Added HttpUtils::HasValidators and HttpResponse::HasValidators

net/http/http_util.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_UTIL_H_
 #define NET_HTTP_HTTP_UTIL_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 187 matching lines @@
       const std::string& raw_language_list);
 
   // Helper. If |*headers| already contains |header_name| do nothing,
   // otherwise add <header_name> ": " <header_value> to the end of the list.
   static void AppendHeaderIfMissing(const char* header_name,
                                     const std::string& header_value,
                                     std::string* headers);
 
   // Returns true if the parameters describe a response with a strong etag or
   // last-modified header.  See section 13.3.3 of RFC 2616.
+  // An empty string should be passed for missing headers.
   static bool HasStrongValidators(HttpVersion version,
                                   const std::string& etag_header,
                                   const std::string& last_modified_header,
                                   const std::string& date_header);
 
+  // Returns true if this response has any validator (either a Last-Modified or
+  // an ETag) regardless of whether it is strong or weak.  See section 13.3.3 of
+  // RFC 2616.
+  // An empty string should be passed for missing headers.
+  static bool HasValidators(HttpVersion version,
+                            const std::string& etag_header,
+                            const std::string& last_modified_header);
+
   // Gets a vector of common HTTP status codes for histograms of status
   // codes.  Currently returns everything in the range [100, 600), plus 0
   // (for invalid responses/status codes).
   static std::vector<int> GetStatusCodesForHistogram();
 
   // Maps an HTTP status code to one of the status codes in the vector
   // returned by GetStatusCodesForHistogram.
   static int MapStatusCodeForHistogram(int code);
 
   // Used to iterate over the name/value pairs of HTTP headers.  To iterate
@@ skipping 167 matching lines @@
 
     // True if values are required for each name/value pair; false if a
     // name is permitted to appear without a corresponding value.
     bool values_optional_;
   };
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_UTIL_H_