INFO:tornado.access:200 GET / (127.0.0.1) 0.40ms
INFO:tornado.access:200 GET / (127.0.0.1) 0.43ms
DEBUG:grab.network:[13] GET http://127.0.0.1:9876/
INFO:tornado.access:200 GET / (127.0.0.1) 0.35ms
...Exception in thread Thread-12:
Traceback (most recent call last):
  File "/Users/im/anaconda/lib/python2.7/threading.py", line 810, in __bootstrap_inner
    self.run()
  File "/Users/im/anaconda/lib/python2.7/threading.py", line 763, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/Users/im/anaconda/lib/python2.7/site-packages/test_server/server.py", line 195, in main_loop_function
    server.listen(port, self.address)
  File "/Users/im/anaconda/lib/python2.7/site-packages/tornado/tcpserver.py", line 126, in listen
    self.add_sockets(sockets)
  File "/Users/im/anaconda/lib/python2.7/site-packages/tornado/tcpserver.py", line 143, in add_sockets
    io_loop=self.io_loop)
  File "/Users/im/anaconda/lib/python2.7/site-packages/tornado/netutil.py", line 224, in add_accept_handler
    io_loop.add_handler(sock, accept_handler, IOLoop.READ)
  File "/Users/im/anaconda/lib/python2.7/site-packages/tornado/ioloop.py", line 680, in add_handler
    self._impl.register(fd, events | self.ERROR)
  File "/Users/im/anaconda/lib/python2.7/site-packages/tornado/platform/kqueue.py", line 40, in register
    raise IOError("fd %s already registered" % fd)
IOError: fd 3 already registered

DEBUG:grab.network:[14] GET http://127.0.0.1:9876/