anchor.diff:      Map headers;
       var contentType = mime.lookupMimeType(path);
       if (contentType != null) {
  -      headers = <String, String>{io.HttpHeaders.CONTENT_TYPE: contentType};
  +      headers = <String, String>{
  +        io.HttpHeaders.CONTENT_TYPE: contentType
  +      };
       }
   
       return new Response.ok(stream, headers: headers);
     }, onError: (err, stack) {
  -    ae.context.services.logging.error('Error getting asset at path $path\n'
  -        '$err\n$stack');
  +    ae.context.services.logging.error(
  +        'Error getting asset at path $path\n$err\n$stack');
       // TODO(kevmoo): handle only the specific case of an asset not found
       // https://github.com/dart-lang/appengine/issues/7
       if (err is ae.AssetError) {
  
positive.code: import 'package:shelf/shelf.dart';
  import 'package:shelf/shelf_io.dart' as shelf_io;
  
  Future serve(Handler handler, {Function onError}) {
    return ae.runAppEngine((io.HttpRequest request) {
      shelf_io.handleRequest(request, handler);
    }, onError: onError);
  }
  
  final Handler assetHandler = _assetHandler;
  
  _assetHandler(Request request) {
  
negative.code: // 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.
  
  /// Provides hosting of `Shelf` handlers via App Engine.
  library shelf_appengine;
  
  import 'dart:async';
  