Bypassing CORS using Netlify _redirects

You need a file called _redirects in your publish directory.

In your _redirects file, you can do something as simple as:

/rewrite/*	https://:splat	200

Anything after the /rewrite/ is now fetched by Netlify’s servers, acting like a little proxy.

Now anything in your HTML that was trying to, say, fetch from another server which was bringing up a CORS error, can instead look like it’s fetching something local:

// not this:
const response = await fetch("https://example.com");

// this!:
const response = await fetch("/rewrite/example.com");

More info at Rewrites and proxies | Netlify Docs.