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| 1 // Copyright (c) 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 #include "chrome/browser/google_apis/request_util.h" |  | 
| 6 |  | 
| 7 #include <string> |  | 
| 8 |  | 
| 9 namespace google_apis { |  | 
| 10 namespace util { |  | 
| 11 |  | 
| 12 namespace { |  | 
| 13 |  | 
| 14 // etag matching header. |  | 
| 15 const char kIfMatchHeaderPrefix[] = "If-Match: "; |  | 
| 16 |  | 
| 17 }  // namespace |  | 
| 18 |  | 
| 19 const char kIfMatchAllHeader[] = "If-Match: *"; |  | 
| 20 |  | 
| 21 std::string GenerateIfMatchHeader(const std::string& etag) { |  | 
| 22   return etag.empty() ? kIfMatchAllHeader : (kIfMatchHeaderPrefix + etag); |  | 
| 23 } |  | 
| 24 |  | 
| 25 }  // namespace util |  | 
| 26 }  // namespace google_apis |  | 
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