解决nginx提示无法同时使用正则表达式和proxy_pass的问题

一开始想匹配所有level开头的http流量到12000端口，结果报错。说regular expression 和 proxy_pass 无法同时使用。

“proxy_pass” cannot have URI part in location given by regular expression, or inside named location, or inside “if” statement, or inside “limit_except” block in /etc/nginx/conf.d/default.conf:35

在这里插入代码片

location ~/level.+{
               proxy_pass http://127.0.0.1:12000/ #注意这个反斜杠
               ;proxy_set_header Host $host;
               proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
       }

去掉一个反斜杠后就好了，原因国外的大神说的很清楚：
https://serverfault.com/a/649196/677

location ~/level.+{
               proxy_pass http://127.0.0.1:12000 #去掉了
               ;proxy_set_header Host $host;
               proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
       }