usage: ./ashttp.sh 'text/html;charset=utf-8' < index.html | nc -l 8080

ashttp.sh

#!/bin/sh


if [ $# -eq 0 ]; then
  mime='text/plain;charset=utf-8'
else
  mime="$1"
fi

CR=$'\x0d'

cat <<EOF | sed -e "s/\$/$CR/g"
HTTP/1.0 200 OK
Content-Type: $mime

EOF
cat

A toy HTTP Server

while true; do
  ./ashttp.sh 'text/html;charset=utf-8' < index.html | nc -l 8080
done