CORS

CORS stands for Cross-Origin Resource Sharing. It's a security feature that allows your browser to make requests to a different domain than the one that served the original page, but if you're on this page it means you're probably running into a CORS issue.

If you're trying to use the fetch API to make a request to Buttondown and getting back a CORS error, you've got one of two options:

1. Use a proxy
2. Use a service worker to bypass the CORS restriction
3. Set the mode to no-cors when making the request. (This is unsafe and will break things like cookies, so don't do it unless you have a really good reason.)