Why does converting this Python POST request to Java not work?

I'm trying to convert this Python code using the Python Requests HTTP library into Java code (for Android).

import requests
payload = {"attr[val1]":123,

r = requests.post("http://jakiro.herokuapp.com/api", data=payload)

This is what I've done so far:

protected void sendJson() {
    Thread t = new Thread() {

        public void run() {
            Looper.prepare(); //For Preparing Message Pool for the child Thread
            HttpClient client = new DefaultHttpClient();
            HttpConnectionParams.setConnectionTimeout(client.getParams(), 10000); //Timeout Limit
            HttpResponse response;
            JSONObject json = new JSONObject();

            try {
                Log.v("SOMETHING_NAME3", "Creating POST");
                HttpPost post = new HttpPost("http://jakiro.herokuapp.com/api");
                json.put(MessageAttribute.SURNAME, "Bar");
                json.put(MessageAttribute.VAL1, 123);
                json.put(MessageAttribute.VAL2, 456);
                json.put(MessageAttribute.name, "Foo");
                json.put(MessageAttribute.TIME, 0);
                StringEntity se = new StringEntity( json.toString() );
                se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
                response = client.execute(post);

                /*Checking response */
                    InputStream in = response.getEntity().getContent(); //Get the data in the entity
                    String foo = convertStreamToString(in);
                    Log.v("SOMETHING_NAME2", foo); // Gives me "Bad request"

            } catch(Exception e) {
                Log.v("SOMETHING_NAME", "Cannot Establish Connection");

            Looper.loop(); //Loop in the message queue


I've checked the response with response.getStatusLine().getStatusCode() and I get back a 400 from the server. The Python code works fine, but in Java on an Android device it doesn't. I can't see to figure out why though.


@Blender's link was the correct solution at the link: How to use parameters with HttpPost

The correct way to url-encode was to create BasicNameValuePairs and encode that as such:

postParameters = new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("param1", "param1_value"));
postParameters.add(new BasicNameValuePair("param2", "param2_value"));

httppost.setEntity(new UrlEncodedFormEntity(postParameters));

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