is the c# webbrowser reliable?

Question

I try attaching certain custom document events but they fire sometime; sometimes they don't.

Worse, here is a scenario that you can test. I am not sure if this is my OS problem. Its a win7 machine, and it has IE 11 installed.

I start a localhost python web server and serve a static web page:

C:\code\forex> python -m SimpleHTTPServer 4542

And try to load the above web page in the webbrowser control. So my form's code is somewhat as follows:

using System;
using System.Diagnostics;
using System.Windows.Forms;

namespace winformWebBrowser
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

            webBrowser1.DocumentCompleted += webBrowser1_DocumentCompleted;            
            webBrowser1.Navigate("http://localhost:4542");

        }

        void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            if (webBrowser1.ReadyState == WebBrowserReadyState.Complete)
            {
                Debug.Print("Ready");
            }
        }
    }
}

I get the Ready message. But once I close the form, the local web server is also broken as a result.

PS C:\code\forex> python -m SimpleHTTPServer 4542
Serving HTTP on 0.0.0.0 port 4542 ...
127.0.0.1 - - [10/Jun/2015 19:06:42] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [10/Jun/2015 19:12:01] "GET / HTTP/1.1" 200 -
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 29758)
Traceback (most recent call last):
  File "C:\Python27\lib\SocketServer.py", line 295, in _handle_request_noblock
    self.process_request(request, client_address)
  File "C:\Python27\lib\SocketServer.py", line 321, in process_request
    self.finish_request(request, client_address)
  File "C:\Python27\lib\SocketServer.py", line 334, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "C:\Python27\lib\SocketServer.py", line 655, in __init__
    self.handle()
  File "C:\Python27\lib\BaseHTTPServer.py", line 340, in handle
    self.handle_one_request()
  File "C:\Python27\lib\BaseHTTPServer.py", line 310, in handle_one_request
    self.raw_requestline = self.rfile.readline(65537)
  File "C:\Python27\lib\socket.py", line 476, in readline
    data = self._sock.recv(self._rbufsize)
error: [Errno 10054] An existing connection was forcibly closed by the remote ho
st
----------------------------------------

So my question is does the webbrowser control work properly?