Android HTTP post request response is page not found

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Android

JSON

request

I am Creating Android App has a Http request as following:

.Call API http://MY API/GetMessage

.take parameter id as JSON string Post request

.Go to another Activity to show the return message

.hint URL like that http://MY API/GetMessage?id= {%22Id%22:%221%22,%22UserName%22:%John%22}

I wrote my code to get the message from the request response but the response is 404 Page not found and i don't know the reason,this is my code :

What I have tried:

HttpPost httpPost = new HttpPost(url);
            HttpClient httpClient = new DefaultHttpClient();

            try {

                JSONObject json = new JSONObject();
                json.put("Id", 1);
                json.put("UserName", "userName");
                StringEntity se = new StringEntity( json.toString());
                httpPost.setEntity(se);
                HttpResponse response = httpClient.execute(httpPost);
                String result = EntityUtils.toString(response.getEntity());
                return result;