DetailActivity.java

    private void sendRequest(int zodiacID, int gender) {
        
        JSONObject params = new JSONObject();
        try {
            params.put(PARAM_ZODIAC_ID, String.valueOf(zodiacID));
            params.put(PARAM_GENDER_ID, String.valueOf(gender));
            params.put(PARAM_DATE, mDate);
        } catch (JSONException e) {
            e.printStackTrace();
        }

        url += Func.decrypt(CIPHER_URL, new String[]{KEY_URL_1, KEY_URL_2});
        JsonObjectRequest objReq = new JsonObjectRequest(Request.Method.POST, url, params,
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        Log.d(TAG, "Response: " + response.toString());
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {
                        Log.d(TAG, "Server Error: " + volleyError.toString());
                    }
                }) {
            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                Map<String, String> headers = new HashMap<>();
                headers.put("Content-Type", "application/json");
                headers.put("apikey", Func.decrypt(CIPHER_KEY, new String[]{KEY_KEY_1, KEY_KEY_2})); // e090ee4b74cf2ec5cds1sad2f3sdc
                return headers;
            }
        };
        AppController.getInstance().addToRequestQueue(objReq);
    }

getData.php

<?php
if (!function_exists('apache_request_headers')) {
        function apache_request_headers() {
            foreach($_SERVER as $key=>$value) {
                if (substr($key,0,5)=="HTTP_") {
                    $key=str_replace(" ","-",ucwords(strtolower(str_replace("_"," ",substr($key,5)))));
                    $out[$key]=$value;
                }else{
                    $out[$key]=$value;
        }
            }
            return $out;
        }
}

$body = file_get_contents('php://input');
$postvars = json_decode($body, true);

$headers =  apache_request_headers();

$apiKey = "apikey"; 
if(isset($headers[$apiKey])){
        if($headers[$apiKey]=="e090ee4b74cf2ec5cds1sad2f3sdc"){
            $response['status'] = TRUE;
            $response["data"]="Response data";
        }else{
            $response['status'] = FALSE;
            $response["message"]="invalid api key";
        }
}else{
    $response['status'] = FALSE;
    $response["message"]="Vui lòng cập nhật ứng dụng";
}

echo json_encode($response);
?>