e4995be33c
Motivation: In many places Netty uses Unpooled.buffer(0) while should use EMPTY_BUFFER. We can't change this due to back compatibility in the constructors but can use Unpooled.EMPTY_BUFFER in some cases to ensure we not allocate at all. In others we can directly use the allocator either from the Channel / ChannelHandlerContext or the request / response. Modification: - Use Unpooled.EMPTY_BUFFER where possible - Use allocator where possible Result: Fixes #9345 for websockets and http package
75 lines
3.0 KiB
Java
75 lines
3.0 KiB
Java
/*
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* Copyright 2015 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a 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
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.example.http2.tiles;
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import static io.netty.buffer.Unpooled.EMPTY_BUFFER;
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import static io.netty.buffer.Unpooled.copiedBuffer;
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import static io.netty.buffer.Unpooled.unreleasableBuffer;
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import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_LENGTH;
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import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_TYPE;
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import static io.netty.handler.codec.http.HttpResponseStatus.CONTINUE;
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import static io.netty.handler.codec.http.HttpResponseStatus.OK;
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import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
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import static io.netty.util.CharsetUtil.UTF_8;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.handler.codec.http.DefaultFullHttpResponse;
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import io.netty.handler.codec.http.FullHttpResponse;
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import io.netty.handler.codec.http.HttpUtil;
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import io.netty.handler.codec.http.HttpRequest;
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import io.netty.handler.codec.http2.Http2CodecUtil;
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/**
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* Handles the exceptional case where HTTP 1.x was negotiated under TLS.
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*/
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public final class FallbackRequestHandler extends SimpleChannelInboundHandler<HttpRequest> {
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private static final ByteBuf response = unreleasableBuffer(copiedBuffer("<!DOCTYPE html>"
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+ "<html><body><h2>To view the example you need a browser that supports HTTP/2 ("
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+ Http2CodecUtil.TLS_UPGRADE_PROTOCOL_NAME
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+ ")</h2></body></html>", UTF_8)).asReadOnly();
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@Override
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protected void channelRead0(ChannelHandlerContext ctx, HttpRequest req) throws Exception {
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if (HttpUtil.is100ContinueExpected(req)) {
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ctx.write(new DefaultFullHttpResponse(HTTP_1_1, CONTINUE, EMPTY_BUFFER));
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}
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ByteBuf content = ctx.alloc().buffer();
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content.writeBytes(response.duplicate());
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FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK, content);
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response.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8");
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response.headers().setInt(CONTENT_LENGTH, response.content().readableBytes());
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ctx.write(response).addListener(ChannelFutureListener.CLOSE);
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}
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@Override
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public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
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ctx.flush();
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
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cause.printStackTrace();
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ctx.close();
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}
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}
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