apache中基于主机url的条件反向代理

Question

我有两个网站在 apache 中部署在两个端口 81 和 82

<VirtualHost *:81>
    DocumentRoot "D:/WebApps/App1"
    ServerName localhost
    <Directory "D:/WebApps/App1">
        Require all granted
    </Directory>        
</VirtualHost>

<VirtualHost *:82>
    DocumentRoot "D:/WebApps/App2"
    ServerName localhost
    <Directory "D:/WebApps/App2">
        Require all granted
    </Directory>
</VirtualHost>

我已经进行了如下两个 DNS 条目

app1.domain.com <server ip>
app2.domain.com <server ip>

我想在端口上配置反向代理80，以便使用 发出的请求app1.domain.com被代理到端口81，使用 发出的请求app2.domain.com被代理到端口82

到目前为止我已经尝试过 -

<VirtualHost app1.domain.com:80>
    ProxyPreserveHost On
    ProxyRequests Off
    ServerName app1.domain.com
    ServerAlias app2.domain.com
    ProxyPass / http://localhost:81/
    ProxyPassReverse / http://localhost:81/
</VirtualHost>

<VirtualHost app2.domain.com:80>
    ProxyPreserveHost On
    ProxyRequests Off
    ServerName app1.domain.com
    ServerAlias app2.domain.com
    ProxyPass / http://localhost:82/
    ProxyPassReverse / http://localhost:82/
</VirtualHost>

但是两个域的请求都被发送到端口 81。有人能提出解决方案吗？