Hi all,
I qoute from 
https://developer.mozilla.org/En/Using_XMLHttpRequest#Handling_binary_data

in javascript is possible, using the The XMLHttpRequest Level 2 
Specification adds new responseType 
attributes<http://www.w3.org/TR/XMLHttpRequest2/#the-responsetype-attribute>which
 make sending and receiving binary data much easier.

Something like this:
var xhr = new XMLHttpRequest();
xhr.open("GET", url, true);  
xhr.requestType = "arraybuffer";   
xhr.onload = function(e)
{  
  var arraybuffer = xhr.response; // not responseText  
  /* ... */  
}  
xhr.send();  

How to get this in GWT? The class XMLHttpRequest has not a 
setResponseType(...) method and also has not a getResponse() method to get 
data, for example, as a byte[] or something similar, but has only a 
getResponseText() method. Is there a way to solve this?

Thanks.

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