nginx proxy_next_upstream导致的一个重复提交错误

一个请求被重复提交，原因是nginx代理后面挂着2个服务器，请求超时的时候（其实已经处理了），结果nigix发现超时，有把请求转给另外台服务器又做了次处理。

配置：

proxy_next_upstream:off

后问题解决，不过也会代理另外问题，比如发布的时候部分请求会出错等。

参考：http://www.tech126.com/nginx-healthcheck/

proxy_next_upstream

默认值: proxy_next_upstream error timeout

上下文: http, server, location

Directive determines, in what cases the request will be transmitted to the next server:

error ― an error has occurred while connecting to the server, sending a request to it, or reading its response;
timeout ― occurred timeout during the connection with the server, transfer the requst or while reading response from the server;
invalid_header ― server returned a empty or incorrect answer;
http_500 ― server returned answer with code 500
http_503 ― server returned answer with code 503
http_404 ― server returned answer with code 404
off ― it forbids the request transfer to the next server

Transferring the request to the next server is only possible when nothing has been transferred to the client -- that is, if an error or timeout arises in the middle of the transfer of the request, then it is not possible to retry the current request on a different server.

来源：oschina

链接：https://my.oschina.net/u/811247/blog/109643

标签

nginx

proxy_next_upstream

nginx-healthcheck