Handle SIGINT exit, add hostname and \n to resp

- Ctrl+C on a Docker container sends SIGINT, which is not handled
  properly by default (see nodejs/node#4182). Added a signal handler.
- Adding trailing newline to response for curl-friendliness.
- Added log message indicating server is starting.
- Added hostname to indicate that the container.

Signed-off-by: Ahmet Alp Balkan <[email protected]>

hellonode/server.js

@@ -15,11 +15,19 @@
  */
 
 var http = require('http');
+var os = require('os');
+
+process.on('SIGINT', function() {
+  console.log('shutting down...');
+  process.exit();
+});
 
 var handleRequest = function(request, response) {
   console.log('Received request for URL: ' + request.url);
   response.writeHead(200);
-  response.end('Hello, World!');
+  response.end('Hello, World!\nHostname: ' + os.hostname() + '\n');
 };
+
 var www = http.createServer(handleRequest);
+console.log('server listening on port 8080');
 www.listen(8080);