I think I figured out, I have to go to Extension Dashboard -> version -> Asset Hosting.
Then change the port in one of the text box, which was defaulted to https://localhost.rig.twitch.tv:8080.
After this is done, restart the developer rig, then click the button on the bottom of project overview “Refresh Manifest”.
It did not work in the first time, but I think was too quick switching the tabs and trying to test.
It worked the 2nd time.