Nginx代理Jenkins时”No valid crumb was included in the request"错误的修复

如题，Jenkins前端用Nginx做了代理。

万分恼怒的是正在配置Jenkins任务，保存时确报出个"No valid crumb was included in the request"的错误，东西都没存住，杀人的心都有了。

如何修改呢？

首先，修改jenkis的启动配置，centos下是：

JENKINS_JAVA_OPTIONS="-Djava.awt.headless=true -Dhudson.security.csrf.requestfield=crumb"  

然后，修改Nginx配置：

...
server {  
    listen                    80;
    server_name               build.xxx.com;
    ignore_invalid_headers    off;
...