Hello World API CloudFormation - Python Lambda with CORS enabled

Hello_World_API-Lambda_CORS.yml

  Lambda:
    Type: AWS::Lambda::Function
    Properties:
      Code:
        ZipFile: |
        def handler(event, context):
          response = {
            'isBase64Encoded': False,
            'statusCode': 200,
            'body': 'HELLO WORLD!',
            'headers': {
                'access-control-allow-methods': 'GET',
                'access-control-allow-origin': '*',
                'access-control-allow-headers': 'Content-Type, Access-Control-Allow-Headers'
            }
          }
          return response
      Handler: lambda_function.handler
      Role: !GetAtt LambdaRole.Arn
      Runtime: python3.7