Added HttpUtils::HasValidators and HttpResponse::HasValidators

net/http/http_util.cc

 // 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.
 
 // The rules for parsing content-types were borrowed from Firefox:
 // http://lxr.mozilla.org/mozilla/source/netwerk/base/src/nsURLHelper.cpp#834
 
 #include "net/http/http_util.h"
 
 #include <algorithm>
@@ skipping 718 matching lines @@
   }
 
   base::Time last_modified;
   if (!base::Time::FromString(last_modified_header.c_str(), &last_modified))
     return false;
 
   base::Time date;
   if (!base::Time::FromString(date_header.c_str(), &date))
     return false;
 
+  // Last-Modified is implicitly weak unless it is at least 60 seconds before
+  // the Date value.
   return ((date - last_modified).InSeconds() >= 60);
 }
 
+bool HttpUtil::HasValidators(HttpVersion version,
+                             const std::string& etag_header,
+                             const std::string& last_modified_header) {
+  if (version < HttpVersion(1, 0))
+    return false;
+
+  base::Time last_modified;
+  if (base::Time::FromString(last_modified_header.c_str(), &last_modified))
+    return true;
+
+  return version >= HttpVersion(1, 1) && !etag_header.empty();
+}
+
 // Functions for histogram initialization.  The code 0 is put in the map to
 // track status codes that are invalid.
 // TODO(gavinp): Greatly prune the collected codes once we learn which
 // ones are not sent in practice, to reduce upload size & memory use.
 
 enum {
   HISTOGRAM_MIN_HTTP_STATUS_CODE = 100,
   HISTOGRAM_MAX_HTTP_STATUS_CODE = 599,
 };
 
@@ skipping 189 matching lines @@
       value_is_quoted_ = true;
       // Do not store iterators into this. See declaration of unquoted_value_.
       unquoted_value_ = HttpUtil::Unquote(value_begin_, value_end_);
     }
   }
 
   return true;
 }
 
 }  // namespace net