502

Bad Gateway

服务器作为网关或代理，从上游服务器接收到了无效的响应。这通常意味着后端服务暂时过载或正在维护。

LIVE

➜ ~ curl -I https://api.example.com/v1/data

Trying 192.168.1.100:443...

Connected to api.example.com (192.168.1.100) port 443 (#0)

TLSv1.3 (OUT), TLS handshake, Client hello (1):

TLSv1.3 (IN), TLS handshake, Server hello (2):

Warning: Upstream server timed out (504)

HTTP/2 502

date: Tue, 22 Sep 2026 10:23:45 GMT

content-type: text/html

server: cloudflare

Connection #0 to host api.example.com left intact

CDN 状态

正常运行

后端 API

连接失败