HttpHeaders.java — netty Source File

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:
 *
 *   https://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.buffer.ByteBufUtil;
import io.netty.handler.codec.DateFormatter;
import io.netty.handler.codec.Headers;
import io.netty.handler.codec.HeadersUtils;
import io.netty.util.AsciiString;
import io.netty.util.CharsetUtil;
import io.netty.util.internal.ObjectUtil;

import java.text.ParseException;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import static io.netty.util.AsciiString.contentEquals;
import static io.netty.util.AsciiString.contentEqualsIgnoreCase;
import static io.netty.util.AsciiString.trim;
import static io.netty.util.internal.ObjectUtil.checkNotNull;

/**
 * Provides the constants for the standard HTTP header names and values and
 * commonly used utility methods that accesses an {@link HttpMessage}.
 * <p>
 * Concrete instances of this class are most easily obtained from its default factory:
 * {@link DefaultHttpHeadersFactory#headersFactory()}.
 */
public abstract class HttpHeaders implements Iterable<Map.Entry<String, String>> {
    /**
     * @deprecated Use {@link EmptyHttpHeaders#INSTANCE}.
     * <p>
     * The instance is instantiated here to break the cyclic static initialization between {@link EmptyHttpHeaders} and
     * {@link HttpHeaders}. The issue is that if someone accesses {@link EmptyHttpHeaders#INSTANCE} before
     * {@link HttpHeaders#EMPTY_HEADERS} then {@link HttpHeaders#EMPTY_HEADERS} will be {@code null}.
     */
    @Deprecated
    public static final HttpHeaders EMPTY_HEADERS = EmptyHttpHeaders.instance();

    /**
     * @deprecated Use {@link HttpHeaderNames} instead.
// ... (1646 more lines)