, you can get a non-trusted, self-signed certificate for an IP address (it’s just not compatible with the Automatic HTTPS feature).

You’ll need to use tls self_signed to do that. You’ll also probably want to set the port and HTTP(S) redirection up manually - normally, Automatic HTTPS does that for you.

Feature request: wouldn’t it be great if one could set the expiry to something else than 7 days?? It saves someone from having to generate their own self-signed key/certificate, and has the same effect as self_signed (unless I misunderstand what self_signed does).

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Yeah, Caddy 2 will let you do this.

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Thanks for your reply, I guess I have no other choice than using a Caddy proxy outside the Docker container (which is cool anyway)

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