add single files, secure server, hello world

single_file_tests/simple_server.dart

@@ -0,0 +1,22 @@
+import 'dart:io';
+
+main() async {
+  dartHandler(HttpRequest request) {
+    request.response.headers.contentType =
+        new ContentType('text', 'plain');
+    request.response.write('Dart is optionally typed');
+    request.response.close();
+  }
+
+  print('Listen at :8888');
+  var requests = await HttpServer.bind('0.0.0.0', 8888);
+  await for (var request in requests) {
+    print('Got request for ${request.uri.path}');
+    if (request.uri.path == '/languages/dart') {
+      dartHandler(request);
+    } else {
+      request.response.write('Not found');
+      request.response.close();
+    }
+  }
+}