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* </tr> * <tr> * <td>{@code maxInitialLineLength} * <td>The maximum length of the initial line (e.g. {@code "HTTP/1.0 200 OK"}) * If the length of the initial line exceeds this value, a * {@link TooLongFrameException} will be raised.</td> * </tr> * <tr> * <td>{@code maxHeaderSize} * <td>The maximum length of all headers. If the sum of the length of each * header exceeds this value, a {@link TooLongFrameException} will be raised.</td> * </tr> * <tr> * <td>{@code maxChunkSize} * <td>The maximum length of the content or each chunk. If the content length * exceeds this value, the transfer encoding of the decoded response will be * converted to 'chunked' and the content will be split into multiple * {@link HttpContent}s. If the transfer encoding of the HTTP response is * 'chunked' already, each chunk will be split into smaller chunks if the * length of the chunk exceeds this value. If you prefer not to handle * {@link HttpContent}s in your handler, insert {@link HttpObjectAggregator} * after this decoder in the {@link ChannelPipeline}.</td> * </tr> * </table> * * <h3>Decoding a response for a HEAD request * <p> * Unlike other HTTP requests, the successful response of a <tt>HEAD * request does not have any content even if there is <tt>Content-Length * header. Because {@link HttpResponseDecoder} is not able to determine if the * response currently being decoded is associated with a <tt>HEAD request, * you must override {@link #isContentAlwaysEmpty(HttpMessage)} to return * <tt>true for the response of the HEAD request. * </p>

* If you are writing an HTTP client that issues a <tt>HEAD request, * please use {@link HttpClientCodec} instead of this decoder. It will perform * additional state management to handle the responses for <tt>HEAD * requests correctly. * </p> * * <h3>Decoding a response for a CONNECT request * <p> * You also need to do additional state management to handle the response of a * <tt>CONNECT request properly, like you did for HEAD. One * difference is that the decoder should stop decoding completely after decoding * the successful 200 response since the connection is not an HTTP connection * anymore. * </p>

* {@link HttpClientCodec} also handles this edge case correctly, so you have to * use {@link HttpClientCodec} if you are writing an HTTP client that issues a * <tt>CONNECT request. * </p> */ public class HttpResponseDecoder extends HttpObjectDecoder { private static final HttpResponseStatus UNKNOWN_STATUS = new HttpResponseStatus(999, "Unknown"); /** * Creates a new instance with the default * {@code maxInitialLineLength (4096)}, {@code maxHeaderSize (8192)}, and * {@code maxChunkSize (8192)}. */ public HttpResponseDecoder() { } /** * Creates a new instance with the specified parameters. */ public HttpResponseDecoder( int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) { super(maxInitialLineLength, maxHeaderSize, maxChunkSize, true); } public HttpResponseDecoder( int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean validateHeaders) { super(maxInitialLineLength, maxHeaderSize, maxChunkSize, true, validateHeaders); } public HttpResponseDecoder( int maxInitialLineLength, int maxHeaderSize, int maxChunkSize, boolean validateHeaders, int initialBufferSize) { super(maxInitialLineLength, maxHeaderSize, maxChunkSize, true, validateHeaders, initialBufferSize); } @Override protected HttpMessage createMessage(String[] initialLine) { return new DefaultHttpResponse( HttpVersion.valueOf(initialLine[0]), new HttpResponseStatus(Integer.parseInt(initialLine[1]), initialLine[2]), validateHeaders); } @Override protected HttpMessage createInvalidMessage() { return new DefaultFullHttpResponse(HttpVersion.HTTP_1_0, UNKNOWN_STATUS, validateHeaders); } @Override protected boolean isDecodingRequest() { return false; } }

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Java example source code file (HttpResponseDecoder.java)

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Java - Java tags/keywords

defaulthttpresponse, httpmessage, httpobjectdecoder, httpresponsedecoder, httpresponsestatus, override, unknown_status

The HttpResponseDecoder.java Java example source code

/*
 * Copyright 2012 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 io.netty.handler.codec.http;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.TooLongFrameException;


/**
 * Decodes {@link ByteBuf}s into {@link HttpResponse}s and
 * {@link HttpContent}s.
 *
 * <h3>Parameters that prevents excessive memory consumption
 * <table border="1">
 * <tr>
 * <th>Name
Meaning
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