Android HttpPost request exception

Question

Just as a demonstration the code will work, I am attempting to fetch some JSON data within my oncreate function. I know it should run on a different thread but I want to be sure the code successfully fetches my JSON before moving it into its own thread.

The code is below:

        @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);

        /***************************************************/
        final String TAG = "PostFetcher";
        final String SERVER_URL = "http://kylewbanks.com/rest/posts";
//        final String TAG = "PostsActivity";
//        List<Post> posts;

        try {
            //Create an HTTP client
            HttpClient client = new DefaultHttpClient();
            HttpPost post = new HttpPost(SERVER_URL);

            //Perform the request and check the status code
            HttpResponse response = client.execute(post);
            StatusLine statusLine = response.getStatusLine();

            if(statusLine.getStatusCode() == 200) {
                HttpEntity entity = response.getEntity();
                InputStream content = entity.getContent();

                try {
                    //Read the server response and attempt to parse it as JSON
                    Reader reader = new InputStreamReader(content);

                    GsonBuilder gsonBuilder = new GsonBuilder();
                    gsonBuilder.setDateFormat("M/d/yy hh:mm a");
                    Gson gson = gsonBuilder.create();
                    List<JsonObject> posts = new ArrayList<JsonObject>();

                    Log.e(TAG, "Checking: " + posts);

//                    posts = Arrays.asList(gson.fromJson(reader, JsonObject[].class));
                    content.close();

                } catch (Exception ex) {
                    Log.e(TAG, "Failed to parse JSON due to: " + ex);
                }
            } else {
                Log.e(TAG, "Server responded with status code: " + statusLine.getStatusCode());
            }
        } catch(Exception ex) {
            Log.e(TAG, "Failed to send HTTP POST request due to: " + ex);
        }
}

When I run the code, I get the second to last exception message:

Server responded with status code: 500

What am I doing wrong?

Answer 1

You are sending a HttpPost request to (obviously) an website that uses RESTful styled API.

This means, it works with HTTP Verbs (GET, POST, PUT, DELETE).

If you want to read data and the read access never changes data, use GET.

If you want to update or replace data, user PUT or POST (put usually to replace, POST to change/add). However, JavaScript does (or did) only support GET and POST requests, so keep that in mind.

If you want to delete a resource or collection, use DELETE.

That being said: If you want to load data, use Get in your case HttpGet instead of HttpPost.

Also read more about RESTful web APIs.

Edit: In fact, calling the given URL in Fiddler2 (as stated in the comment on the other answer) results a HTML website reporting the error:

You called this URL via POST, but the URL doesn't end in a slash and you have APPEND_SLASH set. Django can't redirect to the slash URL while maintaining POST data. Change your form to point to kylewbanks.com/rest/posts/ (note the trailing slash), or set APPEND_SLASH=False in your Django settings.

Answer 2

Its internal server error..check if there are any exceptions are getting thrown at server side.

It has nothing to do with your android code, the problem is at server.

You can use AsyncTask to run network/filesystem related operations.