I have exported my godot4 project and am serving all the files with a web server but when I load everything I get an error:
Blocking on the main thread is very dangerous, see https://emscripten.org/docs/porting/pthreads.html#blocking-on-the-main-browser-thread

It looks like it's getting the wasm file:

This hangs forever and it needs a type that isn't a wasm file. This confuses me because it's fetching the same file twice but the second time it has a different type. I don't know how to make sense of this.

Apparently it fails at xhr.send(null)