android - HttpsUrlConnection EOFException

Question

投稿リクエストに次のコードを使用しています

public String executeHttpPost(String uri, String data) {

    HttpURLConnection conn = null;
    URL url = null;
    String s = null;

    try {

        url = new URL(uri);

         conn = (HttpURLConnection) url.openConnection();

        if (conn instanceof HttpsURLConnection) {
            Log.d("HTTPS", "HttpsUrl");
        }

        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

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

        DisplayResponseHeaders(conn);

        s = readStream(conn.getInputStream());
        Log.d("body", s);

    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        s = null;
        e.printStackTrace();
    } finally {
        conn.disconnect();
    }
    return s;
  }

http 経由で使用すると、すべて正常に動作しますが、https 経由で取得します

 java.io.EOFException
 at libcore.io.Streams.readAsciiLine(Streams.java:203)
 at libcore.net.http.HttpEngine.readResponseHeaders(HttpEngine.java:573)
 at libcore.net.http.HttpEngine.readResponse(HttpEngine.java:821)
 at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:283)
 libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:177)
 libcore.net.http.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:271)
 ru.fors.remsmed.fragment.NetHelper.executeHttpPost(NetHelper.java:234)
 ru.fors.remsmed.LoginActivity$UserLoginTask.doInBackground(LoginActivity.java:424)
 ru.fors.remsmed.LoginActivity$UserLoginTask.doInBackground(LoginActivity.java:1)
 android.os.AsyncTask$2.call(AsyncTask.java:287)
 java.util.concurrent.FutureTask.run(FutureTask.java:234)
 android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
 java.lang.Thread.run(Thread.java:856)
 threadid=14: thread exiting with uncaught exception (group=0x40a71930)

httpsurlconnection で接続バグのリサイクルに関する問題と考えられる解決策を見つけました。

if (Build.VERSION.SDK != null && Build.VERSION.SDK_INT > 13) {
   conn.setRequestProperty("Connection", "close");
}

しかし、それは私にはうまくいきません。