error occurred when checking operation from API Explorer

Document ID : KB000120395
Last Modified Date : 08/11/2018
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Called api from API Explorer. 
But the following error is shown. 
[SCRIPT7002: XMLHttpRequest: Network Error 0x80070005, Access is denied.] 
This problem only occurs in API Explorer. 
If api is called with curl, the problem does not occur.
API Potral 4.2
This behavior is expected. For security reason, the portal api explorer doesn't allow the cross-origin request, 
and the Cross-Origin Resource Sharing (CORS) is disabled for api-explorer. 

Workaround: open another tab, paste the Token Endpoint on the bottom left of the page.
Once it's been executed in the new tab, come back to the previous tab and re-submit the request(and it should be working fine now).