static_server.js

// Basic static server setup with Node.js
var http         = require("http"),
    url          = require("url"),
    path         = require("path"),
    fs           = require("fs"),
    contentTypes = require('./content-types'),
    sysInfo      = require('./sys-info'),
    port         = process.argv[2] || 8888;

http.createServer(function(request, response) {
  var uri = url.parse(request.url).pathname,
      filePath = ~uri.indexOf('/assets/') ? '/../' + uri : '/../build/content' + uri,
      filename = path.join(__dirname + filePath);

  // IMPORTANT: Your application HAS to respond to GET /health with status 200
  //            for OpenShift health monitoring
  if (uri === '/health') {
    response.writeHead(200);
    response.end();
    return;
  } else if (~uri.indexOf('/info')) {
    response.setHeader('Content-Type', 'application/json');
    response.setHeader('Cache-Control', 'no-cache, no-store');
    response.end(JSON.stringify(sysInfo.gen()));
    return;
  }

  fs.exists(filename, function(exists) {
    if (!exists) {
      response.writeHead(404, {"Content-Type": "text/plain"});
      response.write("404 Not Found\n");
      response.end();
      return;
    }

    if (fs.statSync(filename).isDirectory()) filename += '/index.html';

    fs.readFile(filename, "binary", function(err, file) {
      let ext = path.extname(uri).slice(1);

      if (err) {
        response.writeHead(500, {"Content-Type": "text/plain"});
        response.write(err + "\n");
        response.end();
        return;
      }

      response.setHeader('Content-Type', contentTypes[ext] || "text/html");
      response.writeHead(200);
      response.write(file, "binary");
      response.end();
    });
  });
}).listen(parseInt(port, 10));

console.log("Static file server running at\n  => http://localhost:" + port + "/\nCTRL + C to shutdown");