Java tutorial
/* * Copyright 2014 The Netty Project * * The Netty Project 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 netty5.http.client; import io.netty.bootstrap.Bootstrap; import io.netty.buffer.Unpooled; import io.netty.channel.Channel; import io.netty.channel.ChannelOption; import io.netty.channel.EventLoopGroup; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.nio.NioSocketChannel; import io.netty.handler.codec.http.DefaultFullHttpRequest; import io.netty.handler.codec.http.FullHttpRequest; import io.netty.handler.codec.http.HttpHeaderNames; import io.netty.handler.codec.http.HttpHeaderValues; import io.netty.handler.codec.http2.Http2SecurityUtil; import io.netty.handler.ssl.ApplicationProtocolConfig; import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol; import io.netty.handler.ssl.ApplicationProtocolConfig.SelectedListenerFailureBehavior; import io.netty.handler.ssl.ApplicationProtocolConfig.SelectorFailureBehavior; import io.netty.handler.ssl.ApplicationProtocolNames; import io.netty.handler.ssl.OpenSsl; import io.netty.handler.ssl.SslContext; import io.netty.handler.ssl.SslContextBuilder; import io.netty.handler.ssl.SslProvider; import io.netty.handler.ssl.SupportedCipherSuiteFilter; import io.netty.handler.ssl.util.InsecureTrustManagerFactory; import io.netty.util.CharsetUtil; import java.net.URI; import java.util.concurrent.TimeUnit; import static io.netty.handler.codec.http.HttpMethod.*; import static io.netty.handler.codec.http.HttpVersion.*; /** * An HTTP2 client that allows you to send HTTP2 frames to a server. Inbound and outbound frames are * logged. When run from the command-line, sends a single HEADERS frame to the server and gets back * a "Hello World" response. */ public final class Http2Client { static final boolean SSL = System.getProperty("ssl") != null; static final String HOST = System.getProperty("host", "127.0.0.1"); static final int PORT = Integer.parseInt(System.getProperty("port", SSL ? "8443" : "8080")); static final String URL = System.getProperty("url", "/whatever"); static final String URL2 = System.getProperty("url2"); static final String URL2DATA = System.getProperty("url2data", "test data!"); public static void main(String[] args) throws Exception { // Configure SSL. final SslContext sslCtx; if (SSL) { SslProvider provider = OpenSsl.isAlpnSupported() ? SslProvider.OPENSSL : SslProvider.JDK; sslCtx = SslContextBuilder.forClient().sslProvider(provider) /* NOTE: the cipher filter may not include all ciphers required by the HTTP/2 specification. * Please refer to the HTTP/2 specification for cipher requirements. */ .ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE) .trustManager(InsecureTrustManagerFactory.INSTANCE) .applicationProtocolConfig(new ApplicationProtocolConfig(Protocol.ALPN, // NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers. SelectorFailureBehavior.NO_ADVERTISE, // ACCEPT is currently the only mode supported by both OpenSsl and JDK providers. SelectedListenerFailureBehavior.ACCEPT, ApplicationProtocolNames.HTTP_2, ApplicationProtocolNames.HTTP_1_1)) .build(); } else { sslCtx = null; } EventLoopGroup workerGroup = new NioEventLoopGroup(); Http2ClientInitializer initializer = new Http2ClientInitializer(sslCtx, Integer.MAX_VALUE); try { // Configure the client. Bootstrap b = new Bootstrap(); b.group(workerGroup); b.channel(NioSocketChannel.class); b.option(ChannelOption.SO_KEEPALIVE, true); b.remoteAddress(HOST, PORT); b.handler(initializer); // Start the client. Channel channel = b.connect().syncUninterruptibly().channel(); System.out.println("Connected to [" + HOST + ':' + PORT + ']'); // Wait for the HTTP/2 upgrade to occur. Http2SettingsHandler http2SettingsHandler = initializer.settingsHandler(); http2SettingsHandler.awaitSettings(5, TimeUnit.SECONDS); HttpResponseHandler responseHandler = initializer.responseHandler(); int streamId = 3; URI hostName = URI.create((SSL ? "https" : "http") + "://" + HOST + ':' + PORT); System.err.println("Sending request(s)..."); if (URL != null) { // Create a simple GET request. FullHttpRequest request = new DefaultFullHttpRequest(HTTP_1_1, GET, URL); request.headers().addObject(HttpHeaderNames.HOST, hostName); request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.GZIP); request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.DEFLATE); channel.writeAndFlush(request); responseHandler.put(streamId, channel.newPromise()); streamId += 2; } if (URL2 != null) { // Create a simple POST request with a body. FullHttpRequest request = new DefaultFullHttpRequest(HTTP_1_1, POST, URL2, Unpooled.copiedBuffer(URL2DATA.getBytes(CharsetUtil.UTF_8))); request.headers().addObject(HttpHeaderNames.HOST, hostName); request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.GZIP); request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.DEFLATE); channel.writeAndFlush(request); responseHandler.put(streamId, channel.newPromise()); streamId += 2; } responseHandler.awaitResponses(5, TimeUnit.SECONDS); System.out.println("Finished HTTP/2 request(s)"); // Wait until the connection is closed. channel.close().syncUninterruptibly(); } finally { workerGroup.shutdownGracefully(); } } }