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docs: add trouble shooting section about file protocol #10231

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Sep 24, 2022
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docs: add trouble shooting section about file protocol #10231

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docs: add trouble shooting section about file protocol
sapphi-red Sep 24, 2022
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chore: apply suggestion
sapphi-red Sep 24, 2022
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14 changes: 14 additions & 0 deletions docs/guide/troubleshooting.md
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Expand Up @@ -76,6 +76,20 @@ If HMR is not handled by Vite or a plugin, a full reload will happen.

Also if there is a dependency loop, a full reload will happen. To solve this, try removing the loop.

## Build

### Built file does not work because of CORS error

If the HTML file output was opened with `file` protocol, the scripts won't run with the following error.

> Access to script at 'file:///foo/bar.js' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, isolated-app, chrome-extension, chrome, https, chrome-untrusted.

> Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at file:///foo/bar.js. (Reason: CORS request not http).

See [Reason: CORS request not HTTP - HTTP | MDN](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS/Errors/CORSRequestNotHttp) for more information about why this happens.

You will need to access the file with `http` protocol. The easiest way to achieve this is to run `npx vite preview`.

## Others

### Syntax Error / Type Error happens
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