Added HEAD request support, Closes android-async-http#307, Fixes android-async-http#146

Author: smarek

library/src/com/loopj/android/http/AsyncHttpClient.java

@@ -35,6 +35,7 @@
 import org.apache.http.client.methods.HttpDelete;
 import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
 import org.apache.http.client.methods.HttpGet;
+import org.apache.http.client.methods.HttpHead;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.client.methods.HttpPut;
 import org.apache.http.client.methods.HttpUriRequest;
@@ -302,6 +303,67 @@ public void cancelRequests(Context context, boolean mayInterruptIfRunning) {
         requestMap.remove(context);
     }
 
+    //
+    // HTTP HEAD Requests
+    //
+
+    /**
+     * Perform a HTTP HEAD request, without any parameters.
+     * @param url the URL to send the request to.
+     * @param responseHandler the response handler instance that should handle the response.
+     */
+    public void head(String url, AsyncHttpResponseHandler responseHandler) {
+        head(null, url, null, responseHandler);
+    }
+
+    /**
+     * Perform a HTTP HEAD request with parameters.
+     * @param url the URL to send the request to.
+     * @param params additional HEAD parameters to send with the request.
+     * @param responseHandler the response handler instance that should handle the response.
+     */
+    public void head(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
+        head(null, url, params, responseHandler);
+    }
+
+    /**
+     * Perform a HTTP HEAD request without any parameters and track the Android Context which initiated the request.
+     * @param context the Android Context which initiated the request.
+     * @param url the URL to send the request to.
+     * @param responseHandler the response handler instance that should handle the response.
+     */
+    public void head(Context context, String url, AsyncHttpResponseHandler responseHandler) {
+        head(context, url, null, responseHandler);
+    }
+
+    /**
+     * Perform a HTTP HEAD request and track the Android Context which initiated the request.
+     * @param context the Android Context which initiated the request.
+     * @param url the URL to send the request to.
+     * @param params additional HEAD parameters to send with the request.
+     * @param responseHandler the response handler instance that should handle the response.
+     */
+    public void head(Context context, String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
+        sendRequest(httpClient, httpContext, new HttpHead(getUrlWithQueryString(url, params)), null, responseHandler, context);
+    }
+
+    /**
+     * Perform a HTTP HEAD request and track the Android Context which initiated
+     * the request with customized headers
+     *
+     * @param url the URL to send the request to.
+     * @param headers set headers only for this request
+     * @param params additional HEAD parameters to send with the request.
+     * @param responseHandler the response handler instance that should handle
+     *        the response.
+     */
+    public void head(Context context, String url, Header[] headers, RequestParams params, AsyncHttpResponseHandler responseHandler) {
+        HttpUriRequest request = new HttpHead(getUrlWithQueryString(url, params));
+        if(headers != null) request.setHeaders(headers);
+        sendRequest(httpClient, httpContext, request, null, responseHandler,
+                context);
+    }
+
 
     //
     // HTTP GET Requests

library/src/com/loopj/android/http/BinaryHttpResponseHandler.java

@@ -147,7 +147,7 @@ protected void handleMessage(Message msg) {
         switch (msg.what) {
             case SUCCESS_MESSAGE:
                 response = (Object[]) msg.obj;
-                handleSuccessMessage(((Integer) response[0]).intValue(), (byte[]) response[1]);
+                handleSuccessMessage((Integer) response[0], (byte[]) response[1]);
                 break;
             case FAILURE_MESSAGE:
                 response = (Object[]) msg.obj;