httpなら許してくれるっぽい
$ curl -IL http:// certifi.io/
HTTP/1.1 301 Moved Permanently
Server: nginx/1.10.3 (Ubuntu)
Date: Mon, 01 Nov 2021 00:33:16 GMT
Content-Type: text/html
Content-Length: 194
Connection: keep-alive
Location: https:// certifi.io/
HTTP/1.1 403 Forbidden
Server: nginx/1.10.3 (Ubuntu)
Date: Mon, 01 Nov 2021 00:33:18 GMT
Content-Type: text/html
Content-Length: 151
Connection: keep-alive
CF-RAY: ********-CDG