hdr(host), hdr_beg(host) , path_beg

ACL derivatives :
    hdr([<name>[,<occ>]])     : exact string match 字符串精确匹配
    hdr_beg([<name>[,<occ>]]) : prefix match
    hdr_dir([<name>[,<occ>]]) : subdir match
    hdr_dom([<name>[,<occ>]]) : domain match
    hdr_end([<name>[,<occ>]]) : suffix match
    hdr_len([<name>[,<occ>]]) : length match
    hdr_reg([<name>[,<occ>]]) : regex match
    hdr_sub([<name>[,<occ>]]) : substring match

	192.168.32.152  haproxy  env-zjtest8
	192.168.32.154  frontend  env-zjtest8

	frontend web_service
	bind	*:80

      acl             hmq_6_req               hdr(host)           -i                      www.zjtest8.com
      use_backend     webserver_80              if                                       hmq_6_req    

        acl             hmq_7_req                path_beg            -i                   /api
      use_backend     web_api                   if                                        hmq_7_req  

      backend webserver_80
        mode            http
        balance         roundrobin
        server          webhost01_80          192.168.32.154:8001     check inter 2000 fall 3

      backend web_api
      balance         roundrobin
      server          webhost01_80          192.168.32.101:3000     check inter 2000 fall 3 

	v-dev-redis01:/var/named# curl www.zjtest8.com  跳转到192.168.32.154:8001 

	hy test

	这个时候访问；http://www.zjtest8.com/api/ipsearch?ip=202.101.172.35 也会跳到nginx服务器

192.168.32.152 - - [11/Sep/2016:16:34:02 +0800] "GET /api/ipsearch?ip=202.101.172.35 HTTP/1.1" 404 168 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:48.0) Gecko/20100101 Firefox/48.0"

haproxy 修改为：
 acl             hmq_6_req               hdr_beg(host)           -i                      www.zjtest8.com

 访问 http://www.zjtest8.com/api/ipsearch?ip=202.101.172.35 还是会跳到nginx服务器

 加上:
   acl             hmq_6_req               hdr_beg(host)           -i                      www.zjtest8.com
      acl             url_static_zl          path_end                .html .gif .png .jpg .css .js
      use_backend     webserver_80             if                                    hmq_6_req   url_static_zl

此时可以请求到/api