Trap handler

#!/usr/bin/env bash

set -eu

trap 'pkill -f nc || true' EXIT

trap exit SIGINT SIGTERM

stop() {

  trap - SIGINT EXIT

  { pkill -f nc || true } 2>/dev/null

}

trap 'stop' EXIT SIGINT SIGTERM SIGHUP

if [[ "$2" == "/"* ]]; then

  while true ; do

    nc -lp "${1:-5000}" -e "$2" >/dev/null 2>&1 & wait $!

    nc -lp "${1:-5000}" -e "$2" & wait $!

  done

else

  RESPONSE="HTTP/1.1 200 OK\nContent-Length: ${LENGTH}\nConnection: close\n\n$HTML\n\n"

  while true; do

    echo -en "$RESPONSE" | nc -lp "${1:-5000}" >/dev/null 2>&1 & wait $!

    echo -en "$RESPONSE" | nc -lp "${1:-5000}" & wait $!

  done

fi