def _send_request(self, method, url, body, headers):
self._response_received = False
if headers.get('Expect', '') == '100-continue':
self._expect_header_set = True
else:
self._expect_header_set = False
self.response_class = self._original_response_cls
rval = HTTPConnection._send_request(
self, method, url, body, headers)
self._expect_header_set = False
return rval
