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It turned out that I had to enable CORS for my own port and domain, I run ktor on `localhost:5000` and I had to enable CORS for `localhost:5000` as well, which seems weird to me. I did not get the usual `CORS not allowed header blabla` just a `403`

If you have `Origin` in http headers and CORS is enabled, then ktor will check if method is allowed. Default methods are GET, HEAD and POST. If you allow other methods with CORS-control, you need to add `method(HttpMethod.Put)` to CORS configuration.