Jul 4, 2025 · The HTTP 401 Unauthorized client error response status code indicates that a request was not successful because it lacks valid authentication credentials for the requested resource.

Jul 21, 2010 · Receiving a 401 response is the server telling you, “you aren’t authenticated–either not authenticated at all or authenticated incorrectly–but please reauthenticate and try again.” To help you …

Jul 12, 2025 · The "401 Unauthorized Error" is a standard HTTP response status code that indicates that a request sent to a server cannot be completed because it lacks valid authentication credentials.

Nov 11, 2024 · Not sure what a 401 error is? Learn what 401 Unauthorized errors are, their causes, and the steps you can take to resolve and prevent them.

Apr 7, 2025 · If you are browsing the web regularly, encountering errors such as “401 Unauthorized Error” is a familiar occurrence. This HTTP status code indicates that the user’s request for the …

Dec 3, 2025 · Let’s get an overview of the 401 error code its common causes, and basic tips on how to fix it. What is the 401 Error code? HTTP error 401 means a user doesn’t have permission to access …

Dec 20, 2024 · What is HTTP 401 Error? The HTTP 401 Unauthorized error is a status code 401 returned by the server when authentication fails. It means the server has received your request, but it …

Sep 30, 2025 · According to the Internet Engineering Task Force (IETF), when a server returns a 401 status code, it’s essentially saying: “I received your request, but I can’t verify who you are.” Unlike …

Dec 23, 2025 · HTTP 401, often referred to as “Unauthorized Error”, is an HTTP status code indicating that the client's request lacks valid authentication credentials. In simpler terms, it means the server …

Aug 2, 2023 · The 401 Unauthorized status code indicates that authorization is required to access the requested resource. The server will inform which Authentication method (s) it supports and the client …