Receiving POST data in React HTTP Server

[NotionCommotion]

GET data seems pretty straight forward, but not so with POST data.  It seems to work, however, that does not necessarily mean it is right.  Am I doing it right?  Thanks

<?php
require 'vendor/autoload.php';
use React\EventLoop\Factory;
use React\Http\Server as HttpServer;
use React\Socket\Server as SocketServer;

set_time_limit(0);

$port='1337';
//$host='0.0.0.0';
//$host='127.0.0.1';
$host='192.168.1.200';
//$host='192.168.1.201';

$loop = Factory::create();
$http_socket = new SocketServer($loop);
$http = new HttpServer($http_socket);
$http->on('request', function ($request, $response) {
    switch($request->getMethod()) {
        case 'GET':
            $response->writeHead(200, array('Content-Type' => 'text/plain'));
            $query = $request->getQuery();
            echo print_r($query,1) . PHP_EOL;
            $response->end(print_r($query,1));
            break;
        case 'POST':
            $requestBody = '';
            $headers = $request->getHeaders();
            $contentLength = (int)$headers['Content-Length'];
            $receivedData = 0;
            $request->on('data',function($data) use ($request, $response, &$requestBody, &$receivedData, $contentLength) {
                $requestBody.=$data;
                $receivedData+=strlen($data);
                if ($receivedData>=$contentLength) {
                    parse_str($requestBody, $query);
                    $response->writeHead(200, array('Content-Type' => 'text/plain'));
                    echo print_r($query,1) . PHP_EOL;
                    $response->end(print_r($query,1));
                }
            });
            break;
    }
});


$http_socket->listen($port, $host);
$loop->run();

Edited December 30, 2016 by NotionCommotion