3768104 - "Request header field firefly-invalidate-caches is not allowed by Access-Control-Allow-Headers in preflight response." in SAP Analytics Cloud

When opening a SAC story based on a BW live data model, the following CORS error can be found in the console log tab (Chrome/Edge developer tools, please check KBA 2280022): 

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"Access to XMLHttpRequest at 'https://<ABAP_HOTS><SESSION_ID>/bw/ina/GetResponse?sap-client=<CLIENT_ID&sap-language=EN&sap-sessionviaurl=X' from origin 'https://<SAC_HOST>' has been blocked by CORS policy: Request header field firefly-invalidate-caches is not allowed by Access-Control-Allow-Headers in preflight response."
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The error doesn't necessarily impacts the SAC story usage, however it's required more information about how to avoid this.

Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.

• SAP Analytics Cloud
• SAP NetWeaver
• SAP Business Warehouse
• SAP BW/4HANA
• SAP S/4HANA

firefly-invalidate-caches, CORS, CORS error message, BW live data connections, SAP web dispatcher, azure, SAC, live data model, Access-Control-Allow-Headers, ICM script, UCONCOCKPIT, allowed headers, exposed headers , KBA , LOD-ANA-LDC-BW , SAC Live Data Connection BW , BW4-AE-API-INA , INA (Information Access Protocoll) , BC-CST-WDP , Web Dispatcher , BW-BEX-OT-BICS-INA , BW INA provider , LOD-ANA-LDC-HAN , SAC Live Data Connection HANA , Problem