Pro2.0 反向代理问题吗？客服连接失败

#PROXY-START/
location  ~* \.(php|jsp|cgi|asp|aspx)$
{
    proxy_pass http://127.0.0.1:20199;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header REMOTE-HOST $remote_addr;
}
location /
{
    if (!-e $request_filename) {
         proxy_pass http://127.0.0.1:20199;
    }
    proxy_http_version 1.1;
    proxy_read_timeout 360s;   
    proxy_redirect off; 
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header REMOTE-HOST $remote_addr;
  
    add_header X-Cache $upstream_cache_status;
  
    #Set Nginx Cache
  
       add_header Cache-Control no-cache;
    expires 12h;
}
#PROXY-END/