loopj/android-async-http — pull request #307 by mrtristan (2013-09-10 15:57:40+00:00)
Title: added HEAD request capabilities

sample usage:

```java
TwitterRestClient.head("statuses/public_timeline.json", null, new AsyncHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers, String content) {
System.out.println("----header start----");
for(final Header h : headers) {
System.out.println(h.getName() + ":" + h.getValue());
}
System.out.println("----header finish----");
}
});
```