What is 401 Unauthorized (401 Error क्या है )

The 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.

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.

Also HTTP response status codes that are in the 4xx range are considered client error responses. These types of messages are in contrast to errors in the 5xx category, such as a 503 service unavailable error, which we investigated last week, which is considered a server error response. That said, the presence of a 4xx error does not necessarily mean that the problem has something to do with the client, where the client is the web browser or device that is being used to access the application. Often, if you are trying to diagnose a problem with your own application, you can immediately identify most client-side code and components, such as HTML, cascading style sheets (CSS), client-side JavaScript and so forth. Can be ignored. This does not apply solely to web sites, either, because many smart phone apps that have a modern-looking user interface are actually powered by a common web application behind the curtain; One that is hidden from the user only.

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 Errors to restrict access requests from specific IP addresses, so if authentication is not the issue, a server-side ban could be the problem.


What is 500 error (500 error क्या है)

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