修复Nginx报错：upstream sent too big header while reading response header from upstream

今天打开wordpress后台时发现一直502，日志里面有如下报错：

[error] 51982#0: *1 upstream sent too big header while reading response header from upstream, client: 127.0.0.1, server: work.cc, request: “POST /api/user/register HTTP/1.1”, upstream: “fastcgi://127.0.0.1:9000”, host: “blog.mallol.cn/“,

google一番，解决方法如下：

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。

参考：
http://henter.me/post/nginx-error-upstream-sent-too-big-header-while-reading-response-header-from-upstream.html
http://hi.baidu.com/wastorode/item/ec86ade6ac0af7a2c10d75f4