What information was incorrect, unhelpful, or incomplete?

When testing a website on non-standard ports, the 'redirection-to-https' test fails even if the site is already using HTTPS. In fact, a 400 'Bad Request' error message is returned because an HTTPS site is being requested over HTTP.
To reproduce the problem, you can try it on any site, here is an example:

npx @mdn/mdn-http-observatory 37.72.165.185:8443

Output:

[...]
"redirection": {
      "expectation": "redirection-to-https",
      "pass": false,
      "result": "redirection-missing",
      "scoreModifier": -20,
      "destination": "http://37.72.165.185:8443/",
      "redirects": false,
      "route": [
        "http://37.72.165.185:8443/"
      ],
      "statusCode": 400
[...]

What did you expect to see?

I expect that in cases where the tested website is already using HTTPS, the 'redirection-to-https' test will show a result of pass: true.

Do you have any supporting links, references, or citations?

No response

Do you have anything more you want to share?

No response