When attempting to use php micro frameworks on 1and1, the key is having the correct .htaccess file

if should look like this:
Options +FollowSymLinks -MultiViews

AddType x-mapp-php6 .php
AddHandler x-mapp-php6 .php

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php [QSA,L]