Resources/contao/api/index.php
protected function getFragmentsFromUrl()
        {

            // Return null on empty request path
            if (\Environment::get('request') == '') {
                return null;
            }

            $test = \Environment::get('request');

            // Get the request string without the index.php fragment
            if (\Environment::get('request') == $this->_sApiUrl . 'index.php') {
                $strRequest = '';
            } else {
                list($strRequest) = explode('?', str_replace($this->_sApiUrl . 'index.php/', '', \Environment::get('request')), 2);
            }

            // Remove api fragment
            if (substr($strRequest, 0, strlen($this->_sApiUrl)) == $this->_sApiUrl) {
                $strRequest = substr($strRequest, strlen($this->_sApiUrl));
            }

            // URL decode here
            $strRequest = rawurldecode($strRequest);
            $strRequest = substr($strRequest,1);

            // return the fragments
            return explode('/', $strRequest);
        }
protected function getFragmentsFromUrl()
        {

            // Return null on empty request path
            if (\Environment::get('request') == '') {
                return null;
            }

            $test = \Environment::get('request');

            // Get the request string without the index.php fragment
            if (\Environment::get('request') == $this->_sApiUrl . 'index.php') {
                $strRequest = '';
            } else {
                list($strRequest) = explode('?', str_replace($this->_sApiUrl . 'index.php/', '', \Environment::get('request')), 2);
            }

            // Remove api fragment
            if (substr($strRequest, 0, strlen($this->_sApiUrl)) == $this->_sApiUrl) {
                $strRequest = substr($strRequest, strlen($this->_sApiUrl));
            }

            // URL decode here
            $strRequest = rawurldecode($strRequest);
            $strRequest = substr($strRequest,1);

            // return the fragments
            return explode('/', $strRequest);
        }
Split the request into fragments and find the api resource