@Override
 public byte[] getBody() {
   try {
     return mRequestBody == null ? null : mRequestBody.getBytes(PROTOCOL_CHARSET);
   } catch (UnsupportedEncodingException uee) {
     VolleyLog.wtf(
         "Unsupported Encoding while trying to get the bytes of %s using %s",
         mRequestBody, PROTOCOL_CHARSET);
     return null;
   }
 }