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1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef CONTENT_RENDERER_MEDIA_CACHE_UTIL_H_ | |
6 #define CONTENT_RENDERER_MEDIA_CACHE_UTIL_H_ | |
7 | |
8 #include <vector> | |
9 | |
10 #include "base/basictypes.h" | |
11 #include "content/common/content_export.h" | |
12 | |
13 namespace blink { | |
14 class WebURLResponse; | |
15 } | |
16 | |
17 namespace content { | |
18 | |
19 // Reasons that a cached WebURLResponse will *not* prevent a future request to | |
20 // the server. Reported via UMA, so don't change/reuse previously-existing | |
21 // values. | |
22 enum UncacheableReason { | |
23 kNoData = 1 << 0, // Not 200 or 206. | |
24 kPre11PartialResponse = 1 << 1, // 206 but HTTP version < 1.1. | |
25 kNoStrongValidatorOnPartialResponse = 1 << 2, // 206, no strong validator. | |
26 kShortMaxAge = 1 << 3, // Max age less than 1h (arbitrary value). | |
27 kExpiresTooSoon = 1 << 4, // Expires in less than 1h (arbitrary value). | |
28 kHasMustRevalidate = 1 << 5, // Response asks for revalidation. | |
29 kNoCache = 1 << 6, // Response included a no-cache header. | |
30 kNoStore = 1 << 7, // Response included a no-store header. | |
31 kMaxReason // Needs to be one more than max legitimate reason. | |
32 }; | |
33 | |
34 // Return the logical OR of the reasons "response" cannot be used for a future | |
35 // request (using the disk cache), or 0 if it might be useful. | |
36 uint32 CONTENT_EXPORT GetReasonsForUncacheability( | |
37 const blink::WebURLResponse& response); | |
38 | |
39 } // namespace content | |
40 | |
41 #endif // CONTENT_RENDERER_MEDIA_CACHE_UTIL_H_ | |
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