| Click HTTP Response Headers |
At the Default Web Site level, in the center panel double click the HTTP Response Headers button: 
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| Click Add |
In the top right, click Add:
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| Add Access-Control-Allow-Headers |
In Name, enter: Access-Control-Allow-Headers In Value, enter: Range,Cache-Control  Click OK to confirm. |
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| Add Access-Control-Allow-Origin |
For on prem solutions, if you have a virtual proxy folder, repeat the above steps but this time: At the Default Web Site level, select the Proxies virtual folder in the left-hand menu. In the center panel, double-click the HTTP Response Headers button and in the top right, click Add. In Name, enter: Access-Control-Allow-Origin In Value, enter the server name hosting the IIS. Alternatively, "*" can be used for all hosts but poses security risks: http://IIS_HOST Click OK to confirm. For the Proxies virtual folder the two values should now appear as in the screenshot below.
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Add HTTP Response Headers for 3.3
Updated on December 9th, 2022
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