anchor.diff:        }
         f.openRead().pipe(response).catchError(onError);
       });
  +  }
  +
  +  void compileToJavaScript(Uri dartScript) {
  +    Uri outputUri = request.uri;
  +    print("Compiling $dartScript to $outputUri");
  +    // TODO(ahe): Implement this.
  +    notFound(request.uri);
     }
   
     static onRequest(HttpRequest request) {
  
positive.code:   }
  
    badRequest(String problem) {
      response.statusCode = HttpStatus.BAD_REQUEST;
      response.write(htmlInfo("Bad request",
                              "Bad request '${request.uri}': $problem"));
      response.close();
    }
  
    internalError(error, stack) {
      print(error);
      if (stack != null) print(stack);
      response.statusCode = HttpStatus.INTERNAL_SERVER_ERROR;
      response.write(htmlInfo("Internal Server Error",
                              "Internal Server Error: $error\n$stack"));
      response.close();
    }
  
  
negative.code:   }
  
    notFound(path) {
      response.headers.set(CONTENT_TYPE, 'text/html');
      response.statusCode = HttpStatus.NOT_FOUND;
      response.write(htmlInfo('Not Found',
                              'The file "$path" could not be found.'));
  