PHP warning is issued, when the document root is a link
Because of failing to validate the path in case the document root is a link the following warning is issued:
PHP Warning: No valid path was registered for class 'Zend_Loader'. in /foobar/typo3conf/ext/typo3_webservice/library/Typo3Rpc_Autoload.php on line 123
The webservice will not work because it fails to include the Zend framework.