postback_urlcan only be set to the webserver where the user's Kite application is running. So, in order to use postbacks, do I have to host my application in cloud? If so, is this because the postbacks are custom messages that a public server (like a blogging sites) cannot understand?
WARNING: This is a development server. Do not use it in a production deployment.In cloud, would I get a production WSGI server in the plan I choose?
Use a production WSGI server instead.