Haproxy 配置 ACL 处理不同的 URL 请求

1. 需求说明
   服务器介绍：
   HAProxy Server: 192.168.1.90
   WEB1 : 192.168.1.103
   WEB2 : 192.168.1.105
   Domain: tecadmin.net
   当用户访问：tecadmin.net/blog链接，只会跳转到WEB2(192.168.1.105)服务器.
   而其他所有的访问将根据权值跳转到WEB1或者WEB2服务器
2. 配置文件
   

   global
       log 127.0.0.1 local0 notice
       maxconn 50000
       daemon
   defaults
       log global
       mode http
       option httplog
       option dontlognull
       contimeout 120000
       clitimeout 120000
       srvtimeout 120000
       option forwardfor
       option http-server-close
   
   # Configuration for HTTP site
   frontend http-in
       bind 192.168.1.90:80
       acl is_blog url_beg  /blog
       use_backend tecadmin_blog if is_blog
       default_backend tecadmin_website
   
   backend tecadmin_blog
       mode http
       balance roundrobin  # Load Balancing algorithm
       option httpchk
       option forwardfor
       server WEB2 192.168.1.105:80 weight 1 maxconn 512 check
   
   backend tecadmin_website
       mode http
       balance roundrobin  # Load Balancing algorithm
       option httpchk
       option forwardfor
       server WEB1 192.168.1.103:80 weight 1 maxconn 512 check
       server WEB2 192.168.1.105:80 weight 1 maxconn 512 check

3. 参考链接：http://tecadmin.net/haproxy-acl-for-load-balancing-on-url-request/