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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 MEDIA_BLINK_CACHE_UTIL_H_
6 #define MEDIA_BLINK_CACHE_UTIL_H_
7 
8 #include <vector>
9 
10 #include "base/basictypes.h"
11 #include "media/base/media_export.h"
12 
13 namespace blink {
14 class WebURLResponse;
15 }
16 
17 namespace media {
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 MEDIA_EXPORT GetReasonsForUncacheability(
37     const blink::WebURLResponse& response);
38 
39 }  // namespace media
40 
41 #endif  // MEDIA_BLINK_CACHE_UTIL_H_
42