Klein routes don't return anything - php

Question

I've got this code in my index.php
<?php
require 'vendor/autoload.php';
$router = new \Klein\Klein();
$router->respond('/hello-world', function () {
return 'Hello World!';
});
$router->dispatch();
and htaccess:
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule . /index.php [L]
and when i try to open /hello-world (or index.php/hello-world) it just gives me a blank white screen.
If i have only this route:
$router->respond(function () {
return 'All the things';
});
it works on index.php/ but not on /
I'm looking for a long time but can't see whats wrong?

Answer 1

Try this and change /path/to/app with your real path to the app
define('APP_PATH', '/path/to/app');
require_once 'vendor/autoload.php';
$request = \Klein\Request::createFromGlobals();
$request->server()->set('REQUEST_URI', substr($_SERVER['REQUEST_URI'], strlen(APP_PATH)));
$klein = new \Klein\Klein();
$klein->respond('GET', '/hello', function () {
return 'Hello World!';
});
$klein->dispatch($request);

Answer 2

It looks like the rewrite does not work. Just try to echo something simple in the php without any framework like so:
index.php (only these three lines)
<?php
echo 'does it work?';
?>
Then try to call something like /hello-world. If it does not show your message, maybe your host does not support mod_redirect.
You should be able to display all activated apache modules with the function apache_get_modules:
<?php
print_r(apache_get_modules());
?>
There should be mod_rewrite listed.