How to add CORS headers to a Meteor app?

Question

How it is possible to add Access-Control-Allow-Origin: * header to all responses (in particular, I am interested for static files under /public/) in Meteor? I would need this so that external web apps can access data provides by my Meteor app. More information about enabling CORS is here.

Answer 1

Here is a little snippet I wrote. You can use as an example in how to access meteor's core connect and modify headers, also a pretty good drop-in for every meteor project:

/**
 * HTTP Header Security
 *
 * enforce HTTP Strict Transport Security (HSTS) to prevent ManInTheMiddle-attacks
 * on supported browsers (all but IE)
 * > http://www.html5rocks.com/en/tutorials/security/transport-layer-security
 *
 * @header Strict-Transport-Security: max-age=2592000; includeSubDomains
 */

var connectHandler = WebApp.connectHandlers; // get meteor-core's connect-implementation

// attach connect-style middleware for response header injection
Meteor.startup(function () {
  connectHandler.use(function (req, res, next) {
    res.setHeader('Strict-Transport-Security', 'max-age=2592000; includeSubDomains'); // 2592000s / 30 days
    return next();
  })
})