I appreciate wanting something uncomplicated and with no dependencies, but unfortunately if you want to do this you need something like my edgebridge app (same thing as ‘Forwarding bridge Server’) and LAN Trigger driver. Webrequestor does not help with what you want to do: it is for sending requests OUT of the hub.
The reason you need this extra bit of complexity is this: Edge drivers do not have fixed port numbers. So if you were using a browser, you would not know what port number to send the request to at your hub’s IP address. Even if you did figure out what port number the driver was using, it can change whenever your hub is rebooted.
See the edgebridge link above, and/or this community topic: