Redirect based on browser language

web.config

<rule name="RedirectToDutchHomepage" enabled="true" stopProcessing="true">
          <match url="^$"></match>
          <conditions>
            <add input="{HTTP_ACCEPT_LANGUAGE}" pattern="^nl"></add>
          </conditions>
          <action type="Redirect" url="https://{HTTP_HOST}/nl/"></action>
        </rule>
        <rule name="RedirectToFrenchHomepage" enabled="true" stopProcessing="true">
          <match url="^$"></match>
          <conditions>
            <add input="{HTTP_ACCEPT_LANGUAGE}" pattern="^fr"></add>
          </conditions>
          <action type="Redirect" url="https://{HTTP_HOST}/fr/"></action>
        </rule>
        <rule name="RedirectToGermanHomepage" enabled="true" stopProcessing="true">
          <match url="^$"></match>
          <conditions>
            <add input="{HTTP_ACCEPT_LANGUAGE}" pattern="^de"></add>
          </conditions>
          <action type="Redirect" url="https://{HTTP_HOST}/de/"></action>
        </rule>
        <rule name="RedirectToEnglishHomepage" enabled="true" stopProcessing="true">
          <match url="^$"></match>         
          <action type="Redirect" url="https://{HTTP_HOST}/en/"></action>
        </rule>

This will redirect the user based on browser language.
If nl, fr or de is detected in the browser language it will be redirected to the homepage ofr that language
If not the user will be redirected to the english homepage