TODO: add more description on why this service is very useful
haproxy里backend里加：
option httpchk GET /status?SERVICE=trafficserver HTTP/1.1\r\nHost:\ cdn.hc.org
http-check disable-on-404
ATS remap里加：
map http://cdn.hc.org:8080/ http://127.0.0.1:8001/
map http://cdn.hc.org:80/ http://127.0.0.1:8001/
haproxy里backend里加：
option httpchk GET /status?SERVICE=squid HTTP/1.1\r\nHost:\ cdn.hc.org
http-check disable-on-404
Squid的peer中添加：
##squid 7 layer
cache_peer 127.0.0.1 parent 8001 0 originserver proxy-only
cache_peer_domain 127.0.0.1 cdn.hc.org
KeepAlived real_server add:
inhibit_on_failure
HTTP_GET {
url {
path /status?SERVICE=haproxy&VIP=1.2.3.4,1.2.3.5
status_code 200
}
connect_timeout 3
nb_get_retry 2
delay_before_retry 5
}
HAProxy加backend：
# http_status backend, to localhost
backend http_status
server hc 127.0.0.1:8001 maxconn 100
HAProxy的frontend加：
acl hc hdr_beg(host) -i hc.tbcdn.cn
use_backend http_status if hc
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