That's a very strange example to use, when example.com does support HTTP:

    $ telnet example.com 80
    Trying 2606:2800:220:1:248:1893:25c8:1946...
    Connected to example.com.
    Escape character is '^]'.
    GET /index.html HTTP/1.1
    Host: example.com

    HTTP/1.1 200 OK
    ...
    Content-Length: 1256
    ...