HTTP Status Codes - Online Reference Guide

Reference guide for HTTP status codes. Learn the meaning of 200, 404, 500, and all HTTP codes.

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401client

Unauthorized

Authentication is required and has failed or has not been provided. The client must authenticate to get the requested response.

Common Causes

Missing or invalid authentication credentials, expired tokens, or wrong credentials.

How to Fix

Provide valid authentication credentials. Check API keys, tokens, or login credentials. Ensure the Authorization header is correct.

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