Why http post on android fails over 3g?

Question

i have an android application that makes an HTTP post request to a server containing some NameValuePairs, and It works just fine over any wifi network, but when i use the same http post over 3g, the server gets a http request with an empty body. Here is the code for the request

            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(
                    3);
            nameValuePairs.add(new BasicNameValuePair("Name", params[0]));
            nameValuePairs.add(new BasicNameValuePair("DNI", params[1]));
            nameValuePairs.add(new BasicNameValuePair("Token", params[2]));

            URL url = new URL(URL_SERVER);
            HttpURLConnection conn = (HttpURLConnection) url
                    .openConnection();
            conn.setReadTimeout(30000);
            conn.setConnectTimeout(50000);
            conn.setRequestMethod("POST");
            conn.setDoInput(true);
            conn.setDoOutput(true);

            OutputStream os = conn.getOutputStream();
            BufferedWriter writer = new BufferedWriter(
                    new OutputStreamWriter(os, "UTF-8"));
            writer.write(getQuery(nameValuePairs));
            writer.flush();
            writer.close();
            os.close();

            conn.connect();
            int responseCode = conn.getResponseCode();
            BufferedReader in;
            if (responseCode == 404)
                in = new BufferedReader(new InputStreamReader(
                        conn.getErrorStream()));
            else
                in = new BufferedReader(new InputStreamReader(
                        conn.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();

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

Here is the code for the getQuery method

private String getQuery(List<NameValuePair> params)
        throws UnsupportedEncodingException {
    StringBuilder result = new StringBuilder();
    boolean first = true;

    for (NameValuePair pair : params) {
        if (first)
            first = false;
        else
            result.append("&");

        result.append(URLEncoder.encode(pair.getName(), "UTF-8"));
        result.append("=");
        result.append(URLEncoder.encode(pair.getValue(), "UTF-8"));
    }

    return result.toString();
}

Any idea why this happens?

I have new info. I made a form to send the http post over the web browser. that form works great and sends perfectly the body over 3g on Windows phone and over wifi. But when I try to use the chrome of the android phone over 3g to send the http post, it arrives empty, and also if I try to send the http post from one computer connected to a hotspot of my android phone it fails. When i try with the same computer connected to a wifi network, no problem at all. This is so weird. Ideas?

score 0 · Answer 1 · answered Oct 14 '14 at 19:58

My advice is to use Google's Volley library for networking. It is pretty much the best choice currently when it comes to networking on Android. It really should not be a 3G problem. If it is, you problem might be an isolated one.

Here you have some resources to look at(volley is really easy to use):

https://developers.google.com/events/io/sessions/325304728 https://developer.android.com/training/volley/index.html

score 0 · Accepted Answer · answered Oct 14 '14 at 22:50

0

Solved, the problem was that the server didn't read properly the requests that had multiple tcp datagrams, and looks like android split the tcp datagrams over 3g

answered Oct 14 '14 at 22:50

sir assistant

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1
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Why http post on android fails over 3g?

2 Answers2