4xx client error

How to fix it

Check the exact status in the alert detail and fix the underlying cause (auth, validation, missing resource).

Sibling checks in this category

• 404 Not Found - The page returns 404. Search engines drop it from the index and inbound links waste their authority.
• 403 Forbidden - The server refused the request. Crawlers and users alike see a wall instead of content.
• 409 Conflict - The server reports the request conflicts with current state. Often a deployment or data race issue.
• 500 Internal Server Error - The server crashed handling this URL. Repeated 500s deindex the page over time.

Catch it on your site

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