#!/bin/bash

port=${1:-6789}

wrap_json='{"Message": "successful", "Success": true, "Code": 200, "Data":'
json=''
while content="$(printf "HTTP/1.1 200 OK\r\nContent-Length: %d\r\n\r\n%s" ${#json} "$json" | nc -l $port)"  ; do
  if echo "$content" | grep -q '^POST' && echo "$content" | tail -n 1 | grep -q '^{' ; then
    json="$wrap_json$(echo "$content" | tail -n 1)}"
    # echo "$json"
  fi
done