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Competitive Companion blocked by new Chromium local network access restrictions #79

@ShelpAm

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@ShelpAm

Chromium recently introduced a feature [Local network access restrictions](https://chromestatus.com/feature/5152728072060928), which breaks Competitive Companion.

Specifically, whenever I press the green button in the browser, it throws the following error:

Access to fetch at 'http://localhost:27121/' from origin 'chrome-extension://cjnmckjndlpiamhfimnnjmnckgghkjbl' has been blocked by CORS policy: Permission was denied for this request to access the `unknown` address space.

After some investigation, it seems that this is related to Chromium’s local network restrictions. I believe the server needs to set Access-Control-Allow-Origin or similar headers to allow the extension to communicate.

My browser version: 141.0.3500.1 (Official build) dev (64-bit)
My Neovim version: NVIM v0.11.3

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