[Python] connect javascript client to python websocket server

I have this working python websocket server:

#!/usr/bin/env python
from socket import *

HOST = ''
PORT = 8080
BUFSIZ = 1024
ADDR = (HOST, PORT)

tcpSerSock = socket(AF_INET, SOCK_STREAM)
tcpSerSock.bind(ADDR)
tcpSerSock.listen(5)

def loop():
while True:
print 'Waiting for connection...'
tcpCliSock, addr = tcpSerSock.accept()
print '...connected from :', addr
while True:
data = tcpCliSock.recv(BUFSIZ)
if not data:
break
else:
print 'data: ',data
tcpSerSock.close()

try:
loop()
except KeyboardInterrupt:
tcpSerSock.close()


when I connect from the python client it works even if when I close the client the server crashes:

Waiting for connection...
Traceback (most recent call last):
File "ledServer.py", line 27, in <module>
loop()
File "ledServer.py", line 16, in loop
tcpCliSock, addr = tcpSerSock.accept()
File "/usr/lib/python2.7/socket.py", line 202, in accept
sock, addr = self._sock.accept()
File "/usr/lib/python2.7/socket.py", line 170, in _dummy
raise error(EBADF, 'Bad file descriptor')
socket.error: [Errno 9] Bad file descriptor


anyway when I run this javascript client:

window.onload = function(){
ws = new WebSocket('ws://192.168.25.7:8080');
ws.onmessage = function(event){document.write("message received"); alert(event.data); ws.close();}
ws.onopen = function(){document.write("open");}
ws.onclose = function(){document.write("close");}
ws.onerror = function(){document.write("error");}
}


I get this on the server:

...connected from : ('192.168.25.25', 53747)
data: GET / HTTP/1.1
Host: 192.168.25.7:8080
Connection: Upgrade
Pragma: no-cache
Cache-Control: no-cache
Upgrade: websocket
Origin: file://
Sec-WebSocket-Version: 13
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36
Accept-Encoding: gzip, deflate
Accept-Language: it-IT,it;q=0.9,en-US;q=0.8,en;q=0.7,tr;q=0.6,nl;q=0.5
Sec-WebSocket-Key: pH4kNOzz1MYyi+oXmaFCcA==
Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits


but even if the server says it is connected, on the client the onopen function is not executed, Chrome says that websocket status is "pending", and if I try to send a message to the server, I get:

Uncaught DOMException: Failed to execute 'send' on 'WebSocket': Still in CONNECTING state.


What am I doing wrong?

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