What is a 401 error code?

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In contrast, a 403 status code requires a different approach because the user has already provided correct credentials. You can resolve the issue by reviewing and adjusting the user's permissions or by addressing server-side restrictions that are blocking access to the resource.

complexity
The HTTP 401 [Unauthorized] error is less complex as it revolves around the failure to satisfy [authentication protocols] such as basic or bearer token [authentication] .

Alternatively, the 403 "Forbidden" error is more technically complex. It requires the evaluation of access control lists, role-based access control, or discretionary access control.

Here, the server enforces "policy-based" restrictions and denies access due to fantuan database insufficient permissions, even if the correct authentication headers are provided.


401 error code

The tatus code 401 means that the client request is not authenticated. The server cannot verify the client's identity due to a lack of valid credentials.

401 error is triggered for the following reasons:

No credentials provided : When a user attempts to access a file but lacks authentication credentials. Sometimes users fail to provide a properly signed token, resulting in access being denied.
Invalid credentials : Login issues can also occur due to server misconfiguration or incorrect database connections. In this case, the user enters credentials, but they are incorrect, or the TLS certification is not configured correctly.
Expired credentials : In many cases, cached credentials expire, requiring reauthentication. Some misconfigurations could also lead to endless loops where the login page keeps loading.