I found it would be failed when initialize MeterLogger server with `http://` head.

[TuXiaokang]

i found it would be failed when initialize MeterLogger server with http:// head.

>>> a = MeterLogger(server="http://localhost", port=8097, env='hello')
>>> b = torch.Tensor([1])
>>> a.updateLoss(b, 'loss')
>>> a.resetMeter(mode='Train', iepoch=1)

Error message here

Exception in user code:
------------------------------------------------------------
Traceback (most recent call last):
  File "/home/txk/.local/lib/python3.6/site-packages/urllib3/connection.py", line 141, in _new_conn
    (self.host, self.port), self.timeout, **extra_kw)
  File "/home/txk/.local/lib/python3.6/site-packages/urllib3/util/connection.py", line 60, in create_connection
    for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
  File "/usr/lib/python3.6/socket.py", line 745, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/txk/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 601, in urlopen
    chunked=chunked)
  File "/home/txk/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 357, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/usr/lib/python3.6/http/client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/usr/lib/python3.6/http/client.py", line 964, in send
    self.connect()
  File "/home/txk/.local/lib/python3.6/site-packages/urllib3/connection.py", line 166, in connect
    conn = self._new_conn()
  File "/home/txk/.local/lib/python3.6/site-packages/urllib3/connection.py", line 150, in _new_conn
    self, "Failed to establish a new connection: %s" % e)
urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x7f6cc08ce198>: Failed to establish a new connection: [Errno -2] Name or service not known

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/txk/.local/lib/python3.6/site-packages/requests/adapters.py", line 440, in send
    timeout=timeout
  File "/home/txk/.local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 639, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "/home/txk/.local/lib/python3.6/site-packages/urllib3/util/retry.py", line 388, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='http', port=80): Max retries exceeded with url: //localhost:8097/events (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f6cc08ce198>: Failed to establish a new connection: [Errno -2] Name or service not known',))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/txk/.local/lib/python3.6/site-packages/visdom/__init__.py", line 261, in _send
    data=json.dumps(msg),
  File "/home/txk/.local/lib/python3.6/site-packages/requests/api.py", line 112, in post
    return request('post', url, data=data, json=json, **kwargs)
  File "/home/txk/.local/lib/python3.6/site-packages/requests/api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/txk/.local/lib/python3.6/site-packages/requests/sessions.py", line 508, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/txk/.local/lib/python3.6/site-packages/requests/sessions.py", line 618, in send
    r = adapter.send(request, **kwargs)
  File "/home/txk/.local/lib/python3.6/site-packages/requests/adapters.py", line 508, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='http', port=80): Max retries exceeded with url: //localhost:8097/events (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f6cc08ce198>: Failed to establish a new connection: [Errno -2] Name or service not known',))

[kuixu]

Yes, No need of “http://“, the MeterLogger provides the “http://“. just server=“localhost” is ok.

[TuXiaokang]

@barrykui but 'http://localhost' is the default value of server.

[kuixu]

Yes.
So if your visdom is running on localhost with the port 8097, just
a = MeterLogger(env='hello')

Only when the visdom is running on other server or other port, you should specify the IP address
and the port.

[TuXiaokang]

@barrykui i mean that the default value should be localhost instead of http://localhost.

[kuixu]

It is localhost in the code.

[alexsax]

Updated in #88