Read JSON data with python cgi

Question

For some reason I find how to read json data in my cgi script.

I'm sending the json through an android application like this:

    DefaultHttpClient httpClient = new DefaultHttpClient();
    ResponseHandler<String> resonseHandler = new BasicResponseHandler();
    HttpPost postMethod = new HttpPost(serverUrl + "/cgi-bin/save.py");

    JSONObject json = new JSONObject();
    try {
        SimpleDateFormat sdf = new SimpleDateFormat("mm:ss");
        String time = sdf.format(camera.getRecordTime().getTime());

        json.put("md", camera.isMdOn());
        json.put("threshold", camera.getThreshold());
        json.put("recordTime", time);

        postMethod.setHeader("Content-Type", "application/json");
        postMethod.setEntity(new ByteArrayEntity(json.toString().getBytes("UTF8")));
        String response = httpClient.execute(postMethod, resonseHandler);

        Log.e("response :", response);
    } catch (JSONException e) {
        e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

and my script is:

#!C:\Python27\python.exe

import cgi, sys, json

#data = cgi.FieldStorage()
#data = sys.stdin.read()


print "Content-type: application/json"
print 
response={'result': data['md']}
print(json.JSONEncoder().encode(response))

as you can see I tried several methods (cgi.FieldStorage(), sys.stdin.read()) but nothing works, I'm getting a 500 error. I'm able to send data back from the script but not to read data sent to the script.

I know I can use a framework but I don't want to, so please don't refer me to any of those.