Type a raw HTTP request into a TCP socket, read back a real 200 OK , then watch one wrong character kill it. No browser, no library. Prerequisites A Linux terminal (any distro; a VM is fine) bash or zsh Internet access Steps 1. Check for netcat and identify the variant. which nc && nc -h 2>&1 | head -1 Expect: a path such as /usr/bin/nc , then a line naming the build — OpenBSD netcat or Ncat 7.xx . Write down...