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Getting below error even though appropriate headers are set

 

Access to fetch at '<workfront url>/attask/api/v12.0/upload' from origin 'https://localhost:9080' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

 

headers being set:

headers: {
        'apiKey': '<key>',
        'Content-Type': 'multipart/form-data',
        'Access-Control-Allow-Origin': '*'
      }