$ telnet example.com 80
GET /index.html HTTP/1.1
Host: example.com
then, press enter key twice.
You should a response similar to the one below:
HTTP/1.0 302 Found
Date: Tue, 23 Feb 2021 14:01:28 GMT
OpenBSD httpd
Connection: close
Content-Type: text/html
Content-Length: 486
Location: https://example.com/index.html
302 Found
302 Found
OpenBSD httpd
Connection closed by foreign host.