I'm trying to build a web server in node.js that will support cross-domain scripting, while still providing static files from a public directory. I'm using the express.js and am not really sure how to allow cross-domain scripting (Access-Control-Allow-Origin: *
).
I saw this post, which I did not find helpful.
var express = require('express')
, app = express.createServer();
app.get('/', function (req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
next();
});
app.configure(function () {
app.use(express.methodOverride());
app.use(express.bodyParser());
app.use(app.router);
});
app.configure('development', function () {
app.use(express.static(__dirname + '/public'));
app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
});
app.configure('production', function () {
var oneYear = 31557600000;
// app.use(express.static(__dirname + '/public', { maxAge: oneYear }));
app.use(express.static(__dirname + '/public'));
app.use(express.errorHandler());
});
app.listen(8888);
console.log('express running at http://localhost:%d', 8888);
Check out the example from enable-cors.org:
In your ExpressJS app on node.js, do the following with your routes:
app.all('/', function(req, res, next) { res.header("Access-Control-Allow-Origin", "*"); res.header("Access-Control-Allow-Headers", "X-Requested-With"); next(); }); app.get('/', function(req, res, next) { // Handle the get for this route }); app.post('/', function(req, res, next) { // Handle the post for this route });
The first call (app.all
) should be made before all the other routes in your app (or at least the ones you want to be CORS enabled).
[Edit]
If you want the headers to show up for static files as well, try this (make sure it's before the call to use(express.static())
:
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
next();
});
I tested this with your code, and got the headers on assets from the public
directory:
var express = require('express')
, app = express.createServer();
app.configure(function () {
app.use(express.methodOverride());
app.use(express.bodyParser());
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
next();
});
app.use(app.router);
});
app.configure('development', function () {
app.use(express.static(__dirname + '/public'));
app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
});
app.configure('production', function () {
app.use(express.static(__dirname + '/public'));
app.use(express.errorHandler());
});
app.listen(8888);
console.log('express running at http://localhost:%d', 8888);
You could, of course, package the function up into a module so you can do something like
// cors.js
module.exports = function() {
return function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
next();
};
}
// server.js
cors = require('./cors');
app.use(cors());