Node.js: returning "this" from writeHead() to allow chaining.

In Node.js version 11.10.0 and later, the writeHead() function returns "this".

test/node/404/app.js

@@ -3,6 +3,5 @@
 var fs = require('fs');
 
 require('unit-http').createServer(function (req, res) {
-    res.writeHead(404, {});
-    res.end(fs.readFileSync('404.html'));
+    res.writeHead(404, {}).end(fs.readFileSync('404.html'));
 }).listen(7080);