helmet, external_ip, emergency_shutdown added

source/app.js

@@ -9,6 +9,7 @@ const config = require(config_path)
 const express = require('express')
 const logger = require('./lib/logger')
 const routes = require(routes_path)
+const helmet = require('helmet')
 
 // loggers
 const logger_init = new logger(init_log_path)
@@ -16,6 +17,8 @@ const logger_runtime = new logger(runtime_log_path)
 
 const app = express()
 
+app.use(helmet())
+
 // logger
 app.use(function(req, res, next) {
     var {url} = req