netty5/src/main/java/io/netty/example/http/snoop/HttpClient.java

/*
 * Copyright 2009 Red Hat, Inc.
 *
 * Red Hat licenses this file to you under the Apache License, version 2.0
 * (the "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at:
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.example.http.snoop;

import java.net.InetSocketAddress;
import java.net.URI;
import java.util.concurrent.Executors;

import io.netty.bootstrap.ClientBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.socket.nio.NioClientSocketChannelFactory;
import io.netty.handler.codec.http.CookieEncoder;
import io.netty.handler.codec.http.DefaultHttpRequest;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpVersion;

/**
 * A simple HTTP client that prints out the content of the HTTP response to
 * {@link System#out} to test {@link HttpServer}.
 */
public class HttpClient {

    public static void main(String[] args) throws Exception {
        if (args.length != 1) {
            System.err.println(
                    "Usage: " + HttpClient.class.getSimpleName() +
                    " <URL>");
            return;
        }

        URI uri = new URI(args[0]);
        String scheme = uri.getScheme() == null? "http" : uri.getScheme();
        String host = uri.getHost() == null? "localhost" : uri.getHost();
        int port = uri.getPort();
        if (port == -1) {
            if (scheme.equalsIgnoreCase("http")) {
                port = 80;
            } else if (scheme.equalsIgnoreCase("https")) {
                port = 443;
            }
        }

        if (!scheme.equalsIgnoreCase("http") && !scheme.equalsIgnoreCase("https")) {
            System.err.println("Only HTTP(S) is supported.");
            return;
        }

        boolean ssl = scheme.equalsIgnoreCase("https");

        // Configure the client.
        ClientBootstrap bootstrap = new ClientBootstrap(
                new NioClientSocketChannelFactory(
                        Executors.newCachedThreadPool(),
                        Executors.newCachedThreadPool()));

        // Set up the event pipeline factory.
        bootstrap.setPipelineFactory(new HttpClientPipelineFactory(ssl));

        // Start the connection attempt.
        ChannelFuture future = bootstrap.connect(new InetSocketAddress(host, port));

        // Wait until the connection attempt succeeds or fails.
        Channel channel = future.awaitUninterruptibly().getChannel();
        if (!future.isSuccess()) {
            future.getCause().printStackTrace();
            bootstrap.releaseExternalResources();
            return;
        }

        // Prepare the HTTP request.
        HttpRequest request = new DefaultHttpRequest(
                HttpVersion.HTTP_1_1, HttpMethod.GET, uri.toASCIIString());
        request.setHeader(HttpHeaders.Names.HOST, host);
        request.setHeader(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.CLOSE);
        request.setHeader(HttpHeaders.Names.ACCEPT_ENCODING, HttpHeaders.Values.GZIP);

        // Set some example cookies.
        CookieEncoder httpCookieEncoder = new CookieEncoder(false);
        httpCookieEncoder.addCookie("my-cookie", "foo");
        httpCookieEncoder.addCookie("another-cookie", "bar");
        request.setHeader(HttpHeaders.Names.COOKIE, httpCookieEncoder.encode());

        // Send the HTTP request.
        channel.write(request);

        // Wait for the server to close the connection.
        channel.getCloseFuture().awaitUninterruptibly();

        // Shut down executor threads to exit.
        bootstrap.releaseExternalResources();
    }
}