app.dart

      // Rewrite URLs from relative to absolute so URLs
      // like /item/whatever properly load the app.
      // See http://goo.gl/Y5ERIY
      if (request.uri.path.contains('packages/')) {
        var path = request.uri.path.replaceFirst(new RegExp('^.*?packages/'), '');
        var file = new File(config['server']['directory'] + '/packages/$path');
        virtualDirectory.serveFile(file, request);
      } else if (request.uri.path.contains('static/')) {
        var path = request.uri.path.replaceFirst(new RegExp('^.*?static/'), '');
        var file = new File(config['server']['directory'] + '/static/$path');
        virtualDirectory.serveFile(file, request);
      // The following will handle either index.html or
      // post-build assets like index.html_bootstrap.dart.js etc.
      } else if (request.uri.path.contains('index.html')) {
        var path = request.uri.path.replaceFirst(new RegExp('^.*?index.html'), '');
        var file = new File(config['server']['directory'] + '/index.html$path');
        virtualDirectory.serveFile(file, request);
      } else if (request.uri.path.contains('index.dart')) {
        var path = request.uri.path.replaceFirst(new RegExp('^.*?index.dart'), '');
        var file = new File(config['server']['directory'] + '/index.dart$path');
        virtualDirectory.serveFile(file, request);
      // End of ugly relative/absolute handling.
      } else {
      ...
      }