What is 401 Unauthorized (401 Error क्या है )
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.
This status is sent with a
WWW-Authenticate header that contains information on how to authorize correctly.
This status is similar to
403, but in this case, authentication is possible.
On the other hand, it does not tell the client as to the actual cause of the 401 unauthorized error. In many cases the customer may send a request that does not contain any authentication information, which often leads to an unexpected 401 unauthorized error. We will explore some of these scenarios (and possible solutions) below, but be aware that, even though a 401 unauthorized error is considered to be a client error response, it does not mean that we are also asking the client or the server Can be denied. As the culprit in this scenario. In these scenarios, the server is still the network object producing a 401 unauthorized error, and returning it to the client as an HTTP response code, but it may be that the client is causing the problem in some way
Diagnosing a 401 Unauthorized Error
As discussed in the introduction, a
401 Unauthorized Error indicates that the
client (the web browser, in most cases) has requested a restricted resource (such as a web page) from the
server, but the client has failed to provide valid authentication credentials. This might occur in one of a handful of possible scenarios:
- The client sent its authentication credentials to the server, but the server has rejected the credentials for some reason.
- The client failed to provide any authentication credentials within the request.
- The client is banned for some reason. Some applications use
401 Unauthorized Errorsto restrict access requests from specific IP addresses, so if authentication is not the issue, a server-side ban could be the problem.