<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
            <rules>
                <rule name="301Redirect" stopProcessing="true">
                    <match url="(.*)" />
                    <conditions logicalGrouping="MatchAny">
                        <add input="{HTTP_HOST}" pattern="^abc1.com$" />
                        <add input="{HTTP_HOST}" pattern="^abc2.com$" />
                    </conditions>
                    <action type="Redirect" url="http://www.abc1.com/{R:0}" redirectType="Permanent" />
            </rule>
        </rules>
    </rewrite>
</system.webServer>