Opens a socket connection to the server to set up an HTTP request.
    
    Args:
      uri: The full URL for the request as a Uri object.
      headers: A dict of string pairs containing the HTTP headers for the
          request.

def _get_connection(self, uri, headers=None):
    """Opens a socket connection to the server to set up an HTTP request.
    
    Args:
      uri: The full URL for the request as a Uri object.
      headers: A dict of string pairs containing the HTTP headers for the
          request.
    """
    connection = None
    if uri.scheme == 'https':
      if not uri.port:
        connection = httplib.HTTPSConnection(uri.host)
      else:
        connection = httplib.HTTPSConnection(uri.host, int(uri.port))
    else:
      if not uri.port:
        connection = httplib.HTTPConnection(uri.host)
      else:
        connection = httplib.HTTPConnection(uri.host, int(uri.port))
    return connection