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[Support] Add Speed Brain 503s and Early Hints 504s to 5XX Errors page #17856

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Oct 29, 2024
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[Support] Add Speed Brain 503s and Early Hints 504s to 5XX Errors page #17856

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4 changes: 4 additions & 0 deletions ...ort/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors.mdx
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Expand Up @@ -72,6 +72,8 @@ There are two possible causes:
- (Most common cause) [502/504 from your origin web server](#502504-from-your-origin-web-server)
- [502/504 from Cloudflare](#502504-from-cloudflare)

You may also see 504 status codes in logs or analytics caused by [cache MISS responses from Early Hints](/cache/advanced-configuration/early-hints/#emit-early-hints).

### 502/504 from your origin web server

Cloudflare returns a Cloudflare-branded HTTP 502 or 504 error when your origin web server responds with a standard HTTP 502 bad gateway or 504 gateway timeout error:
Expand Down Expand Up @@ -129,6 +131,8 @@ HTTP error 503 occurs when your origin web server is overloaded. There are two p
2. The time and timezone of the 503 error occurrence
3. The output of `www.example.com/cdn-cgi/trace` from the browser where the 503 error was observed (replace `www.example.com` with your actual domain and hostname)

You may also see 503 status codes in logs or analytics caused by [unsuccessful prefetches from Speed Brain](/speed/optimization/content/speed-brain/#how-speed-brain-works).

---

## Error 520: web server returns an unknown error
Expand Down
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