1 /*
2 * ====================================================================
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * 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, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ====================================================================
19 *
20 * This software consists of voluntary contributions made by many
21 * individuals on behalf of the Apache Software Foundation. For more
22 * information on the Apache Software Foundation, please see
23 * <http://www.apache.org/>.
24 */
25 package org.apache.http.client.protocol;
26
27 import java.io.IOException;
28
29 import org.apache.http.HttpException;
30 import org.apache.http.HttpRequest;
31 import org.apache.http.HttpRequestInterceptor;
32 import org.apache.http.annotation.Immutable;
33 import org.apache.http.protocol.HttpContext;
34
35 /**
36 * Class responsible for handling Content Encoding requests in HTTP.
37 * <p>
38 * Instances of this class are stateless, therefore they're thread-safe and immutable.
39 *
40 * @see "http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.5"
41 *
42 * @since 4.1
43 */
44 @Immutable
45 public class RequestAcceptEncoding implements HttpRequestInterceptor {
46
47 /**
48 * Adds the header {@code "Accept-Encoding: gzip,deflate"} to the request.
49 */
50 public void process(
51 final HttpRequest request,
52 final HttpContext context) throws HttpException, IOException {
53
54 /* Signal support for Accept-Encoding transfer encodings. */
55 if (!request.containsHeader("Accept-Encoding")) {
56 request.addHeader("Accept-Encoding", "gzip,deflate");
57 }
58 }
59
60 }