Sending a parameterized HTTP POST request from Android

Question

Question:

I am having trouble accessing cloud data from an Android device. I am using the POST method and expecting a JSON response. I believe I am getting 403 (forbidden) error. But I can access the same data using curl. So I believe I am doing something wrong thus seeking someones assistance.

Background

Here is the curl command string that I am trying to replicate. I receive a valid response to this command.

curl -X POST --data "token={String}&param1={int}&param2={int}" https://www.example.com/api/dir1/dir2"

Below is the android code.

        String post_url = "https://www.example.com/api/dir1/dir2";
        Thread thread = new Thread(new Runnable() {
        public void run() {
            try {

                String urlParameters = "token={Key-string}&param1={int}&param2={int}";
                byte[] postData = urlParameters.getBytes();
                int postDataLength = postData.length;

                URL url = new URL(post_url);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setReadTimeout(10000 /* milliseconds */);
                conn.setConnectTimeout(15000 /* milliseconds */);
                conn.setRequestMethod("POST");
                conn.setRequestProperty("Accept", "application/json");
                conn.setRequestProperty("charset", "utf-8");
                conn.setRequestProperty("Content-Length",Integer.toString(postDataLength));
                conn.setDoInput(true);
                conn.setDoOutput(true);
                conn.connect();

                OutputStream os = conn.getOutputStream();
                os.write(urlParameters.toString().getBytes("UTF-8"));
                os.close();

                InputStream stream = conn.getInputStream();

                BufferedReader in = new BufferedReader( new InputStreamReader(stream ));
                String data = null;
                StringBuffer response = new StringBuffer();

                while ((data = in.readLine()) != null) {
                    response.append(data);}
                in.close();

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });

    thread.start();

References:

I am not too sure. I looked at some of the examples stackoverflow and have being trying different things. But if you look at the curl command I don't specify any types. I think it is a default type. — Mahendra Gunawardena, Feb 21 '16 at 13:01
You should be sure about the meaning of 403 first was what i said. Look it up. — greenapps, Feb 21 '16 at 13:03
And i asked what the type was of the variable urlParameters in your code. — greenapps, Feb 21 '16 at 13:04
I did google 403 and it came back as forbidden. But since to curl command works I don't it is an issue with the token key or the parameters. But the type of urlParameters I am just trying things base on what I read on stackoverflow — Mahendra Gunawardena, Feb 21 '16 at 13:06
The urlparameters are Param1=token key (string), Param2 int and Param3 is int — Mahendra Gunawardena, Feb 21 '16 at 13:08
If you are asked what the type of your variable urlParameters is you are supposed to say hat it is String or integer or whatever what it is. How did you declare it? — greenapps, Feb 21 '16 at 13:17
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/104093/discussion-between-mahendra-gunawardena-and-greenapps). — Mahendra Gunawardena, Feb 21 '16 at 13:22
Its hard code. Using Okhttp or volley make our life more easy — Vlad, Feb 21 '16 at 14:54

score 1 · Answer 1 · answered Feb 21 '18 at 16:31

You can try make your call in Postman (google chrome plugin), and then click in Code link. Postman will generate to you a request in many types of languages, like PHP, java, C, etc.

For example:

Add to your gradle:

compile 'com.squareup.okhttp3:okhttp:3.5.0'

Make call in somewhere:

    new Thread() {
       public void run() {
           makeCall();
       }
    }.start();

Create that class:

    public void makeCall() {

    OkHttpClient client = new OkHttpClient();

    MediaType mediaType = MediaType.parse("application/json");
    RequestBody body = RequestBody.create(mediaType, "{\n   \"param1\":\"data1\"}");
    Request request = new Request.Builder()
            .url("https://your_url_here")
            .post(body)
            .addHeader("content-type", "application/json")
            .addHeader("cache-control", "no-cache")
            .build();

    try {
        Response response = client.newCall(request).execute();

        Log.e("okmsg1", response.toString());
        Log.e("okmsg2", response.message());
        Log.e("okmsg3", response.body().string());

    } catch (IOException e) {
        Log.e("err", e.getMessage());
    }

}

Sending a parameterized HTTP POST request from Android

1 Answers1