for myself

Listen 202.x.xx.xxx:80        (别人访问的IP和端口)
<VirtualHost 202.x.xx.xxx:80>

  ServerAdmin [e-mail]
     ProxyRequests Off
     Proxypass / balancer://proxy/
     ProxySet lbmethod=bytraffic   （加上这句）
     <Proxy balancer://proxy>
         Order Deny,Allow
         Allow from all
         BalancerMember http://10.0.0.1  
         BalancerMember http://10.0.0.2   status=+H
     </Proxy>

</VirtualHost>