/*

 * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/**

 * @test

 * @bug 8087112

 * @modules java.net.http

 *          jdk.httpserver

 * @run main/othervm ImmutableHeaders

 * @summary ImmutableHeaders

 */

import com.sun.net.httpserver.HttpExchange;

import com.sun.net.httpserver.HttpHandler;

import com.sun.net.httpserver.HttpServer;

import com.sun.net.httpserver.Headers;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.InetAddress;

import java.net.InetSocketAddress;

import java.net.URI;

import java.net.http.HttpClient;

import java.net.http.HttpHeaders;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.net.http.HttpResponse.BodyHandlers;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.List;

import static java.nio.charset.StandardCharsets.US_ASCII;

public class ImmutableHeaders {

    final static String RESPONSE = "Hello world";

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

        InetSocketAddress addr = new InetSocketAddress(InetAddress.getLoopbackAddress(), 0);

        HttpServer server = HttpServer.create(addr, 10);

        ExecutorService serverExecutor = Executors.newCachedThreadPool();

        ExecutorService clientExecutor = Executors.newCachedThreadPool();

        server.createContext("/test", new ImmutableHeadersHandler());

        int port = server.getAddress().getPort();

        System.out.println("Server port = " + port);

        server.setExecutor(serverExecutor);

        server.start();

        HttpClient client = HttpClient.newBuilder()

                                      .executor(clientExecutor)

                                      .build();

        try {

            URI uri = new URI("http://localhost:" + port + "/test/foo");

            HttpRequest req = HttpRequest.newBuilder(uri)

                                         .headers("X-Foo", "bar")

                                         .headers("X-Bar", "foo")

                                         .GET()

                                         .build();

            try {

                HttpHeaders hd = req.headers();

                List<String> v = hd.allValues("X-Foo");

                if (!v.get(0).equals("bar"))

                    throw new RuntimeException("Test failed");

                v.add("XX");

                throw new RuntimeException("Test failed");

            } catch (UnsupportedOperationException ex) {

            }

            HttpResponse resp = client.send(req, BodyHandlers.discarding());

            try {

                HttpHeaders hd = resp.headers();

                List<String> v = hd.allValues("X-Foo-Response");

                if (!v.get(0).equals("resp"))

                    throw new RuntimeException("Test failed");

                v.add("XX");

                throw new RuntimeException("Test failed");

            } catch (UnsupportedOperationException ex) {

            }

        } finally {

            clientExecutor.shutdownNow();

            serverExecutor.shutdownNow();

            server.stop(0);

        }

        System.out.println("OK");

    }

   static class ImmutableHeadersHandler implements HttpHandler {

        @Override

        public void handle(HttpExchange he) throws IOException {

            String method = he.getRequestMethod();

            InputStream is = he.getRequestBody();

            Headers h = he.getResponseHeaders();

            h.add("X-Foo-Response", "resp");

            he.sendResponseHeaders(200, RESPONSE.length());

            OutputStream os = he.getResponseBody();

            os.write(RESPONSE.getBytes(US_ASCII));

            os.close();

        }

   }

}