Range request support for parallel download in DownloadRequestCore.

net/http/http_request_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.
 //
 // HttpRequestHeaders manages the request headers.
 // It maintains these in a vector of header key/value pairs, thereby maintaining
 // the order of the headers.  This means that any lookups are linear time
 // operations.
 
 #ifndef NET_HTTP_HTTP_REQUEST_HEADERS_H_
@@ skipping 55 matching lines @@
   static const char kAcceptCharset[];
   static const char kAcceptEncoding[];
   static const char kAcceptLanguage[];
   static const char kAuthorization[];
   static const char kCacheControl[];
   static const char kConnection[];
   static const char kContentType[];
   static const char kCookie[];
   static const char kContentLength[];
   static const char kHost[];
+  static const char kIfMatch[];
   static const char kIfModifiedSince[];
   static const char kIfNoneMatch[];
   static const char kIfRange[];
+  static const char kIfUnmodifiedSince[];
   static const char kOrigin[];
   static const char kPragma[];
   static const char kProxyAuthorization[];
   static const char kProxyConnection[];
   static const char kRange[];
   static const char kReferer[];
   static const char kTransferEncoding[];
   static const char kTokenBinding[];
   static const char kUserAgent[];
 
@@ skipping 94 matching lines @@
   // Allow the copy construction and operator= to facilitate copying in
   // HttpRequestHeaders.
   // TODO(willchan): Investigate to see if we can remove the need to copy
   // HttpRequestHeaders.
   // DISALLOW_COPY_AND_ASSIGN(HttpRequestHeaders);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_REQUEST_HEADERS_H_