使用web.config将根域重写到不同的路径，然后重写为子域

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <system.webServer>
    <rewrite>
      <!-- 将根域重写到特定路径 -->
      <rules>
        <rule name="RootToOldPath" stopProcessing="true">
          <match url="^$" />
          <action type="Redirect" url="/old-path" redirectType="Permanent" />
        </rule>
      </rules>
      
      <!-- 将特定路径重写为子域 -->
      <rules>
        <rule name="OldPathToSubdomain" stopProcessing="true">
          <match url="^old-path/(.*)" />
          <conditions>
            <add input="{HTTP_HOST}" pattern="^example\.com$" />
          </conditions>
          <action type="Redirect" url="http://{C:1}.example.com/{R:1}" redirectType="Permanent" />
        </rule>
      </rules>
    </rewrite>
  </system.webServer>
</configuration>