urllib3==1.14 AttributeError: 'bool' object has no attribute 'close'

client.py

#!/usr/bin/env python

import urllib3.poolmanager

pool = urllib3.poolmanager.HTTPConnectionPool('127.0.0.1', 9900)
resp = pool.urlopen('GET', '/', timeout=1)
print resp.data

server.py

#!/usr/bin/env python

import time
import socket

s = socket.socket()
s.bind(('', 9900))

while True:
    s.listen(1)
    cs, addr = s.accept()
    print cs.recv(65535)
    cs.send('''HTTP/1.0 200 OK\n\n''')
    time.sleep(3)
    cs.close()