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Any server you’re sending a request to will, usually by default, reject it if it contains headers which are not CORS-safelisted.
window.axios.defaults.headers.common['X-Requested-With'] = 'XMLHttpRequest';
This code tells axios to attach a custom header to every request. Ergo, your request is being sent with a non safelisted header, which the server won’t permit, so you receive the error.
To permit the request, the server must be configured to allow the custom header.
Source:stackexchange.com