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Everything You Need to Know HTTP 401 Unauthorized

Introduction

What Is HTTP 401 Unauthorized?

Definition and Meaning

When and Why This Error Occurs

Common Causes of HTTP 401 Errors

Incorrect Login Credentials

Expired Authentication Tokens

Misconfigured API Keys

IP-Based Restrictions

Incomplete Authentication Process

Omitting required headers or session cookies during authentication can result in this error.

How to Fix HTTP 401 Errors

For Users:

For Developers and Admins:

Examples of HTTP 401 Responses

Sample Server Response:

Common Scenarios:

Frequently Asked Questions

What is the difference between HTTP 401 and 403?

How does HTTP 401 affect SEO?

How do I debug HTTP 401 errors?

Are 401 errors the same as 400 errors?

Can cookies cause 401 errors?

Key Takeaways

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