HTTP 508 Loop Detected

What does HTTP 508 mean?

The server detected an infinite loop while processing the request. Shared hosts (cPanel / CloudLinux) also use 508 when an account exceeds its resource limits (entry processes).

5xx Server error: The request looked valid, but the server failed to fulfil it. The fix is on the server side.

Common causes of a 508 error

• Hosting account resource limits reached.

How to fix 508 Loop Detected

• Upgrade the hosting plan or reduce concurrent processes; add caching.

508 and SEO

Persistent errors reduce crawling.

Example response

HTTP/1.1 508 Loop Detected

How to return a 508 response

Node.js (Express)

res.status(508).json({ error: 'Loop Detected' });

PHP

http_response_code(508);

Python (Flask)

return {'error': 'Loop Detected'}, 508

Go (net/http)

w.WriteHeader(508)

nginx

return 508;

Related status codes

• 503 Service Unavailable — The server is temporarily unable to handle the request.
• 500 Internal Server Error — The server hit an unexpected condition and could not complete the request.

Check which status code a URL returns with the HTTP header checker.