/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
*
Header name comparison is case insensitive.
*
* @param name the name of the header to get
* @return the first header or {@code null}
* @throws ProtocolException in case multiple headers with the given name are found.
*/
Header getSingleHeader(String name) throws ProtocolException;
/**
* Returns the first header with a specified name of this message. Header
* values are ignored. If there is more than one matching header in the
* message the first element of {@link #getHeaders(String)} is returned.
* If there is no matching header in the message {@code null} is
* returned.
*
* @param name the name of the header to return.
* @return the first header whose name property equals {@code name}
* or {@code null} if no such header could be found.
*/
Header getFirstHeader(String name);
/**
* Returns the last header with a specified name of this message. Header values
* are ignored. If there is more than one matching header in the message the
* last element of {@link #getHeaders(String)} is returned. If there is no
* matching header in the message {@code null} is returned.
*
* @param name the name of the header to return.
* @return the last header whose name property equals {@code name}.
* or {@code null} if no such header could be found.
*/
Header getLastHeader(String name);
/**
* Returns all the headers of this message. Headers are orderd in the sequence
* they will be sent over a connection.
*
* @return all the headers of this message
*/
Header[] getAllHeaders();
/**
* Returns an iterator of all the headers.
*
* @return Iterator that returns Header objects in the sequence they are
* sent over a connection.
*/
Iterator