From b23fa9500926e8f82f173dbd5b5de3ceffc8558e Mon Sep 17 00:00:00 2001 From: Nic <123965403+ngayerie@users.noreply.github.com> Date: Mon, 14 Apr 2025 18:38:52 +0200 Subject: [PATCH] [Support] Update troubleshooting-cloudflare-5xx-errors.mdx --- .../troubleshooting-cloudflare-5xx-errors.mdx | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/src/content/docs/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors.mdx b/src/content/docs/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors.mdx index 210356d0809d5e..d35ce478ab8322 100644 --- a/src/content/docs/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors.mdx +++ b/src/content/docs/support/troubleshooting/cloudflare-errors/troubleshooting-cloudflare-5xx-errors.mdx @@ -118,12 +118,13 @@ 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. +- Error is only visible in the logs or analytics -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). +Additionally, `503` status codes in logs or analytics may result from . ### Resolution @@ -141,6 +142,13 @@ 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.