001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.juneau.http;
018
019/**
020 * An HTTP header field: a name/value pair that appears in request or response messages.
021 *
022 * <h5 class='section'>See Also:</h5><ul>
023 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/NextGenRestClient">Next-Generation REST Client</a>
024 * </ul>
025 *
026 * @since 9.2.1
027 */
028public interface HttpHeader {
029
030   /**
031    * Returns the header name.
032    *
033    * @return The header name. Never <jk>null</jk>.
034    */
035   String getName();
036
037   /**
038    * Returns the header value, or <jk>null</jk> if the header has no value.
039    *
040    * @return The header value, possibly <jk>null</jk>.
041    */
042   String getValue();
043}