diff --git a/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors.mdx b/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors.mdx index 52b0aa3b9cd172..790ca1e4229025 100644 --- a/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors.mdx +++ b/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-5xx-errors.mdx @@ -118,12 +118,11 @@ HTTP error 503 occurs when your origin web server is overloaded. ### Common causes -There are two possible causes identifiable by the error message: +There are different causes identifiable by the error message or the location of the error: - Error does not contain `cloudflare` or `cloudflare-nginx` in the HTML response body. In this case, the issue is likely from your origin server. - Error contains `cloudflare` or `cloudflare-nginx` in the HTML response body. In this case, the issue may stem from Cloudflare. - -Additionally, `503` status codes in logs or analytics may result from [unsuccessful prefetches from Speed Brain](/speed/optimization/content/speed-brain/#how-speed-brain-works). +- Error is only visible in logs or analytics. ### Resolution @@ -141,6 +140,10 @@ If the error contains `cloudflare` or `cloudflare-nginx` in the HTML response bo - The time and timezone of the `503` error occurrence - 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) +#### 503 Error only visible in logs and analytics + +These errors result from [unsuccessful prefetches from Speed Brain](/speed/optimization/content/speed-brain/#how-speed-brain-works) and can be discarded. These errors are not visible to visitors of your website. [Speed Brain](/speed/optimization/content/speed-brain/#enable-and-disable-speed-brain) can be disabled for the zone if needed (this feature cannot be disabled for a specific path). + ## Error 520: web server returns an unknown error This error occurs when the origin server returns an empty, unknown, or unexpected response to Cloudflare.