add hello_server.ts

single_file_tests/hello_server.ts

@@ -0,0 +1,10 @@
+import { serve } from "https://deno.land/std/http/server.ts";
+
+window.onload = async function() {
+  console.log('Start listen :8000 ...');
+  const body = new TextEncoder().encode("Hello World\n");
+  for await (const req of serve(":8000")) {
+    console.log('Received request: ' + JSON.stringify(req.conn));
+    req.respond({ body });
+  }
+};