title: Django ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine
body: <p>I am using django with postgresql, whenever I try to save or delete anything, this error occurs - </p>
  
  <pre><code>Traceback (most recent call last):
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 138, in run
  self.finish_response()
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 180, in finish_response
  self.write(data)
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 274, in write
  self.send_headers()
  Not Found: /favicon.ico
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 332, in send_headers
  self.send_preamble()
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 255, in send_preamble
  ('Date: %s\r\n' % format_date_time(time.time())).encode('iso-8859-1')
  [02/Aug/2016 18:30:14] "GET /favicon.ico HTTP/1.1" 404 2044
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 453, in _write
  self.stdout.write(data)
  File "c:\program files (x86)\python35-32\Lib\socket.py", line 593, in write
  return self._sock.send(b)
  ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine
  [02/Aug/2016 18:30:14] "GET /api/delete/ HTTP/1.1" 500 59
  ----------------------------------------
  Exception happened during processing of request from ('127.0.0.1', 1712)
  Traceback (most recent call last):
   File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 138, in run
  self.finish_response()
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 180, in finish_response
  self.write(data)
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 274, in write
  self.send_headers()
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 332, in send_headers
  self.send_preamble()
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 255, in send_preamble
  ('Date: %s\r\n' % format_date_time(time.time())).encode('iso-8859-1')
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 453, in _write
  self.stdout.write(data)
  File "c:\program files (x86)\python35-32\Lib\socket.py", line 593, in write
  return self._sock.send(b)
  ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 141, in run
  self.handle_error()
  File "C:\Users\sushant\Desktop\projects\drfapi\venv\lib\site-packages\django\core\servers\basehttp.py", line 92, in handle_error
  super(ServerHandler, self).handle_error()
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 368, in handle_error
  self.finish_response()
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 180, in finish_response
  self.write(data)
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 274, in write
  self.send_headers()
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 331, in send_headers
  if not self.origin_server or self.client_is_modern():
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 344, in client_is_modern
  return self.environ['SERVER_PROTOCOL'].upper() != 'HTTP/0.9'
  TypeError: 'NoneType' object is not subscriptable
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
  File "c:\program files (x86)\python35-32\Lib\socketserver.py", line 628, in process_request_thread
  self.finish_request(request, client_address)
  File "c:\program files (x86)\python35-32\Lib\socketserver.py", line 357, in finish_request
  self.RequestHandlerClass(request, client_address, self)
  File "C:\Users\sushant\Desktop\projects\drfapi\venv\lib\site-packages\django\core\servers\basehttp.py", line 99, in __init__
  super(WSGIRequestHandler, self).__init__(*args, **kwargs)
  File "c:\program files (x86)\python35-32\Lib\socketserver.py", line 684, in __init__
  self.handle()
  File "C:\Users\sushant\Desktop\projects\drfapi\venv\lib\site-packages\django\core\servers\basehttp.py", line 179, in handle
  handler.run(self.server.get_app())
  File "c:\program files (x86)\python35-32\Lib\wsgiref\handlers.py", line 144, in run
  self.close()
  File "c:\program files (x86)\python35-32\Lib\wsgiref\simple_server.py", line 35, in close
  self.status.split(' ',1)[0], self.bytes_sent
  AttributeError: 'NoneType' object has no attribute 'split'
  ----------------------------------------
  </code></pre>
  
  <p>What happens is whenever a database save\delete command is there, it gets executed twice, first time without errors, second time, throwing this error and hence, save is done twice.</p>
  
  <p>What I understand is some program is blocking it(as the error says) so I removed the anti-virus that I had but with no conclusions.</p>
  
  <p>Does anyone have any idea what this is all about?</p>
  
  <p><strong>Edit</strong>: It's a Python bug, reported <a href="https://bugs.python.org/issue27682" rel="noreferrer">here</a></p>