nginx proxy apache

#
     server {
     listen          80;
     server_name     demo.com;
     index            index.php index.html;
     root            /opt/b2c/web/com/
     access_log      /opt/b2c/logs/nginx/
     error_log       /opt/b2c/logs/nginx/
     location ~* .(jpg|gif|png|js|css)$ {
            if (-f $request_filename) {
                expires 24h;
                break;
            }
        }
     location /status {
        stub_status on;
                   }
location / {
     try_files $uri $uri/ /index.php?q=$uri&$args;
                }
          location ~ \.php$  {
           proxy_redirect off;
           proxy_set_header Host  $host;
           proxy_set_header X-Forwarded-For  $remote_addr;
           proxy_set_header X-Real-IP $remote_addr;
           proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          # proxy_hide_header Content-Type;
           proxy_buffer_size 500k;
           proxy_buffers     5  500k;
           proxy_pass ;

                          }
                }