Removing UTF8 BOM if the response is parsed and returned as String, Closes android-async-http#659

Author: smarek

library/src/main/java/com/loopj/android/http/AsyncHttpResponseHandler.java

@@ -93,6 +93,7 @@ public abstract class AsyncHttpResponseHandler implements ResponseHandlerInterfa
     protected static final int BUFFER_SIZE = 4096;
 
     public static final String DEFAULT_CHARSET = "UTF-8";
+    public static final String UTF8_BOM = "\uFEFF";
     private String responseCharset = DEFAULT_CHARSET;
     private Handler handler;
     private boolean useSynchronousMode;

library/src/main/java/com/loopj/android/http/JsonHttpResponseHandler.java

@@ -213,6 +213,9 @@ protected Object parseResponse(byte[] responseBody) throws JSONException {
         String jsonString = getResponseString(responseBody, getCharset());
         if (jsonString != null) {
             jsonString = jsonString.trim();
+            if (jsonString.startsWith(UTF8_BOM)) {
+                jsonString = jsonString.substring(1);
+            }
             if (jsonString.startsWith("{") || jsonString.startsWith("[")) {
                 result = new JSONTokener(jsonString).nextValue();
             }

library/src/main/java/com/loopj/android/http/TextHttpResponseHandler.java

@@ -114,7 +114,10 @@ public void onFailure(int statusCode, Header[] headers, byte[] responseBytes, Th
      */
     public static String getResponseString(byte[] stringBytes, String charset) {
         try {
-            return stringBytes == null ? null : new String(stringBytes, charset);
+            String toReturn = (stringBytes == null) ? null : new String(stringBytes, charset);
+            if (toReturn != null && toReturn.startsWith(UTF8_BOM))
+                return toReturn.substring(1);
+            return toReturn;
         } catch (UnsupportedEncodingException e) {
             Log.e(LOG_TAG, "Encoding response into string failed", e);
             return null;