Use HttpRequestHeaders for extra_headers.

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 36 matching lines @@
 
   // Scans the headers and look for the first "Range" header in |headers|,
   // if "Range" exists and the first one of it is well formatted then returns
   // true, |ranges| will contain a list of valid ranges. If return
   // value is false then values in |ranges| should not be used. The format of
   // "Range" header is defined in RFC 2616 Section 14.35.1.
   // http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35.1
   static bool ParseRanges(const std::string& headers,
                           std::vector<HttpByteRange>* ranges);
 
+  // Same thing as ParseRanges except the Range header is known and its value
+  // is directly passed in, rather than requiring searching through a string.
+  static bool ParseRangeHeader(const std::string& range_specifier,
+                               std::vector<HttpByteRange>* ranges);
+
   // Scans the '\r\n'-delimited headers for the given header name.  Returns
   // true if a match is found.  Input is assumed to be well-formed.
   // TODO(darin): kill this
   static bool HasHeader(const std::string& headers, const char* name);
 
   // Strips all header lines from |headers| whose name matches
   // |headers_to_remove|. |headers_to_remove| is a list of null-terminated
   // lower-case header names, with array length |headers_to_remove_len|.
   // Returns the stripped header lines list, separated by "\r\n".
   static std::string StripHeaders(const std::string& headers,
@@ skipping 172 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_