Adding a Find method to the HeadersIterator class....

net/http/http_util.h

 // Copyright (c) 2006-2009 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 <vector>
 
 #include "base/string_tokenizer.h"
@@ skipping 141 matching lines @@
    public:
     HeadersIterator(std::string::const_iterator headers_begin,
                     std::string::const_iterator headers_end,
                     const std::string& line_delimiter);
 
     // Advances the iterator to the next header, if any.  Returns true if there
     // is a next header.  Use name* and values* methods to access the resultant
     // header name and values.
     bool GetNext();
 
+    // Iterates through the list of headers, starting with the current position
+    // and looks for the specified header.  Note that the name _must_ be
+    // lower cased.
+    // If the header was found, the return value will be true and the current
+    // position points to the header.  If the return value is false, the
+    // current position will be at the end of the headers.
+    bool AdvanceTo(const char* lowercase_name);
+
     std::string::const_iterator name_begin() const {
       return name_begin_;
     }
     std::string::const_iterator name_end() const {
       return name_end_;
     }
     std::string name() const {
       return std::string(name_begin_, name_end_);
     }
 
@@ skipping 49 matching lines @@
    private:
     StringTokenizer values_;
     std::string::const_iterator value_begin_;
     std::string::const_iterator value_end_;
   };
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_UTIL_H_