def connect(self, host, port, scheme='http', timeout=None):
if timeout is not None:
# this parameter is deprecated
self.timeout = None
if self.client and not self.client.is_closed():
self.client.close()
if scheme == 'http':
self.client = Client()
elif scheme == 'https':
self.client = SSLClient()
else:
raise HttpException('unsupported url scheme %s' % scheme)
self.scheme = scheme
self.host = host
self.port = port
self.client.timeout = self._timeout
yield self.client.connect(self.host, self.port)
