upstream sent too big header while reading response header from upstream

网站一些链接点击后出现502错误，查看nginx error日志，里面有一句：

upstream sent too big header while reading response header from upstream

太大的头？drupal返回太大的头给nginx了，于是在nginx里添加以下配置。

nginx.conf

server {
...
    fastcgi_buffers  16 16k;
    fastcgi_buffer_size  32k;
}

重启nginx服务后恢复正常。