401 status code: Learn the difference between 401 and

Learn the difference between 401 and 403 status codes, and when to use them for authentication and authorization errors. See answers from experts and users, with examples and references to RFCs. 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. What is the 401 HTTP Status Code? The 401 Unauthorized is an HTTP status code that indicates the request to the web server requires user authentication. The full name is “401 Unauthorized” or “HTTP 401,” as defined in the HTTP specification RFC 7235. The 401 code is in the class of 400 codes that signify a client-side error, meaning the requesting client did not provide a valid request. To Fix the 401 Unauthorized Access Error, it’s crucial to understand the root causes and ... What is '401 Unauthorized'? Learn how to use and/or fix this HTTP status code, with free examples and code snippets.