401 (Unauthorized) code example

Example 1: 401 vs 403

401 Unauthorized  VS 403 Forbidden

    401 Unauthorized meaning 
    	you did not provide a credential or correct credentials to send the 
        request 
    	you are encorouranged to try again with correct credentials

    403 Forbidden 
    	even you did provide valid credentials
    		you are not authorized to take this action by who you are 
    		because you do not have authority or permission 
    	Do not bother to try again !

Example 2: HttpErrorResponse {headers: HttpHeaders, status: 401, statusText: "Unauthorized"

//if you are getting this error and are using Firebase it could be that you 
 //need to set the rules of your Realtime database to true to allow your 
 //app access to your database:
 
 "rules": {
     ".read" : true ,
    ".write": true
     }

Example 3: unauthorized status code

HTTP 401 : Unauthorized client error status response code indicates that the request has not been applied because it lacks valid authentication credentials for the target resource

Example 4: http 401 unauthorized

401 Unauthorized