Enforce Lower Case URLs

Add the following rule to your web.config’s <rules> section:

<system.webServer>
    <rewrite>
        <rules>
            <rule name="Convert to lower case" stopProcessing="true">
                <match url=".*[A-Z].*" ignoreCase="false" />
                <action type="Redirect" url="{ToLower:{R:0}}" redirectType="Permanent" />
            </rule>
        </rules>
    </rewrite>
</system.webServer>