I think the reason is that you’re using the demo app for cors-anywhere (https://cors-anywhere.herokuapp.com), although it could be something to do with checking at the originating server end (it might not like the proxy). It’s severely rate-limited to ensure you can’t keep doing what you’re trying to do. It will allow a request through every so often. Most of the time,if you make repeated requests (normal when you’re seeing if something works), it won’t. If you want a CORs proxy, you could do worse than following the instructions he gives to deploy your own CORs proxy, or else find another service.
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