apache 和 nginx 的实现原理一样，都是做一个反向代理，把请求向后端传递，配置如下所示：
NameVirtualHost *:80
<VirtualHost *:80>
ServerAdmin webmaster@dummy-host.example.com
ServerName www.a.com
ProxyRequests Off
<Proxy *>
Order deny,allow
Allow from all
</Proxy>
ProxyPass / http://127.0.0.1:8080/
ProxyPassReverse / http://127.0.0.1:8080/
</VirtualHost>
<VirtualHost *:80>
ServerAdmin webmaster@dummy-host.example.com
ServerName www.b.com
ProxyRequests Off
<Proxy *>
Order deny,allow
Allow from all
</Proxy>
ProxyPass / http://127.0.0.1:8081/
ProxyPassReverse / http://127.0.0.1:8081/
</VirtualHost>
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