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How to CORS for function's custom domain?
TL;DR
To enable CORS for a function with a custom domain, developers need to manually add the CORS headers to their response. An example of allowing all origins is:
```js
return res.json(response, 200, {'Access-Control-Allow-Origin': '*'});
```
For project-level custom domains, CORS is handled by the combination of the hostname and platform. Developers must add the necessary CORS headers to their function's response for CORS to work properly.
