401

Unauthorized

Client Error

RFC 7235

Popular

The request requires user authentication.

Detailed Information

The 401 status code indicates that the request requires user authentication. The response must include a WWW-Authenticate header field containing a challenge applicable to the requested resource.

Common Examples

Accessing protected resources
API requests requiring authentication

Common Uses

API requests requiring authentication
Protected resources

Best Practices

Use when authentication is required
Include WWW-Authenticate header with authentication details
Ensure proper authentication mechanisms are in place

Quick Actions

Category Information

Client Error

The request contains bad syntax or cannot be fulfilled

Related Status Codes

3 similar

400

Bad Request

The server cannot or will not process the request due to something that is perceived to be a client error.

402

Payment Required

Reserved for future use.

403

Forbidden

The server understood the request, but is refusing to fulfill it.

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