AWS S3 Javascript in the browser error

I'm trying out the AWS Javascript SDK, I wrote a simple code based on the examples to get the list of files in a bucket. But I keep getting NetworkingError: Network Failure, and can't find any references to this error in the docs.

I also get the same error when I try a getObject.

My code:

AWS.config.update({
    accessKeyId : 'myaccesskey',
    secretAccessKey : 'mysecretkey'
});
AWS.config.region = 'us-west-2';

function list(){
    var bucket = new AWS.S3({params: {Bucket: 'myBucket'}});
      bucket.listObjects(function (err, data) {
        if (err) {
            alert(err);
        } else {
            document.getElementById('status').innerHTML = 'Loaded ' + data.Contents.length + ' items from S3';
            for (var i = 0; i < data.Contents.length; i++) {
            document.getElementById('objects').innerHTML +=
                   '<li>' + data.Contents[i].Key + '</li>';
             }
        }
      });
}

I configured CORS to accept GET from all locations.

<CORSConfiguration>
  <CORSRule>
   <AllowedOrigin>*</AllowedOrigin>
   <AllowedMethod>GET</AllowedMethod>
 </CORSRule>
</CORSConfiguration>

What am I missing here?