Load balancing configuration

proxy_connect_timeout 30s;
proxy_send_timeout 90;
proxy_read_timeout 90;
proxy_buffer_size 32k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_redirect off;
proxy_hide_header Vary;
proxy_set_header Host $host;
proxy_set_header Referer $http_referer;
proxy_set_header Cookie $http_cookie ;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_ignore_client_abort on;

The above introduces the load balancing configuration, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.