Motivation: Adding an example that showcases Netty’s HTTP/2 codec and that is slightly more complex than the existing hello-world example. It is based on the Gopher tiles example available here: https://http2.golang.org/gophertiles?latency=0 Modifications: Moved current http2 example to http2/helloworld. Added http2 tiles example under http2/tiles. Result: A Netty tiles example is available.
141 lines
6.7 KiB
Java
141 lines
6.7 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License, version 2.0 (the
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* "License"); you may not use this file except in compliance with the License. You may obtain a
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* copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package io.netty.example.http2.helloworld.client;
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import io.netty.bootstrap.Bootstrap;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelOption;
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import io.netty.channel.EventLoopGroup;
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import io.netty.channel.nio.NioEventLoopGroup;
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import io.netty.channel.socket.nio.NioSocketChannel;
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import io.netty.handler.codec.http.DefaultFullHttpRequest;
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import io.netty.handler.codec.http.FullHttpRequest;
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import io.netty.handler.codec.http.HttpHeaderNames;
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import io.netty.handler.codec.http.HttpHeaderValues;
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import io.netty.handler.codec.http2.Http2OrHttpChooser.SelectedProtocol;
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import io.netty.handler.codec.http2.Http2SecurityUtil;
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import io.netty.handler.ssl.ApplicationProtocolConfig;
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import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol;
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import io.netty.handler.ssl.ApplicationProtocolConfig.SelectedListenerFailureBehavior;
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import io.netty.handler.ssl.ApplicationProtocolConfig.SelectorFailureBehavior;
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import io.netty.handler.ssl.OpenSsl;
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import io.netty.handler.ssl.SslContext;
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import io.netty.handler.ssl.SslContextBuilder;
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import io.netty.handler.ssl.SslProvider;
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import io.netty.handler.ssl.SupportedCipherSuiteFilter;
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import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
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import io.netty.util.CharsetUtil;
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import java.net.URI;
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import java.util.concurrent.TimeUnit;
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import static io.netty.handler.codec.http.HttpMethod.*;
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import static io.netty.handler.codec.http.HttpVersion.*;
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/**
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* An HTTP2 client that allows you to send HTTP2 frames to a server. Inbound and outbound frames are
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* logged. When run from the command-line, sends a single HEADERS frame to the server and gets back
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* a "Hello World" response.
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*/
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public final class Http2Client {
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static final boolean SSL = System.getProperty("ssl") != null;
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static final String HOST = System.getProperty("host", "127.0.0.1");
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static final int PORT = Integer.parseInt(System.getProperty("port", SSL? "8443" : "8080"));
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static final String URL = System.getProperty("url", "/whatever");
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static final String URL2 = System.getProperty("url2");
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static final String URL2DATA = System.getProperty("url2data", "test data!");
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public static void main(String[] args) throws Exception {
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// Configure SSL.
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final SslContext sslCtx;
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if (SSL) {
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SslProvider provider = OpenSsl.isAlpnSupported() ? SslProvider.OPENSSL : SslProvider.JDK;
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sslCtx = SslContextBuilder.forClient()
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.sslProvider(provider)
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/* NOTE: the cipher filter may not include all ciphers required by the HTTP/2 specification.
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* Please refer to the HTTP/2 specification for cipher requirements. */
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.ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
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.trustManager(InsecureTrustManagerFactory.INSTANCE)
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.applicationProtocolConfig(new ApplicationProtocolConfig(
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Protocol.ALPN,
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// NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers.
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SelectorFailureBehavior.NO_ADVERTISE,
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// ACCEPT is currently the only mode supported by both OpenSsl and JDK providers.
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SelectedListenerFailureBehavior.ACCEPT,
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SelectedProtocol.HTTP_2.protocolName(),
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SelectedProtocol.HTTP_1_1.protocolName()))
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.build();
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} else {
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sslCtx = null;
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}
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EventLoopGroup workerGroup = new NioEventLoopGroup();
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Http2ClientInitializer initializer = new Http2ClientInitializer(sslCtx, Integer.MAX_VALUE);
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try {
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// Configure the client.
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Bootstrap b = new Bootstrap();
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b.group(workerGroup);
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b.channel(NioSocketChannel.class);
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b.option(ChannelOption.SO_KEEPALIVE, true);
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b.remoteAddress(HOST, PORT);
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b.handler(initializer);
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// Start the client.
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Channel channel = b.connect().syncUninterruptibly().channel();
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System.out.println("Connected to [" + HOST + ':' + PORT + ']');
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// Wait for the HTTP/2 upgrade to occur.
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Http2SettingsHandler http2SettingsHandler = initializer.settingsHandler();
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http2SettingsHandler.awaitSettings(5, TimeUnit.SECONDS);
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HttpResponseHandler responseHandler = initializer.responseHandler();
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int streamId = 3;
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URI hostName = URI.create((SSL ? "https" : "http") + "://" + HOST + ':' + PORT);
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System.err.println("Sending request(s)...");
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if (URL != null) {
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// Create a simple GET request.
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FullHttpRequest request = new DefaultFullHttpRequest(HTTP_1_1, GET, URL);
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request.headers().addObject(HttpHeaderNames.HOST, hostName);
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request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.GZIP);
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request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.DEFLATE);
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channel.writeAndFlush(request);
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responseHandler.put(streamId, channel.newPromise());
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streamId += 2;
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}
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if (URL2 != null) {
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// Create a simple POST request with a body.
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FullHttpRequest request = new DefaultFullHttpRequest(HTTP_1_1, POST, URL2,
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Unpooled.copiedBuffer(URL2DATA.getBytes(CharsetUtil.UTF_8)));
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request.headers().addObject(HttpHeaderNames.HOST, hostName);
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request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.GZIP);
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request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.DEFLATE);
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channel.writeAndFlush(request);
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responseHandler.put(streamId, channel.newPromise());
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streamId += 2;
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}
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responseHandler.awaitResponses(5, TimeUnit.SECONDS);
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System.out.println("Finished HTTP/2 request(s)");
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// Wait until the connection is closed.
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channel.close().syncUninterruptibly();
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} finally {
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workerGroup.shutdownGracefully();
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}
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}
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}
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