公司的电子商务网站，前端使用Nginx作反向代理，后端服务器使用的是LAMP架构，网站可以正常访问但在后台管理中无法上传文件和图片，注册用户提交数据时报错：502 Bad Gateway Nginx，而在后台上传图片时Nginx错误日志则有如下报错：
upstream prematurely closed connection while reading response header from upstream, client: 19.13.226.1, server: www.nt.cn, request: "POST /index.php?controller=pic&action=upload_json&dir=image HTTP/1.1", upstream: " http://192.168.1.10:80/index.php?controller=pic&action=upload_json&dir=image ", host: "www.nt.cn", referrer: " http://www.nt.cn/index.php?controller=seller&action=goods_edit&id=506 "
解决：
upstream prematurely closed connection while reading response header from upstream, client: 19.13.226.1, server: www.nt.cn, request: "POST /index.php?controller=pic&action=upload_json&dir=image HTTP/1.1", upstream: " http://192.168.1.10:80/index.php?controller=pic&action=upload_json&dir=image ", host: "www.nt.cn", referrer: " http://www.nt.cn/index.php?controller=seller&action=goods_edit&id=506 "
解决：
1) 在DNS解析记录中增加CNAME解析，可以解决问题，这也是我目前解决的办法，只是需要一个动态域名；
本文转自 zengwj1949 51CTO博客，原文链接:http://blog.51cto.com/zengwj1949/2044005
