coherence SDK supports networking in WebGL without any additional setup. Both Rooms and Worlds are supported.
WebGL builds use webrtc to connect to the Replication Server and so the ports used to connect are different from the usual UDP ports. This is managed automatically in the sample connect dialogs, but if you are building your own, you need to make sure you're connecting to the the correct port which is specified by the --signalling-port when starting the Replication Server locally (defaults to 42002 for Rooms and 32002 for Worlds).
This is resolved automatically when using the PlayResolver to create and join Rooms and Worlds.

Linux builds

For anyone building WebGL in Linux: you need to install these packages: sudo apt install clang libtinfo5 python python-setuptools

Running locally

For running a WebGL build locally, please refer to the official Unity documentation.
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Linux builds
Running locally