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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  
28  package org.apache.http.nio.protocol;
29  
30  import java.io.IOException;
31  
32  import org.apache.http.HttpException;
33  import org.apache.http.protocol.HttpContext;
34  
35  /**
36   * {@code HttpAsyncExpectationVerifier} defines a strategy to verify whether
37   * or not an incoming HTTP request meets the target server's expectations.
38   *<p>
39   * A server that does not understand or is unable to comply with any of
40   * the expectation values in the Expect field of a request MUST respond
41   * with appropriate error status. The server MUST respond with a 417
42   * (Expectation Failed) status if any of the expectations cannot be met
43   * or, if there are other problems with the request, some other 4xx
44   * status.
45   *
46   * @since 4.2
47   */
48  public interface HttpAsyncExpectationVerifier {
49  
50      void verify(
51              HttpAsyncExchange httpExchange,
52              HttpContext context) throws HttpException, IOException;
53  
54  }