Preventing Request Loops Using CDN-Loop

What this post added

This post introduces the CDN-Loop header, a new IETF draft standard developed in collaboration with other CDN providers (Fastly, Akamai) to address request loop protection. It details the problem of request loops, the shortcomings of previous solutions like the Via header (performance degradation due to legacy usage and gzip issues), and the ad-hoc methods used previously (CF-Connecting-IP, X-Forwarded-For). The post explains the syntax and usage of the CDN-Loop header and Cloudflare's implementation of it at the edge, replacing previous methods and allowing for more granular control over loop detection and prevention.