524 A Timeout Occurred

What HTTP 524 A Timeout Occurred Means

Cloudflare connected to the origin but did not receive a timely HTTP response.

A Cloudflare-specific code: the TCP connection succeeded, but the origin took longer than 100 seconds to respond.

Common Causes

• Long-running request or slow database query at the origin
• Origin processing exceeds the 100s limit
• Blocked or stuck application worker
• Missing async handling for slow tasks

How to Fix It (For Visitors)

• Refresh and try again
• Contact the website owner if it keeps happening

How to Fix It (For Developers/Admins)

• Optimize slow endpoints and queries
• Move long tasks to background jobs and return quickly
• Use Cloudflare Enterprise to raise the timeout, or a subdomain bypassing the proxy for long requests
• Add caching

Returning a 524 A Timeout Occurred (Code Examples)

If you build APIs or web apps, here is how to send an HTTP 524 response and how to test for it:

Node.js (Express)

app.get('/resource', (req, res) => {
  res.status(524).json({ error: 'A Timeout Occurred' });
});

Python (Flask)

@app.route('/resource')
def resource():
    return jsonify(error='A Timeout Occurred'), 524

PHP

<?php
http_response_code(524);
header('Content-Type: application/json');
echo json_encode(['error' => 'A Timeout Occurred']);

Check the status with curl

curl -I https://example.com/resource
# Look for: HTTP/1.1 524 A Timeout Occurred

Frequently Asked Questions

What does HTTP 524 A Timeout Occurred mean?

A Cloudflare-specific code: the TCP connection succeeded, but the origin took longer than 100 seconds to respond. In short: Cloudflare connected to the origin but did not receive a timely HTTP response.

Is a 524 A Timeout Occurred error my fault or the website's?

524 is a 5xx server-error code, so the problem is on the server side, not your browser or device. As a visitor you can usually only retry; if you run the site, investigate the server.

How do I fix a 524 A Timeout Occurred error?

Optimize slow endpoints and queries. Move long tasks to background jobs and return quickly. Use Cloudflare Enterprise to raise the timeout, or a subdomain bypassing the proxy for long requests.

Official Specification

The 524 A Timeout Occurred status code is defined in Cloudflare (non-standard).

View the IANA HTTP Status Code Registry →