title: asihttp post multi files
body: <p>I hope to use ASIHttp post multi files
  Is it possible. For one file, I know the codes are:</p>
  
  <pre><code>     [request setFile:[documentsDirectory stringByAppendingPathComponent:@"img1.png"] forKey:@"img"];
  </code></pre>
  
  <p>all image files have same key "img"</p>
  
  <p>Welcome any comment</p>