工作中apache 的两个不同配置

<VirtualHost *:8802>
    ServerName wflow.xx.com
    DocumentRoot "/interf/bin/apache2064/xxdoc"
    
   RewriteEngine On
  


    ErrorLog  logs/wowxCard-error_log
    CustomLog logs/wowxCard-access_log common
    
ProxyRequests         Off
ProxyPreserveHost     On


ProxyPass           /crm2wxServlet     www.xx.com
ProxyPassReverse    /crm2wxServlet     www.xx.com


ProxyPass           /testwxServlet     http://123.41.223.16:3344
    ProxyPassReverse    /testwxServlet    ttp://185.61.131.16:3344

</VirtualHost>

通过这种方式进行转发会把报文头的发起地址改了

后改成

<VirtualHost *:8802>
    ServerName wflow.xx.com
    DocumentRoot "/interf/bin/apache2064/xxxdoc"
    
   RewriteEngine On
  


    ErrorLog  logs/wowxCard-error_log
    CustomLog logs/wowxCard-access_log common
    
ProxyRequests         On
ProxyPreserveHost     On


<Proxy http://xx.com>
        Order deny,allow
        Deny from all
        Allow from 130.xx.111.44
</Proxy>

<Proxy http://193.121.32.26:20128>
        Order deny,allow
        Deny from all
        Allow from 130.59.1.110
</Proxy>


</VirtualHost>

这种方式代理，不改变报文头，这是为啥呢