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.http2.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.ProtocolVersion;
38 import org.apache.hc.core5.http.message.MessageSupport;
39 import org.apache.hc.core5.http.protocol.HttpContext;
40 import org.apache.hc.core5.http.protocol.ResponseContent;
41 import org.apache.hc.core5.util.Args;
42
43 /**
44 * HTTP/2 compatible extension of {@link ResponseContent}.
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 5.0
51 */
52 @Contract(threading = ThreadingBehavior.IMMUTABLE)
53 public class H2ResponseContent extends ResponseContent {
54
55 /**
56 * Singleton instance.
57 *
58 * @since 5.2
59 */
60 public static final H2ResponseContent INSTANCE = new H2ResponseContent();
61
62 public H2ResponseContent() {
63 super();
64 }
65
66 public H2ResponseContent(final boolean overwrite) {
67 super(overwrite);
68 }
69
70 @Override
71 public void process(
72 final HttpResponse response,
73 final EntityDetails entity,
74 final HttpContext context) throws HttpException, IOException {
75 Args.notNull(context, "HTTP context");
76 final ProtocolVersion ver = context.getProtocolVersion();
77 if (ver.getMajor() < 2) {
78 super.process(response, entity, context);
79 } else if (entity != null) {
80 MessageSupport.addContentTypeHeader(response, entity);
81 MessageSupport.addContentEncodingHeader(response, entity);
82 MessageSupport.addTrailerHeader(response, entity);
83 }
84 }
85
86 }