特定的接口进行反向代理，出现了get请求参数丢失的情况，处理如下：
location /mxx/login {
proxy_pass $scheme://172.16.1.196:80/a/b/c/cloudLogin?$args;
proxy_set_header Host gw-dev.msunhis.com;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Upgrade $http_upgrade;
client_max_body_size 8M;
}location /mxx/login {
proxy_pass $scheme://172.16.1.196:80/a/b/c/cloudLogin?$args;
proxy_set_header Host gw-dev.msunhis.com;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Upgrade $http_upgrade;
client_max_body_size 8M;
}