001/*
002 * ====================================================================
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *   http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing,
014 * software distributed under the License is distributed on an
015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
016 * KIND, either express or implied.  See the License for the
017 * specific language governing permissions and limitations
018 * under the License.
019 * ====================================================================
020 *
021 * This software consists of voluntary contributions made by many
022 * individuals on behalf of the Apache Software Foundation.  For more
023 * information on the Apache Software Foundation, please see
024 * <http://www.apache.org/>.
025 *
026 */
027
028package org.apache.http.nio.protocol;
029
030import java.io.IOException;
031
032import org.apache.http.HttpException;
033import org.apache.http.protocol.HttpContext;
034
035/**
036 * {@code HttpAsyncExpectationVerifier} defines a strategy to verify whether
037 * or not an incoming HTTP request meets the target server's expectations.
038 *<p>
039 * A server that does not understand or is unable to comply with any of
040 * the expectation values in the Expect field of a request MUST respond
041 * with appropriate error status. The server MUST respond with a 417
042 * (Expectation Failed) status if any of the expectations cannot be met
043 * or, if there are other problems with the request, some other 4xx
044 * status.
045 *
046 * @since 4.2
047 */
048public interface HttpAsyncExpectationVerifier {
049
050    void verify(
051            HttpAsyncExchange httpExchange,
052            HttpContext context) throws HttpException, IOException;
053
054}