I'm working on integrating some Qlik app elements in to a webpage, we have a Enterprise and QAP server. I'm trying to use the QAP to serve the elements, but I can't get in to the Dev-Hub on the QAP. I have seen references to an API call for the elements, but can't find any help page for QAP APIs.
Just to follow-up, we have what call a "origin whitelist" for websocket connections in Qlik Sense.
So in the virtual proxy you have the option of specifying which hosts are allowed to communicate with the proxy over websockets.
Since you probably installed the server and picked the default hostname that came with it that's the origin that has been applied as default. If you want to access via IP adress you would have to add that IP adress to the proxy as that is now a new Origin that is not present within the whitelist.