Extract an http_parser package from shelf.

pkg/shelf/lib/src/request.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library shelf.request;
 
 import 'dart:async';
 import 'dart:collection';
 
 // TODO(kevmoo): use UnmodifiableMapView from SDK once 1.4 ships
 import 'package:collection/wrappers.dart' as pc;
+import 'package:http_parser/http_parser.dart';
 import 'package:path/path.dart' as p;
 
 import 'message.dart';
-import 'util.dart';
 
 /// Represents an HTTP request to be processed by a Shelf application.
 class Request extends Message {
   /// The remainder of the [requestedUri] path designating the virtual
   /// "location" of the request's target within the handler.
   ///
   /// [pathInfo] may be an empty string, if [requestedUri ]targets the handler
   /// root and does not have a trailing slash.
   ///
   /// [pathInfo] is never null. If it is not empty, it will start with `/`.
@@ skipping 73 matching lines @@
   /// Convenience property to access [pathInfo] data as a [List].
   List<String> get pathSegments {
     var segs = p.url.split(pathInfo);
     if (segs.length > 0) {
       assert(segs.first == p.url.separator);
       segs.removeAt(0);
     }
     return segs;
   }
 }