Comment by simonw

Neat, works against example.com

  exec 3<>/dev/tcp/example.com/80
  printf 'GET / HTTP/1.1\r\nHost: example.com\r\nConnection: close\r\n\r\n' >&3
  cat <&3

Outputs:

  HTTP/1.1 200 OK
  Date: Tue, 16 Jun 2026 17:37:45 GMT
  Content-Type: text/html
  ...

I always end up on example.com for this kind of thing because there are so few domains these days that don't enforce https!