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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_
     42