This is the Onvif Uplink test bed. It handles the h2c-reverse and websocket h2c-reverse protocols.
You should have been provided the URL to connect to already. You may point your Onvif Device to it right away.
The Uplink has no authentication and will send a series of commands to any device that connects to it.
If your device received a 'GET /all_tests_completed_successfully' then everything worked! No need to reply properly to that request. A 404 will do just fine.