5xx · Server Error
522Connection Timed Out
Cloudflare：与源站连接超时。
What is HTTP 522?
522 Connection Timed Out 表示 Cloudflare 与源站建立 TCP 连接超时。可能是源站过载、网络拥堵或源站防火墙丢弃了 SYN 包。
Example
TCP handshake timeout to origin → Cloudflare 522Check a URL in real-time
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