HttpPost httpPost = new HttpPost(url_src);
HttpParams httpParameters = new BasicHttpParams();
httpclient.setParams(httpParameters);
StringEntity se = new StringEntity(str,"UTF-8");
    se.setContentType("application/json");
httpPost.setEntity(se);

     httpPost.setHeader("userId", ""+userId);//userID
     httpPost.setHeader("machineId", machineId);//deviceUserMachineID

     response = httpclient.execute(httpPost);