How to get response status 404 in casper.js within

Any idea why code below doesn't catch 404 in either response var or in the http.status.404 event?

I run this with phantomjs 1.9, casperjs 1.0.2 and Windows 7

var casper = require("casper").create(),
    utils = require('utils');

casper.start();

casper.thenOpen('http://www.google.com/sadfafsdgfsd', function(response) {
  casper.capture('test.png');
  utils.dump(response);
});

casper.on('http.status.404', function(resource) {
  this.echo('wait, this url is 404: ' + resource.url);
});

casper.run(function() {
  console.log('End');
  casper.exit();
});

Ideally I like to catch 404 within thenOpen(). How to do that?

UPDATE 1:

I tried this

casper.thenOpen('http://www.google.com/sadfafsdgfsd', function(response) {
  casper.capture('test.png');
  utils.dump(response);

    if(this.status(false)['currentHTTPStatus'] === 404) {
        console.log('Error 404');
    } else {
        console.log('No Error 404');
    }

});

And here is the output:

undefined
No Error 404
End

It still doesn't make sense.

UPDATE 2:

I tried 404checker.js here https://gist.github.com/n1k0/4509789

casperjs 404.js http://www.google.com/sadfafsdgfsd

Output:

URI.js loaded
Starting
http://www.google.com/sadfafsdgfsd
http://www.google.com/sadfafsdgfsd is okay (HTTP 200)
1 new links found on http://www.google.com/sadfafsdgfsd
All done, 1 links checked.

So what's going on!?

I just ran your code and it seems to be working fine for catching the 404 error in the on event. If you want to catch it within the thneOpen(), something like this would work:

casper.thenOpen('http://www.google.com/sadfafsdgfsd', function() {
    if(this.status(false)['currentHTTPStatus'] === 404) {
        console.log('Error 404');
    } else {
        console.log('No Error 404');
    }
});

Or you could use the response directly, response['status'] will be 404 in this case.

casper.thenOpen('http://www.google.com/sadfafsdgfsd', function(response) {
    if(response['status'] === 404) {
        console.log('Error 404');
    } else {
        console.log('No Error 404');
    }
});