curl: how to specify target hostname for https request

Question

I have a x.example which serves traffic for both a.example and b.example. x.example has certificates for both a.exa

Answer 1

The selected answer helped me find the answer, even though it does not contain the answer. The answer in the mail/archive link Patrick Mevzek provided has the wrong port number. So even following that answer will cause it to continue to fail.

I used this container to run a debugging server to inspect the requests. I highly suggest anyone debugging this kind of issue do the same.

Here is how to address the OP's question.

# Instead of this:
# curl --header 'Host: a.example'        https://x.example

# Do:
  host=a.example
  target=x.example

  ip=$(dig +short $target | head -n1)
  curl -sv   --resolve $host:443:$ip https://$host

If you want to ignore bad certificates matches, use -svk instead of -sv

curl -svk --resolve $host:443:$ip https://$host

Note: Since you are using https, you must use 443 in the --resolve argument instead of 80 as was stated on the mail/archive