public static function parse_rest_path($uri=false, $SERVER_SCRIPT_NAME=false /* unit test only */) {
        if ( ! $SERVER_SCRIPT_NAME ) $SERVER_SCRIPT_NAME = $_SERVER["SCRIPT_NAME"];  // /py4e/koseu.php
        if ( ! $uri ) $uri = $_SERVER['REQUEST_URI'];     // /py4e/lessons/intro/happy
        // Remove Query string...
        $pos = strpos($uri, '?');
        if ( $pos !== false ) $uri = substr($uri,0,$pos);
        $cwd = dirname($SERVER_SCRIPT_NAME);
        if ( strpos($uri,$cwd) !== 0 ) return false;

        $controller = '';
        $extra = '';
        $remainder = substr($uri, strlen($cwd));
        if ( strpos($remainder,'/') === 0 ) $remainder = substr($remainder,1);
        if ( strlen($remainder) > 1 ) {
            $pieces = explode('/',$remainder,2);
            if ( count($pieces) > 0 ) $controller = $pieces[0];
            if ( count($pieces) > 1 ) $extra = $pieces[1];
        }

        if ( $cwd == '/' ) $cwd = '';
        $retval = array($cwd, $controller, $extra);
        return $retval;
    }