为什么这个url生成404未找到异常？

I need your help to understand this behavior. I have defined this url in SlimFramework :

$app->get('/media', function () {
    echo "Test";
});

I have an error "404 not found exception" when i enter this url in my browser. If i change this url to anything else like :

$app->get('/test', function () {
    echo "Test";
});

This works and displays "Test" in my browser. Is the route /media is a reserve rule or something like this. All other routes works great so i think it is not a config mistake.