Add Hello World webserver

Author: visola

Lesson03/sample_http/http_server.js

@@ -0,0 +1,15 @@
+const http = require('http');
+
+const server = http.createServer();
+
+server.on('request', (request, response) => {
+  console.log('Request received.', request.url);
+  response.writeHead(200, { 'Content-type': 'text/plain' });
+  response.write('Hello world!');
+  response.end();
+});
+
+const port = 3000;
+console.log('Starting server on port %d.', port);
+console.log('Go to: http://localhost:%d', port);
+server.listen(port);