Java tutorial
/* * Copyright 2015 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 com.flysoloing.learning.network.netty.http2.tiles; import io.netty.buffer.ByteBuf; import io.netty.channel.ChannelFutureListener; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; import io.netty.handler.codec.http.DefaultFullHttpResponse; import io.netty.handler.codec.http.FullHttpResponse; import io.netty.handler.codec.http.HttpRequest; import io.netty.handler.codec.http.HttpUtil; import io.netty.handler.codec.http2.Http2CodecUtil; import static io.netty.buffer.Unpooled.copiedBuffer; import static io.netty.buffer.Unpooled.unreleasableBuffer; import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_LENGTH; import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_TYPE; import static io.netty.handler.codec.http.HttpResponseStatus.CONTINUE; import static io.netty.handler.codec.http.HttpResponseStatus.OK; import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1; import static io.netty.util.CharsetUtil.UTF_8; /** * Handles the exceptional case where HTTP 1.x was negotiated under TLS. */ public final class FallbackRequestHandler extends SimpleChannelInboundHandler<HttpRequest> { private static final ByteBuf response = unreleasableBuffer(copiedBuffer( "<!DOCTYPE html>" + "<html><body><h2>To view the example you need a browser that supports HTTP/2 (" + Http2CodecUtil.TLS_UPGRADE_PROTOCOL_NAME + ")</h2></body></html>", UTF_8)).asReadOnly(); @Override protected void channelRead0(ChannelHandlerContext ctx, HttpRequest req) throws Exception { if (HttpUtil.is100ContinueExpected(req)) { ctx.write(new DefaultFullHttpResponse(HTTP_1_1, CONTINUE)); } ByteBuf content = ctx.alloc().buffer(); content.writeBytes(response.duplicate()); FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK, content); response.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8"); response.headers().setInt(CONTENT_LENGTH, response.content().readableBytes()); ctx.write(response).addListener(ChannelFutureListener.CLOSE); } @Override public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { ctx.flush(); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) { cause.printStackTrace(); ctx.close(); } }