Cloudflare 520–526 Errors Explained: Causes and Fixes
What Cloudflare's 520, 521, 522, 523, 524, 525, and 526 errors mean, why they happen between Cloudflare and origin, and how to diagnose and fix each one.
5xx Server Errors: 500, 502, 503, 504 Explained
Understand 500, 502, 503 and 504 server errors, diagnose application, proxy and upstream causes, and monitor status, body and error-rate patterns.
Cloudflare Workers Monitoring: D1, R2, KV & Edge Errors
Monitor Cloudflare Workers, D1, R2, and KV with current limits, native telemetry, consistency checks, and outside-in edge probes.
DDoS Monitoring: Detect Attacks, Protect the Origin, and Verify Recovery
Detect DDoS traffic, distinguish attacks from legitimate spikes, monitor edge and origin pressure, and verify mitigation without false alerts in production.
Cloudflare Monitoring: How to Detect Origin Outages Behind a CDN
Monitor Cloudflare edge delivery and protected origin-dependent paths separately so cache hits do not hide API, TLS, WAF, or backend failures.