CODEWITHSUNDEEP
androiddjangohttpresttastypie
Pratik Mandrekar
Pratik Mandrekar

Reputation: 9568

HTTP POST Data in HTTPUrlConnection not getting set?

I am creating a HTTPUrlConnection in android and preparing it for a post as shown below

urlConnection = (HttpURLConnection) url.openConnection();

urlConnection.setRequestProperty("content-type", "application/json");
byte [] encoded = Base64.encode((username+":"+password).getBytes("UTF-8"), Base64.DEFAULT); 
//Basic Authorization               
urlConnection.setRequestProperty("Authorization", "Basic "+ new String(encoded, "UTF-8"));
urlConnection.setDoInput(true);
urlConnection.setDoOutput(true);

//This gets implicitly set when DoOutput is True, but still let it be               
urlConnection.setRequestMethod("POST");

//Required for POST not to return 404 when used on with a host:port combination
//http://stackoverflow.com/questions/5379247/filenotfoundexception-while-getting-the-inputstream-object-from-httpurlconnectio
urlConnection.setRequestProperty("User-Agent","Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20100101 Firefox/17.0");
urlConnection.setRequestProperty("Accept","*/*");

Then I prepare the JSON and write it to the OutputStream of the connection

JSONObject jsonObject = new JSONObject();
jsonObject.put("key1", "value1");
jsonObject.put("key2", "value2");



outputStreamWriter = urlConnection.getOutputStream ();
outputStreamWriter.write(jsonObject.toString().getBytes());


finally {
    if (outputStreamWriter != null) try { outputStreamWriter.close(); } catch (IOException logOrIgnore) {}
            }

When I do the request, I get a status of 500 because my server receives an empty POST data which is invalid json.

The same works from a web browser and curl. GET works on android with same parameters. What am I missing? Is something wrong with the ordering of the way parameters should be set for the POST request?

Upvotes: 2

Views: 3470

Answers (1)

Pratik Mandrekar
Pratik Mandrekar

Reputation: 9568

I was able to get this to work. Snippets from code below

Creating the data to be sent, note the escaped quotes that are required

List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(3);

nameValuePairs.add(new BasicNameValuePair("\A\"", "\"/api/v1/a/1/\""));

nameValuePairs.add(new BasicNameValuePair("\"B\"", "\"/api/v1/b/1/\""));

nameValuePairs.add(new BasicNameValuePair("\"C\"", "\"Hello from Android\""));

Create the client and set headers

HttpClient httpclient = new DefaultHttpClient();

HttpPost httppost = new HttpPost(urlToPost);

httppost.setHeader("content-type", "application/json");

Setting the Authorization header

String encoded = "Basic " + Base64.encodeToString((username+":"+password).getBytes("UTF-8"), Base64.URL_SAFE|Base64.NO_WRAP);

httppost.setHeader("Authorization",encoded);

String the data and set it as HTTP Parameters in the POST request

StringEntity entity = new StringEntity(getQueryJSON(nameValuePairs));

httppost.setEntity(entity);

HttpResponse response = httpclient.execute(httppost);

if(response!=null){

InputStream in = response.getEntity().getContent(); //Get the data in the entity

readStream(in);

}

Utility function to encode the JSON to string private String getQueryJSON(List params) throws UnsupportedEncodingException

{

    StringBuilder result = new StringBuilder();

    boolean first = true;

    for (NameValuePair pair : params)

    {

    if (first){

        first = false;

        result.append("{");

    }else

        result.append(",");


    result.append(pair.getName());

    result.append(":");

    result.append(pair.getValue());


    }

    result.append("}");

    return result.toString();

}

Upvotes: 1

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