What is 401 error code?

The 401 Unauthorized Error is an HTTP status code error that represented the request sent by the client to the server that lacks valid authentication credentials. It may be represented as 401 Unauthorized, Authorization required, HTTP error 401- Unauthorized. It represents that the request could not be authenticated. It consists of a www-Authenticate header which contains the hint on how to authorize correctly. 

401 Unauthorized Error Occur: This error may occur due to the reasons described below: 

• It may occur client does not provide the proper authentication credentials to the server within the request time.
• It may occur when the server rejects the request of the client for some reason even though the client provides proper authentication credentials.
• When the client is banned for some reason by the server.

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