POSTing JSON and retrieving a response in Android

Question

I am trying to post a JSON message to a site and to retrieve a JSON message back.
java.net.ProtocolException: method does not support a request body: POST Does anyone know what is wrong? Thanks in advance

                 HttpURLConnection conn=null;
        try{
            URL url=new URL(urlString);
            String userPassword = userName +":" + passWord;
            byte[] bytes=Base64.encode(userPassword.getBytes(),Base64.DEFAULT);
            String stringEncoding = new String(bytes, "UTF-8");

             conn = (HttpURLConnection) url.openConnection();
             conn.setReadTimeout(10000 /* milliseconds */);
             conn.setConnectTimeout(15000 /* milliseconds */);
             conn.setDoOutput(true);
             conn.setDoInput(true);
             conn.setRequestMethod("POST");
            conn.setRequestProperty ("Authorization", "Basic " + stringEncoding);
            conn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
            Log.i("Net", "length="+conn.getContentLength());
            Log.i("Net", "contentType="+conn.getContentType());
            Log.i("Net", "content="+conn.getContent());
            conn.connect();

        }catch(Exception e){
            Log.d("Url Formation Connection", e.toString());
        }

//output{ try{

            String requestString="{“ ";


            wr = new OutputStreamWriter(conn.getOutputStream());
            wr.write(requestString.toString());
            wr.flush();

    //input{
        BufferedReader rd = null;
        String response=" ";


            is = conn.getInputStream();
            rd = new BufferedReader(new InputStreamReader(is));
            String line;
            StringBuffer responseBuff = new StringBuffer();
            while ((line = rd.readLine()) != null) {
                // Process line...
                responseBuff.append(line);
            }
            response = responseBuff.toString();
            Log.d("response", response);
        }catch(Exception e){
            Log.d("buffer error", e.toString());
        }finally {
            if (is != null) {
                try {
                    wr.close();
                    is.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }

I'm not sure about this line: conn.setRequestProperty("Content-Type", "application/json;charset=utf-8"); try ("Content-Type", "application/json") — Lucas Arrefelt, Oct 29 '12 at 19:55
I took your suggestion but it didn't change the error message. — user1739356, Oct 29 '12 at 20:12

score 3 · Accepted Answer · answered Oct 30 '12 at 14:27

3

It could be that the server you're connecting to doesn't allow POST operations. I would try a GET request first, to see if you have permissions for that web service method.

Also, you could try your luck with a simpler HttpClient, although I haven't tested this solution myself: http://www.geekmind.net/2009/11/android-simple-httpclient-to.html

answered Oct 30 '12 at 14:27

user1785868

54
2

Thank you very much for your help. I will try HttpClient. – user1739356 Oct 30 '12 at 16:29
I have been trying with HttpClient and I am getting the same result. – user1739356 Oct 30 '12 at 20:43
Its probably a server side problem like you said. Thanks! – user1739356 Oct 31 '12 at 13:35

score 1 · Answer 2 · answered Oct 29 '12 at 19:56

Just a guess but can you try setting:

 conn.setDoOutput(false);

The documentation says: "Optionally upload a request body. Instances must be configured with setDoOutput(true) if they include a request body." HttpURLConnection

Since you do not have anything in your body, might as well set it to false.

score 0 · Answer 3 · edited May 23 '17 at 11:51

0

The documentation Android has for setRequestMethod is minimal, however your error states that POST is not a valid method. Try using PUT instead:

conn.setRequestMethod("PUT");

Also see this post for any tweaks you may need to make.

edited May 23 '17 at 11:51

Community

1
1

answered Oct 29 '12 at 20:00

Phil

35,852
23
123
164

POSTing JSON and retrieving a response in Android

3 Answers3