title: Httplib2 exception raised when calling Twilio from python
body: <p>I'm trying to send an SMS message via Twilio from some Python code running in a Docker container.  The container was built from an Ubuntu image with Python 2.7 and the latest twilio-python helper library.  When calling the TwilioRestClient messages.create() function, I get the traceback below. Also, I have confirmed via curl that I can reach the url "api.twilio.com" as indicated in the traceback from this container. Any ideas?  </p>
  
  <p>Code being used...</p>
  
  <pre><code>import argparse
  import requests
  import time
  import smtplib
  from datetime import datetime
  from twilio.rest import TwilioRestClient
  
  def sendText( ToNumber, smsMsg):
  
  # put your own credentials here
  
  ACCOUNT_SID = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
  
  AUTH_TOKEN = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
  
  FromNumber = '+nnnnnnnnnnn'
  
  client = TwilioRestClient(ACCOUNT_SID, AUTH_TOKEN)
  
  client.messages.create(to = ToNumber,from_ = FromNumber,body = smsMsg,)
  
  return True
  </code></pre>
  
  <p>Traceback...</p>
  
  <pre><code>File "./siteminder3.py", line 15, in sendText
    message = client.messages.create(to=ToNumber,from_=FromNumber,body=smsMsg)
  File "/usr/local/lib/python2.7/dist-packages/twilio/rest/resources/messages.py", line 122, in create
    return self.create_instance(kwargs)
  File "/usr/local/lib/python2.7/dist-packages/twilio/rest/resources/base.py", line 365, in create_instance
    data=transform_params(body))
  File "/usr/local/lib/python2.7/dist-packages/twilio/rest/resources/base.py", line 200, in request
    resp = make_twilio_request(method, uri, auth=self.auth, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/twilio/rest/resources/base.py", line 152, in make_twilio_request
    resp = make_request(method, uri, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/twilio/rest/resources/base.py", line 117, in make_request
    resp, content = http.request(url, method, headers=headers, body=data)
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 1609, in request
    (response, content) = self._request(conn, authority, uri, request_uri, method, body, headers, redirections, cachekey)
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 1351, in _request
    (response, content) = self._conn_request(conn, request_uri, method, body, headers)
  File "/usr/local/lib/python2.7/dist-packages/httplib2/__init__.py", line 1278, in _conn_request
    raise ServerNotFoundError("Unable to find the server at %s" % conn.host)
  httplib2.ServerNotFoundError: Unable to find the server at api.twilio.com
  </code></pre>