A web page can't reach a Roku on its own. The bridge is one small Python file that runs on a computer on the same Wi-Fi as your Roku and passes messages along. Three steps:
start-roku-relay.cmd. Mac or Linux: ROKU_RELAY_PORT=8100 python3 roku_relay.py. It finds the Roku by itself.http://192.168.1.20:8100, and press Connect. On a phone, open that address directly instead.{}