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[javascript] XMLHttpRequest cannot load XXX No 'Access-Control-Allow-Origin' header

This CORS issue wasn't further elaborated (for other causes).

I'm having this issue currently under different reason. My front end is returning 'Access-Control-Allow-Origin' header error as well.

Just that I've pointed the wrong URL so this header wasn't reflected properly (in which i kept presume it did). localhost (front end) -> call to non secured http (supposed to be https), make sure the API end point from front end is pointing to the correct protocol.

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