高级

upstream

cookie的会话保持

upstream httpget {
	hash $cookie_jessionid // 根据浏览器cookie例的jessionid定向负载均衡

    server 192.168.1.1;
    server 192.168.1.2;
}

keepalive

http {
    keepalive_timeout 0; // 浏览器的connenct会变为close
}