Added HttpUtils::HasValidators and HttpResponse::HasValidators

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 240 matching lines @@
   // 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.
   bool HasStrongValidators() const;
 
+  // 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.
+  bool HasValidators() const;
+
   // Extracts the value of the Content-Length header or returns -1 if there is
   // no such header in the response.
   int64_t GetContentLength() const;
 
   // Extracts the value of the specified header or returns -1 if there is no
   // such header in the response.
   int64_t GetInt64HeaderValue(const std::string& header) const;
 
   // Extracts the values in a Content-Range header and returns true if they are
   // valid for a 206 response; otherwise returns false.
@@ skipping 130 matching lines @@
 
   // The normalized http version (consistent with what GetStatusLine() returns).
   HttpVersion http_version_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpResponseHeaders);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_RESPONSE_HEADERS_H_