No 'Access-Control-Allow-Origin' - Node / Apache Port Issue

ghz 1years ago ⋅ 2315 views

Question

i've created a small API using Node/Express and trying to pull data using Angularjs but as my html page is running under apache on localhost:8888 and node API is listen on port 3000, i am getting the No 'Access-Control-Allow- Origin'. I tried using node-http-proxy and Vhosts Apache but not having much succes, please see full error and code below.

XMLHttpRequest cannot load localhost:3000. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'localhost:8888' is therefore not allowed access."

// Api Using Node/Express    
var express = require('express');
var app = express();
var contractors = [
    {   
     "id": "1", 
        "name": "Joe Blogg",
        "Weeks": 3,
        "Photo": "1.png"
    }
];

app.use(express.bodyParser());

app.get('/', function(req, res) {
  res.json(contractors);
});
app.listen(process.env.PORT || 3000);
console.log('Server is running on Port 3000')

Angular code

angular.module('contractorsApp', [])
.controller('ContractorsCtrl', function($scope, $http,$routeParams) {

   $http.get('localhost:3000').then(function(response) {
       var data = response.data;
       $scope.contractors = data;
   })

HTML

<body ng-app="contractorsApp">
    <div ng-controller="ContractorsCtrl"> 
        <ul>
            <li ng-repeat="person in contractors">{{person.name}}</li>
        </ul>
    </div>
</body>

Answer

Try adding the following middleware to your NodeJS/Express app (I have added some comments for your convenience):

// Add headers before the routes are defined
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();
});

(You might need to use 127.0.0.1 instead of localhost.)

#angularjs