Fix Directory path in VirtualDirectory, so it always ends with a platform-specific seperator. That'…

pkg/http_server/lib/src/virtual_directory.dart

 // Copyright (c) 2013, 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.
 
 part of http_server;
 
 /**
  * A [VirtualDirectory] can serve files and directory-listing from a root path,
  * to [HttpRequest]s.
  *
@@ skipping 79 matching lines @@
     _errorCallback = callback;
   }
 
   Future<FileSystemEntity> _locateResource(String path,
                                            Iterator<String> segments) {
     // Don't allow navigating up paths.
     if (segments.current == "..") return new Future.value(null);
     path = normalize(path);
     // If we jail to root, the relative path can never go up.
     if (jailRoot && split(path).first == "..") return new Future.value(null);
-    String fullPath() => join(root, path);
+    String fullPath({bool endSlash: false}) {
+      var p = join(root, path);
+      if (endSlash && path != ".") p = "$p$separator";
+      return p;
+    }
     return FileSystemEntity.type(fullPath(), followLinks: false)
         .then((type) {
           switch (type) {
             case FileSystemEntityType.FILE:
               if (segments.current == null) {
                 return new File(fullPath());
               }
               break;
 
             case FileSystemEntityType.DIRECTORY:
               if (segments.current == null) {
                 if (allowDirectoryListing) {
-                  return new Directory(fullPath());
+                  return new Directory(fullPath(endSlash: true));
                 }
               } else {
                 if (_invalidPathRegExp.hasMatch(segments.current)) break;
                 return _locateResource(join(path, segments.current),
                                        segments..moveNext());
               }
               break;
 
             case FileSystemEntityType.LINK:
               if (followLinks) {
@@ skipping 253 matching lines @@
 
   Future close() => new Future.value();
 
   void setMimeType(var bytes) {
     var mimeType = lookupMimeType(path, headerBytes: bytes);
     if (mimeType != null) {
       response.headers.contentType = ContentType.parse(mimeType);
     }
   }
 }