How do you serve a 429 response with CloudFlare (or other custom response code)?

[sandro]

@sarke

Cloudflare takes this personally and responds with HTTP 521 to the browser.

Don’t know why you think so, but I am afraid that is not accurate.

A 521 has other reasons.

Community Tip - Fixing Error 521: Web server is down

Error Try the suggestions in this Community Tip to help you fix Error 521: Web server is down. Background A 521 error happens when we are unable to make a TCP connection to your origin server. Specifically, Cloudflare tried to connect to your origin server on port 80 or 443, but received a connection refused error. This is often caused by security or firewall software and happens if the origin server has directly refused Cloudflare’s proxy request. [Banner in tip catalog] Quick Fix Ideas …