I want to my web.js can deliever message to another server(by c++),but it didn't work

Here is my web.js，I want it can send message to another server(coding by c++) when it get POST from a.php

web.js:

var http=require('http');
var express=require('express');
var fs=require('fs');
var net=require('net');
var app=express();
var server=http.createServer(app);

app.use(express.static(__dirname + '/public'));
app.use(express.bodyParser());
app.use(express.json());

app.post('/',function(req,res){
                var HOST='127.0.0.1';
                var PORT=9011;
                var client=new net.Socket();
                client.connect(PORT, HOST, function() {
                                console.log('Client Sent');
                                client.write('YO WTF');//Send message
                });
                req.on('error', function(e) {
                console.lo`enter code here`g('fuck');
        });
});

server.listen(7000,function(){
        console.log('Web.js is listening at port 7000');
});

Maybe the problem is I use json ? or c++ should do something to handle json string??

it didn't work ,I don't know why,Please help me,thanks~