问Nginx error -Starting nginx: nginx: emerg未知“状态”变量

EN

user              nginx;                                                        
 worker_processes  1;                                                            

 error_log  /var/log/nginx/error.log;                                            
 pid        /var/run/nginx.pid;                                                  

 events {                                                                        
    worker_connections  1024;                                                   
 }                                                                               

http {                                                                          
    include       /etc/nginx/mime.types;                                        
    default_type  application/octet-stream;                                     

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '   
                  '[===>$status] $body_bytes_sent "$http_referer" '         
                  '"$http_user_agent" "$http_x_forwarded_for"';             

     access_log  /var/log/nginx/access.log  main;                                

     sendfile        on;                                                         
     keepalive_timeout  65;                                                      

    # Load config files from the /etc/nginx/conf.d directory                    
    # The default server is in conf.d/default.conf                              
   include /etc/nginx/conf.d/default.conf;                                      
}  

server {
    listen       80 default_server;
    server_name  _;

    #charset koi8-r;

    #access_log  logs/host.access.log  main;

    location / {
        # root   /usr/share/nginx/html;
        # index  index.html index.htm;

        proxy_set_header X-Real-IP  $remote_addr;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header Host $host;
        proxy_pass http://backend_ip_Address;


        set $my_var 0;
        if ($status = "200"){
            set $my_var 1;
        }

        #if($status = 4xx) {
         #  set $my_var  2;
        #}

        if ($my_var = 1){
             proxy_pass http://www.google.com;
        }

        if ($my_var = 2) {
            proxy_pass http://www.facebook.com;
        }
    }

    error_page  404              /404.html;
    location = /404.html {
        root   /usr/share/nginx/html;
    }

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    } 
}