Unity 6 WebGL never loads due to .gz.zip etc not downloading?

both brotli and gzip running into issues where the Build file cannot be downloaded and thus webgl never loads?

Uncaught (in promise) Error: A listener indicated an asynchronous response by returning true, but the message channel closed before a response was received

v1a.loader.js:1 Failed to download file Build/v1a.data.gz

Did you configure the webserver to be the unity way? It requires some specific settings to be good.

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Yup, specifically compression needs to be enabled and configured on the server side, see here: