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.hc.core5.http.protocol;
29
30 import java.io.IOException;
31
32 import org.apache.hc.core5.annotation.Contract;
33 import org.apache.hc.core5.annotation.ThreadingBehavior;
34 import org.apache.hc.core5.http.EntityDetails;
35 import org.apache.hc.core5.http.HttpException;
36 import org.apache.hc.core5.http.HttpResponse;
37 import org.apache.hc.core5.http.HttpResponseInterceptor;
38 import org.apache.hc.core5.http.HttpStatus;
39 import org.apache.hc.core5.http.ProtocolException;
40 import org.apache.hc.core5.util.Args;
41
42 /**
43 * This response interceptor is responsible for making the protocol conformance checks
44 * of outgoing response messages.
45 * <p>
46 * This interceptor is essential for the HTTP protocol conformance and
47 * the correct operation of the server-side message processing pipeline.
48 * </p>
49 *
50 * @since 5.3
51 */
52 @Contract(threading = ThreadingBehavior.IMMUTABLE)
53 public class ResponseConformance implements HttpResponseInterceptor {
54
55 public static final ResponseConformance INSTANCE = new ResponseConformance();
56
57 public ResponseConformance() {
58 super();
59 }
60
61 @Override
62 public void process(final HttpResponse response, final EntityDetails entity, final HttpContext context)
63 throws HttpException, IOException {
64 Args.notNull(response, "HTTP response");
65 final int status = response.getCode();
66 switch (status) {
67 case HttpStatus.SC_NO_CONTENT:
68 case HttpStatus.SC_NOT_MODIFIED:
69 if (entity != null) {
70 throw new ProtocolException("Response " + status + " must not enclose an entity");
71 }
72 }
73 }
74
75 }