Allow automatic use of stale cache entries if site is unreachable.

net/http/http_cache_transaction.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file declares HttpCache::Transaction, a private class of HttpCache so
 // it should only be included by http_cache.cc
 
 #ifndef NET_HTTP_HTTP_CACHE_TRANSACTION_H_
 #define NET_HTTP_HTTP_CACHE_TRANSACTION_H_
 
 #include <string>
+#include <vector>
 
 #include "base/time.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_log.h"
 #include "net/http/http_cache.h"
 #include "net/http/http_response_info.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_transaction.h"
 
 namespace net {
@@ skipping 350 matching lines @@
 
   // Resets cache_io_start_ to the current time, if |return_value| is
   // ERR_IO_PENDING.
   // Returns |return_value|.
   int ResetCacheIOStart(int return_value);
 
   void ScheduleDelayedLoop(base::TimeDelta delay, int result);
   void RunDelayedLoop(base::TimeTicks delay_start_time,
                       base::TimeDelta intended_delay, int result);
 
+#if !defined(NDEBUG)
+  void DumpStatePath();
+#endif
+
   State next_state_;
   const HttpRequestInfo* request_;
   BoundNetLog net_log_;
   scoped_ptr<HttpRequestInfo> custom_request_;
   HttpRequestHeaders request_headers_copy_;
   // If extra_headers specified a "if-modified-since" or "if-none-match",
   // |external_validation_| contains the value of those headers.
   ValidationHeaders external_validation_;
   base::WeakPtr<HttpCache> cache_;
   HttpCache::ActiveEntry* entry_;
   HttpCache::ActiveEntry* new_entry_;
   scoped_ptr<HttpTransaction> network_trans_;
   scoped_ptr<InfiniteCacheTransaction> infinite_cache_transaction_;
   CompletionCallback callback_;  // Consumer's callback.
   HttpResponseInfo response_;
   HttpResponseInfo auth_response_;
   const HttpResponseInfo* new_response_;
   std::string cache_key_;
   Mode mode_;
   State target_state_;
   bool reading_;  // We are already reading.
   bool invalid_range_;  // We may bypass the cache for this request.
   bool truncated_;  // We don't have all the response data.
   bool is_sparse_;  // The data is stored in sparse byte ranges.
   bool range_requested_;  // The user requested a byte range.
   bool handling_206_;  // We must deal with this 206 response.
   bool cache_pending_;  // We are waiting for the HttpCache.
   bool done_reading_;
   bool vary_mismatch_;  // The request doesn't match the stored vary data.
+  bool couldnt_conditionalize_request_;
   scoped_refptr<IOBuffer> read_buf_;
   int io_buf_len_;
   int read_offset_;
   int effective_load_flags_;
   int write_len_;
   scoped_ptr<PartialData> partial_;  // We are dealing with range requests.
   UploadProgress final_upload_progress_;
   base::WeakPtrFactory<Transaction> weak_factory_;
   CompletionCallback io_callback_;
 
@@ skipping 14 matching lines @@
   // a delay on return, we must defer that delay until AddToEntry has been
   // called, to avoid a race condition on the address returned.
   base::TimeDelta deferred_cache_sensitivity_delay_;
   bool defer_cache_sensitivity_delay_;
 
   // For sensitivity analysis, the simulated increase in cache service times,
   // in percent.
   int sensitivity_analysis_percent_increase_;
 
   HttpTransactionDelegate* transaction_delegate_;
+
+#if !defined(NDEBUG)
+  // Record of all states this transaction has moved through.
+  std::vector<int> state_path_;
+#endif
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_CACHE_TRANSACTION_H_