Send Gupshup SMS using Java API

import javax.net.ssl.HttpsURLConnection;

public void sendSms() {
try {
    String data = "";
    data += "method=sendMessage";
    data += "&userid=<userid>"; // your loginId
    data += "&password=" + URLEncoder.encode("<password>", StandardCharsets.UTF_8); // your password
    data += "&msg=" + URLEncoder.encode("SMS text", StandardCharsets.UTF_8);
    data += "&send_to=" + URLEncoder.encode("<mobile number>", StandardCharsets.UTF_8); // a valid 10 digit phone no.
    data += "&v=1.1";
    data += "&msg_type=TEXT"; // Can by "FLASH" or "UNICODE_TEXT" or “BINARY”
    data += "&auth_scheme=PLAIN";
    URL url = new URL("https://enterprise.smsgupshup.com/GatewayAPI/rest?" + data);
    HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
    conn.setRequestMethod("GET");
    conn.setDoOutput(true);
    conn.setDoInput(true);
    conn.setUseCaches(false);
    conn.connect();
    BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    String line;
    StringBuffer buffer = new StringBuffer();
    while ((line = rd.readLine()) != null) {
        buffer.append(line).append("\n");
    }
    System.out.println(buffer.toString());
    rd.close();
    conn.disconnect();
} catch (Exception e) {
    e.printStackTrace();
}
}

private void sendSms() throws IOException, InterruptedException {
    HttpClient httpClient = HttpClient.newBuilder()
            .connectTimeout(Duration.ofSeconds(10))
            .build();

    String data = "";
    data += "method=sendMessage";
    data += "&userid=<userid>"; // your loginId
    data += "&password=" + URLEncoder.encode("<password>", StandardCharsets.UTF_8); // your password
    data += "&msg=" + URLEncoder.encode("<SMS Text>", StandardCharsets.UTF_8);
    data += "&send_to=" + URLEncoder.encode("<Mobile Number>", StandardCharsets.UTF_8); // a valid 10 digit phone no.
    data += "&v=1.1";
    data += "&msg_type=TEXT"; // Can by "FLASH" or "UNICODE_TEXT" or “BINARY”
    data += "&auth_scheme=PLAIN";
//        URL url = new URL("http://enterprise.smsgupshup.com/GatewayAPI/rest?" + data);

    var request = HttpRequest.newBuilder()
            .GET()
            .uri(URI.create("https://enterprise.smsgupshup.com/GatewayAPI/rest?" + data))
            .build();

    final HttpResponse<String> httpResponse = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
    System.out.println(httpResponse.body());
}

private void sendSms() {
    try {
        RestTemplate restTemplate = new RestTemplate();
        final ResponseEntity<String> responseEntity = restTemplate.exchange("https://enterprise.smsgupshup.com/GatewayAPI/rest?method=sendMessage&userid={userid}&password={password}&msg={msg}&send_to={send_to}&v={version}&msg_type={msg_type}&auth_scheme={auth_scheme}",
                HttpMethod.GET, HttpEntity.EMPTY, String.class,
                "<userid>", "<password>", "<SMS text>", "<mobile number>", "1.1", "TEXT", "PLAIN");
        final String body = responseEntity.getBody();
        System.out.println("response = " + body);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

OkHttpClient okHttpClient = new OkHttpClient.Builder()
        .readTimeout(60, TimeUnit.SECONDS)
        .writeTimeout(60, TimeUnit.SECONDS)
        .addInterceptor(new HttpLoggingInterceptor())
        .build();

public String sendSms() throws IOException {
    HttpUrl.Builder urlBuilder = HttpUrl.parse("https://enterprise.smsgupshup.com/GatewayAPI/rest").newBuilder();
    urlBuilder.addQueryParameter("method", "sendMessage");
    urlBuilder.addQueryParameter("userid", "<username>");
    urlBuilder.addQueryParameter("password", "<password>");
    urlBuilder.addQueryParameter("msg", "SMS Text");
    urlBuilder.addQueryParameter("send_to", "Mobile number");
    urlBuilder.addQueryParameter("v", "1.1");
    urlBuilder.addQueryParameter("msg_type", "TEXT");
    urlBuilder.addQueryParameter("auth_scheme", "PLAIN");
    String url = urlBuilder.build().toString();
    Request request = new Request.Builder().url(url).build();
    logger.info("SmsGateway Sending SMS to user {}", payload);
    try (Response response = okHttpClient.newCall(request).execute()) {
        if (!response.isSuccessful()) {
            logger.error("Error sending sms: {}", response.toString());
            throw new IOException("Unexpected sms gateway code " + response.toString());
        }
        final String responseString = response.body().string();
        logger.info("SMS gateway response {}", responseString);
        return responseString;
    }
}