pass kwargs from send call to add_headers, per documentation
@@ -411,7 +411,7 @@ class HTTPAdapter(BaseAdapter):
self.cert_verify(conn, request.url, verify, cert)
url = self.request_url(request, proxies)
- self.add_headers(request)
+ self.add_headers(request, stream=stream, timeout=timeout, verify=verify, cert=cert, proxies=proxies)
chunked = not (request.body is None or 'Content-Length' in request.headers)
