Ajax request with prototype - what is transport if not only responseText?

Posted by Delirium tremens on Stack Overflow See other posts from Stack Overflow or by Delirium tremens
Published on 2009-06-24T10:09:46Z Indexed on 2010/05/25 9:01 UTC
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This is an example code from the prototype site.

var url = '/proxy?url=' + encodeURIComponent('http://www.google.com/search?q=Prototype');
// notice the use of a proxy to circumvent the Same Origin Policy.

new Ajax.Request(url, {
  method: 'get',
  onSuccess: function(transport) {
    var notice = $('notice');
    if (transport.responseText.match(/href="http:\/\/prototypejs.org/))
      notice.update('Yeah! You are in the Top 10!').setStyle({ background: '#dfd' });
    else
      notice.update('Damn! You are beyond #10...').setStyle({ background: '#fdd' });
  }
});

The data that comes from the ajax request is available at transport.responseText, but what is transport if not only responseText?

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