Node.js HTTPParser doesn't call some of the callbacks

I'm playing with HTTPParser in Node.js v0.8.15. Unfortunately, some of the callbacks never get called.

For example, the following code invokes only onHeadersComplete. Couldn't manage to make it call onURL, onHeaderField and onHeaderValue.

var
    HTTPParser = process.binding('http_parser').HTTPParser,
    parser = new HTTPParser(HTTPParser.REQUEST),
    request = new Buffer(
        'GET /test HTTP/1.1\r\n' +
        'Host: www.example.com\r\n' +
        'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/17.0 Firefox/17.0\r\n' +
        'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n' +
        'Accept-Language: en-US,en;q=0.5\r\n' +
        'Accept-Encoding: gzip, deflate\r\n' +
        '\r\n'
    );

parser.onURL = function() {
    console.log('onURL');
}

parser.onHeaderField = function() {
    console.log('onHeaderField');
}

parser.onHeaderValue = function() {
    console.log('onHeaderValue');
}

parser.onHeadersComplete = function() {
    console.log('onHeadersComplete');
}

parser.execute(request, 0, request.length);

What's wrong?