1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27 package org.apache.hc.client5.http.impl.cache;
28
29 import java.io.IOException;
30 import java.time.Instant;
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.HttpHeaders;
37 import org.apache.hc.core5.http.HttpResponse;
38 import org.apache.hc.core5.http.HttpResponseInterceptor;
39 import org.apache.hc.core5.http.HttpStatus;
40 import org.apache.hc.core5.http.message.BasicHeader;
41 import org.apache.hc.core5.http.protocol.HttpContext;
42
43
44
45
46
47
48
49
50 @Contract(threading = ThreadingBehavior.IMMUTABLE)
51 class ResponseCacheConformance implements HttpResponseInterceptor {
52
53 public static final ResponseCacheConformance INSTANCE = new ResponseCacheConformance();
54
55 private final static String[] DISALLOWED_ENTITY_HEADERS = {
56 HttpHeaders.CONTENT_ENCODING,
57 HttpHeaders.CONTENT_LANGUAGE,
58 HttpHeaders.CONTENT_LENGTH,
59 HttpHeaders.CONTENT_MD5,
60 HttpHeaders.CONTENT_RANGE,
61 HttpHeaders.CONTENT_TYPE
62 };
63
64 @Override
65 public void process(final HttpResponse response,
66 final EntityDetails entity,
67 final HttpContext context) throws HttpException, IOException {
68 if (response.getCode() == HttpStatus.SC_NOT_MODIFIED) {
69 for (final String headerName : DISALLOWED_ENTITY_HEADERS) {
70 response.removeHeaders(headerName);
71 }
72 }
73 if (!response.containsHeader(HttpHeaders.DATE)) {
74 response.addHeader(new BasicHeader(HttpHeaders.DATE, Instant.now()));
75 }
76 }
77
78 }