Initial implementation of Chrome-Freshness header.

net/http/http_response_headers.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.
 
 #ifndef NET_HTTP_HTTP_RESPONSE_HEADERS_H_
 #define NET_HTTP_HTTP_RESPONSE_HEADERS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 211 matching lines @@
                                 const base::Time& current_time) const;
 
   // The following methods extract values from the response headers.  If a
   // value is not present, then false is returned.  Otherwise, true is returned
   // and the out param is assigned to the corresponding value.
   bool GetMaxAgeValue(base::TimeDelta* value) const;
   bool GetAgeValue(base::TimeDelta* value) const;
   bool GetDateValue(base::Time* value) const;
   bool GetLastModifiedValue(base::Time* value) const;
   bool GetExpiresValue(base::Time* value) const;
+  bool GetStaleWhileRevalidateValue(base::TimeDelta* value) const;
 
   // Extracts the time value of a particular header.  This method looks for the
   // first matching header value and parses its value as a HTTP-date.
   bool GetTimeValuedHeader(const std::string& name, base::Time* result) const;
 
   // Determines if this response indicates a keep-alive connection.
   bool IsKeepAlive() const;
 
   // Returns true if this response has a strong etag or last-modified header.
   // See section 13.3.3 of RFC 2616.
@@ skipping 71 matching lines @@
   // with line_begin and end pointing at the begin and end of this line.
   // Output will be a normalized version of this.
   void ParseStatusLine(std::string::const_iterator line_begin,
                        std::string::const_iterator line_end,
                        bool has_headers);
 
   // Find the header in our list (case-insensitive) starting with parsed_ at
   // index |from|.  Returns string::npos if not found.
   size_t FindHeader(size_t from, const base::StringPiece& name) const;
 
+  // Search the Cache-Control header for a directive matching |directive|. If
+  // present, treat its value as a time offset in seconds, write it to |result|,
+  // and return true.
+  bool GetCacheControlDirective(const base::StringPiece& directive,
+                                base::TimeDelta* result) const;
+
   // Add a header->value pair to our list.  If we already have header in our
   // list, append the value to it.
   void AddHeader(std::string::const_iterator name_begin,
                  std::string::const_iterator name_end,
                  std::string::const_iterator value_begin,
                  std::string::const_iterator value_end);
 
   // Add to parsed_ given the fields of a ParsedHeader object.
   void AddToParsed(std::string::const_iterator name_begin,
                    std::string::const_iterator name_end,
@@ skipping 48 matching lines @@
 
   // The parsed http version number (not normalized).
   HttpVersion parsed_http_version_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpResponseHeaders);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_RESPONSE_HEADERS_H_