Caddy - Setting HTTPS on local domain - https

Question

I would like to add HTTPS to my local domain, however we can't do this on localhost.
My website goes fine when I run with this Caddyfile
localhost:2020 {
bind {$ADDRESS}
proxy / http://192.168.100.82:9000 {
transparent
}
}
But I would like to name this website or at least enable HTTPS on it. According to Caddy, you can't do this on localhost, but what if I have a domain name ?
I have tried using my own local address with this Caddyfile
192.168.100.26 {
bind {$ADDRESS}
proxy / http://192.168.100.82:9000 {
transparent
}
}
All works fine but I still don't have HTTPS...
And when I try to add a random domain name for example
www.mycaddytest.com {
bind {$ADDRESS}
proxy / http://192.168.100.82:9000 {
transparent
}
}
I got the following error
Activating privacy features...2016/08/18 11:53:26 [www.mycaddytest.com] failed to get certificate: acme: Error 400 - urn:acme:error:connection - DNS problem: NXDOMAIN looking up A for www.mycaddytest.com
Error Detail:
Validation for www.mycaddytest.com:80
Resolved to:
Used:
I know this error is dues to an unexisting domain name, but is there a way to deal with ?
Just getting HTTPS on localhost or ip address will be enough

Answer 1

Since Caddy 0.9 we can use the tls self_signed attribute.
Use this Caddyfile
localhost:2020 {
bind {$ADDRESS}
proxy / 192.168.100.82:9000
tls self_signed
}
And try https://localhost:2020

Answer 2

For caddy version 2.4.5, the accepted answer did not work me. What worked is shown below:
localhost:443 {
reverse_proxy 127.0.0.1:8080
tls internal
}

Answer 3

I know that answer is already accepted. But I had the same problem with Caddy v0.10.14 and it's a solution that helped me (but with real SSL certificate instead of self_signed):
Firstly, certificate & key pair must be in this directories: /etc/pki/tls/certs/ for certificate and /etc/pki/tls/private/ for key. So go to one of this directory with cd command
Then, create our own, self-signed certificate for HTTP2.0 testing with a single command, however. Just execute on your commandline to generate a SSL certificate + key pair:
openssl req -new -newkey rsa:2048 -sha256 -days 365 -nodes -x509 -keyout cert.key -out cert.crt
After that, move files to correct directories (see the first point)
Next, use this Caddyfile and try https://localhost:2020:
localhost:2020 {
bind {$ADDRESS}
root /var/www
gzip
tls your.address#example.com
tls /etc/pki/tls/certs/cert.crt /etc/pki/tls/private/cert.key
}

Answer 4

Also if you are running caddy in a docker container, you may need to import and trust the Root certificate.
docker ps
docker cp container_id:/config/caddy/pki/authorities/local/root.crt ~/Desktop
then the caddyfile, for laravel sail for example, could look something like this:
yourlocaldomain.dev{
tls internal
reverse_proxy laravel.test
}
more may be here https://gilbitron.me/blog/enabling-https-ssl-for-laravel-sail-using-caddy/