public void login(Context context, String account, String password,    AsyncHttpResponseHandler responseHandler) {
          AppUtil.setAuthHeader(context, client);
         RequestParams params = new RequestParams();
         params.put("account", account);
         params.put("password", password);
         params.put("from", 1);
         client.post(context, IClientUrl.login(), params, responseHandler);

http status 400   The request sent by the client was syntactically incorrect