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const http = require('http');
const express = require('express');
const bodyParser = require('body-parser');

const app = express();

app.all('*',function(req,res,next){
	res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'OPTIONS,GET,POST,PUT,DELETE');
    res.header('Access-Control-Allow-Headers', 'Content-Type');

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//Recursive Loop Syntax

function recursiveLoop(data, inputlength) {
    if (inputlength >= 0) {
        var currentdata = data[inputlength];
        inputlength = inputlength - 1;
        recursiveLoop(data,inputlength);
    }
    else{
        //Response here

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#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;

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//callback test
function getInfo(options, callback){
    http.get(options, function(res) {
        console.error("Got response: " + res.statusCode);
        res.on("data", function(chunk) {
        console.error("BODY: " + chunk);
        text = '' + chunk;
        return callback(text);
    });
    }).on('error', function(e) {

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How to setup Let's Encrypt for Nginx on Ubuntu 16.04 (including IPv6, HTTP/2 and A+ SLL rating)

There are two main modes to run the Let's Encrypt client (called Certbot):

• Standalone: replaces the webserver to respond to ACME challenges
• Webroot: needs your webserver to serve challenges from a known folder.

Webroot is better because it doesn't need to replace Nginx (to bind to port 80).

In the following, we're setting up mydomain.com. HTML is served from /var/www/mydomain, and challenges are served from /var/www/letsencrypt.

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const getCourses = () => {
    return new Promise( (resolve, reject) => {
        S3.getObject({
            Bucket: 'your-bucket-here',
            Key: 'your-file.json'
        }, function (err, data){
            if (err !== null){
                reject(err)
            }
            resolve(JSON.parse(data.Body.toString('utf-8')))

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Handlebars es un sistema de plantillas web semantico iniciado por Yehuda Katz en el 2010.
Handlebars.js es una extensión de Mustache, y además de renderear plantillas propias de Handlebars, 
puede renderear plantillas Mustache.
More: http://handlebarsjs.com/
      http://mustache.github.io/mustache.5.html

1. Expresiones.

1.1 Uso básico.

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{
	"window.zoomLevel": 0,
	"workbench.iconTheme": "vscode-great-icons",
	"workbench.startupEditor": "newUntitledFile",
	"workbench.editor.enablePreview": false,
	"workbench.editor.enablePreviewFromQuickOpen": false,
	"editor.wordWrap": "off",
	"git.enabled": false,
	"git.autofetch": false,
	"telemetry.enableTelemetry": false,

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Two way iframe communication

The main difference between the two pages is the method of sending messages. Recieving messages is the same in both.

Parent

Send messages to iframe using iframeEl.contentWindow.postMessage Recieve messages using window.addEventListener('message')

iframe

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//Angular 2 above application static server

const http = require('http');
const express = require('express');
const proxy = require('http-proxy-middleware');
const path = require('path');

const app = express();
app.use(express.static('client'));