日志里面有如下报错：

[error] 1844#0: *23 upstream sent too big header while reading response header from upstream, client: 222.137.202.219, server: jd.artuion.com, request: "GET /mobile/admin/menu.php?act=list HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "jd.artuion.com", r

在 nginx.conf 的http段，加入下面的配置：

proxy_buffer_size  128k;
proxy_buffers   32 32k;
proxy_busy_buffers_size 128k;

重启后一般就可以解决， 如果还是报502，再在host配置的php段加入下面配置：

fastcgi_buffer_size 128k;
fastcgi_buffers 4 256k;
fastcgi_busy_buffers_size 256k;

重启nginx即可。