media/blink/cache_util.h

   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_