Bonjour, j'ai un programme Java qui appelle un web service qui me sort une erreur java.net.SocketException: Connection reset, et je n'arrive pas à trouver une solution

Voici mon programme

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            try {
                String currentLocation = System.getProperty("user.dir");
                URL url = new URL("http://ip:8080/api/methodName");
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setDoOutput(true);
                conn.setRequestMethod("POST");
                conn.setRequestProperty("Accept", "application/json");
                try (OutputStream os = conn.getOutputStream();) {
                    OutputStreamWriter osw = new OutputStreamWriter(os, "UTF-8");
                    osw.write(currentLocation);
                    osw.flush();
                    osw.close();
                    os.close();  //don't forget to close the OutputStream

                    if (conn.getResponseCode() != 200) {  // the ERROR happens at this line
                        throw new RuntimeException("Failed : HTTP error code : "
                                + conn.getResponseCode());
                    }

                    BufferedReader br = new BufferedReader(new InputStreamReader(
                            (conn.getInputStream())));
                    String output;
                    System.out.println("Output from Server .... \n");
                    while ((output = br.readLine()) != null) {
                        System.out.println(output);
                    }

                    conn.disconnect();
                }
            } catch (MalformedURLException e) {

                e.printStackTrace();

            } catch (IOException e) {

                e.printStackTrace();

            }
voici le message d'erreur entier

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java.net.SocketException: Connection reset
        at java.net.SocketInputStream.read(Unknown Source)
        at java.net.SocketInputStream.read(Unknown Source)
        at java.io.BufferedInputStream.fill(Unknown Source)
        at java.io.BufferedInputStream.read1(Unknown Source)
        at java.io.BufferedInputStream.read(Unknown Source)
        at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
        at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
        at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
        at java.net.HttpURLConnection.getResponseCode(Unknown Source)
        at LaunchApp.main(LaunchApp.java:43)
Pouvez vous m'aider ?