sendfile.js

var http = require('http');
var fs = require('fs');
var usage = `Usage: ${process.argv[0]} ${process.argv[1]} <filepath> <mimetype> [port]`;
var filePath = process.argv[2];
if (!filePath) {
  throw new Error(usage);
}
var mimetype = process.argv[3]
if (!mimetype) {
  throw new Error(usage);
}
var port = parseInt(process.argv[4], 10) || 3001;
console.log(`Listening http://localhost:${port}`);
http.createServer(function(req, res) {
  var stat = fs.statSync(filePath);
  res.writeHead(200, {
    'Content-Type': mimetype,
    'Content-Length': stat.size
  });
  fs.createReadStream(filePath).pipe(res);
}).listen(port);