An issue with attempt to access

An issue with attempt to access

There is an issue with attempt to access. Attempt to access (from the other host than SDP server) by API to ServiceDesk (Windows version) ends with this statement:
The request to access from the other origin is blocked: rules "Same origin Policy" don't allow to load remote access fromz „http://servicedesk..../sdpapi/request”. ( the missing header CORS "Access-Control-Allow-Origin"). Can you share with the knowledge how to enable CORS?

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