/Javascript/React/Has been blocked by cors policy react fetch firebase realtime database

Has been blocked by cors policy react fetch firebase realtime database

likely error that arise to  cors blocked when using firebase is
when you initiate a put or get request with an incomplete firebase url
e.g
// wrong form
 this.http.get('https://******.firebaseio.com/data')   //this will throw an exception

// correct form                                                    
  this.http.get('https://******.firebaseio.com/data.json')

Source: stackoverflow.com

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