Unsupported media type 

i test with this tutorial : http://besim.pl  

In the function hello i have : 

return sprintf('Hello %s!', $name);

and i have this response : 

[exception] 415 | Unsupported Media Type | Symfony\Component\HttpKernel\Exception\UnsupportedMediaTypeHttpException
[message] Format 'soap' not supported, handler must be implemented
