app.use(function(req, res, next) {

  res.header("Access-Control-Allow-Origin", "*");

  res.header("Access-Control-Allow-Headers", "X-Requested-With");

  next();

  });

app.use(function(req, res, next) {

  res.header("Access-Control-Allow-Origin", "*");

  res.header("Access-Control-Allow-Headers", "X-Requested-With");

  next();

  });

​

// Add headers

app.use(function (req, res, next) {

​

    // Website you wish to allow to connect

    res.setHeader('Access-Control-Allow-Origin', 'http://localhost:8888');

​

    // Request methods you wish to allow

    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');

​

    // Request headers you wish to allow

    res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');

​

    // Set to true if you need the website to include cookies in the requests sent

    // to the API (e.g. in case you use sessions)

    res.setHeader('Access-Control-Allow-Credentials', true);

​

    // Pass to next layer of middleware

    next();

});

​

Access-Control-Allow-Origin: *

Access-Control-Allow-Origin: <origin>

Access-Control-Allow-Origin: null

fetch('https://cortex.fun', {mode: 'no-cors'}) // >> {mode: 'no-cors'} <<

.then(res => res.json())

.then(data => console.log(data))

<?php

header("Access-Control-Allow-Origin: *");

...

?>

var config = {

development: {

    //url to be used in link generation

    url: 'http://my.site.com',

    //mongodb connection settings

    database: {

        host:   '127.0.0.1',

        port:   '27017',

        db:     'site_dev'

    },

    //server details

    server: {

        host: '127.0.0.1',

        port: '3422'

    }

},

production: {

    //url to be used in link generation

    url: 'http://my.site.com',

    //mongodb connection settings

    database: {

        host: '127.0.0.1',

        port: '27017',

        db:     'site'

    },

    //server details

    server: {

        host:   '127.0.0.1',

        port:   '3421'

    }

}

};

module.exports = config;

​