LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_connect_module modules/mod_proxy_connect.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule proxy_ftp_module modules/mod_proxy_ftp.so

Include conf/extra/httpd-vhost.conf

NameVirtualHost *:80
<VIRTUALHOST *:80>
ServerName <a href="http://www.b.com">www.b.com</a>
DocumentRoot "D:/web/php站點目錄"
</VIRTUALHOST >
<VIRTUALHOST *:80>
ServerName <a href="http://www.a.com">www.a.com</a>
ProxyPass / <a href="http://www.a.com:81/">http://www.a.com:81/</a>
ProxyPassReverse / <a href="http://www.a.com:81/">http://www.a.com:81/</a>
</VIRTUALHOST>