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HTTP 401 Unauthorized — Authentication Required

Critical4xx client error

Overview

HTTP 401 Unauthorized means authentication is required. The client must provide valid credentials.

Key Details

  • Status: 401 Unauthorized
  • Category: 4xx Client Error
  • Authentication required or failed
  • Response includes WWW-Authenticate header

Common Causes

  • No authentication credentials provided
  • Access token expired
  • Invalid username or password
  • Bearer token is missing or malformed

Steps

  1. 1Check if Authorization header is included
  2. 2Verify the token has not expired
  3. 3Refresh the access token if using OAuth
  4. 4Confirm credentials are correct

Tags

http-status4xx-client-errorhttp-401httpstatus-code

More in 4xx Client Error

http-400-bad-requestHTTP 400 Bad Request — What It Means & How to Fix It
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http-401-unauthorizedHTTP 401 Unauthorized — What It Means & How to Fix It
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http-402-payment-requiredHTTP 402 Payment Required — What It Means & How to Fix It
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http-403-forbiddenHTTP 403 Forbidden — What It Means & How to Fix It
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http-404-not-foundHTTP 404 Not Found — What It Means & How to Fix It
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http-405-method-not-allowedHTTP 405 Method Not Allowed — What It Means & How to Fix It
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Frequently Asked Questions

401 means not authenticated (who are you?). 403 means not authorized (you cannot access this).