Merge pull request #2473 from mengbiping/postpone-connection

Respect response to CONNECT created in http_connect function in upstream mode

mitmproxy/proxy/protocol/http.py

@@ -217,6 +217,9 @@ class HttpLayer(base.Layer):
         return False
 
     def handle_upstream_connect(self, f):
+        # if the user specifies a response in the http_connect hook, we do not connect upstream here.
+        # https://github.com/mitmproxy/mitmproxy/pull/2473
+        if not f.response:
             self.establish_server_connection(
                 f.request.host,
                 f.request.port,