Java SSL HttpsServer with HttpHandler to send response to client (uses com.sun.net.httpserver.HttpsServer)

MyHttpsServer.java

import java.io.*;
import java.net.InetSocketAddress;
import com.sun.net.httpserver.HttpsServer;
import java.security.KeyStore;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.TrustManagerFactory;
import com.sun.net.httpserver.*;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLParameters;

import javax.net.ssl.SSLContext;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;

public class MyHttpsServer {

    public static class MyHandler implements HttpHandler {

        @Override
        public void handle(HttpExchange t) throws IOException {
            String response = "This is the response";
            t.getResponseHeaders().add("Access-Control-Allow-Origin", "*");
            t.sendResponseHeaders(200, response.getBytes().length);
            try (OutputStream os = t.getResponseBody()) {
                os.write(response.getBytes());
            }
        }
    }

    public static void main(String[] args) throws Exception {

        try {
            // setup the socket address
            InetSocketAddress address = new InetSocketAddress(443);

            // initialise the HTTPS server
            HttpsServer httpsServer = HttpsServer.create(address, 0);
            SSLContext sslContext = SSLContext.getInstance("TLS");

            // The keystore is generated using the following three files:
            //    - private_key.key
            //    - site.crt
            //    - site.ca-bundle
            // ...and using the following set of commands (and password as "password"):
            //    openssl pkcs12 -export -out keystore.pkcs12 -inkey private_key.key -certfile site.ca-bundle -in site.crt
            //    keytool -v -importkeystore -srckeystore keystore.pkcs12 -srcstoretype PKCS12 -destkeystore keystore.jks -deststoretype pkcs12

            // initialise the keystore
            char[] password = "password".toCharArray();
            KeyStore ks = KeyStore.getInstance("PKCS12");
            FileInputStream fis = new FileInputStream("/ssl/keystore.jks");
            ks.load(fis, password);

            // setup the key manager factory
            KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
            kmf.init(ks, password);

            // setup the trust manager factory
            TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509");
            tmf.init(ks);

            // setup the HTTPS context and parameters
            sslContext.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);
            httpsServer.setHttpsConfigurator(new HttpsConfigurator(sslContext) {
                @Override
                public void configure(HttpsParameters params) {
                    try {
                        // initialise the SSL context
                        SSLContext c = getSSLContext();
                        SSLEngine engine = c.createSSLEngine();
                        params.setNeedClientAuth(false);
                        params.setCipherSuites(engine.getEnabledCipherSuites());
                        params.setProtocols(engine.getEnabledProtocols());

                        // Set the SSL parameters
                        SSLParameters sslParameters = c.getSupportedSSLParameters();
                        params.setSSLParameters(sslParameters);

                    } catch (Exception ex) {
                        System.out.println("Failed to create HTTPS port");
                        System.out.println(ex.getMessage());
                    }
                }
            });
            httpsServer.createContext("/", new MyHandler());
            httpsServer.setExecutor(null); // creates a default executor
            httpsServer.start();

        } catch (IOException | KeyManagementException | KeyStoreException | NoSuchAlgorithmException | UnrecoverableKeyException | CertificateException ex) {
            System.out.println("Failed to create HTTPS server on port 443");
            System.out.println(ex.getMessage());
        }
    }
}