javascript http request error

Καλησπέρα, χρησιμοποιώ το code sample σε javascript και λαμβάνω το ακόλουθο σφάλμα: Access to XMLHttpRequest at '' from origin 'null' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Χρειάζεται να προσθέσω κάτι επιπλέον ?

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