Frontend developer course.Servers may also send this response instead of 403 Forbidden to hide the existence of a resource from an unauthorized client. This response code is probably the most well known due to its frequent occurrence on the web. The401Unauthorized HTTP status code indicates that the client’s request has not been applied because it lacks valid authentication credentials. The server requires the client to authenticate itself to access the requested resource. When to use "401Unauthorized" status code and when to use "403 Forbidden.Assume your Web API is protected and a client attempts to access it without the appropriate credentials. How do you deal with this scenario? Most likely, you know you have to return an HTTP status code. The HTTP 401Unauthorized client error response status code indicates that a request was not successful because it lacks valid authentication credentials for the requested resource. In Kommo you can get this status code in case of using invalid account data, expired... Unlike a 401Unauthorized response, authenticating will make no difference. The 404 error status code indicates that the REST API can’t map the client’s URI to a resource but may be available in the future. Image GalleryDemystifying HTTP Error Codes401 vs 403401unauthorized: why?how to fix it? The parameter to this message gives a specification of authorization schemes which are acceptable. The client should retry the request with a suitable Authorization header. but its sending me back 401 not unauthorized error.