Laravel route with where clause not working as expected

I've got the following routes, which both work fine:

Route::get('/de', 'FrontpageController@index');

Route::get('/fr', 'FrontpageController@index');

The plan was to combine them into one statement, like described in this apparently working solution: https://stackoverflow.com/a/34404404/4688612

So the new code looks like this:

Route::get('/{url}', 'FrontpageController@index')->where('url', 'de|fr');

But, I get This page isn’t working. example.test redirected you too many times.

What am I not getting here?

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