GET： 请求指定的页面信息，并返回实体主体。

HEAD： 只请求页面的首部。

#参考:http://tengine.taobao.org/document_cn/http_upstream_check_cn.html

一、

upstream anubis.web.base_backend {    server bj-base-1.jyall.me:9000;     server bj-base-2.jyall.me:9000;     keepalive 512;    check interval=1000 rise=2 fall=2 timeout=3000 type=http;    check_http_send "HEAD / HTTP/1.1\r\nConnection: keep-alive\r\n\r\n";      check_http_expect_alive http_2xx http_3xx http_4xx;}

二、

curl -d "     server bj-base-1.jyall.me:9000;     server bj-base-2.jyall.me:9000;     keepalive 512;    check interval=1000 fall=3 rise=2 timeout=3000 default_down=false type=http;    check_http_send 'GET / HTTP/1.1\r\nConnection: keep-alive\r\nHost: open-anubis.ele.me\r\n\r\n';   #替代的配置check_keepalive_requests 100;    check_http_expect_alive http_2xx http_3xx http_4xx;" 127.0.0.1:8866/upstream/open.jyall.me.web.base_backend 返回"success"=>表示ok的

三、

curl 127.0.0.1:8866/up_status4open.jyall.me.web.base_backend

11.200.58.236:9000 up 215515 0 http 0   5 open.jyall.me.web.base_backend 11.200.62.77:9000 up 215283 0 http 0