title: XHR.send(file + params)?
body: <p>I am trying to figure out how to send a file and paramaters within the same XMLHttpRequest. Is this possible?</p>
  
  <p>Obviously I can do xhr.send(file+params) or xhr.(file,params). And I don't think I can set two different request headers to do this...</p>
  
  <pre><code>xhr.setRequestHead('X_FILENAME', file.name)
  xhr.send(file);
  xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  xhr.send(params);
  </code></pre>
  
  <p>Is there some way to send the params without having to use GET, or a secondary xhr request?</p>