No 'Access-Control-Allow-Origin' header in Angular 2 app

You can read more about that from here: http://www.html5rocks.com/en/tutorials/cors/.

Your resource methods won't get hit, so their headers will never get set. The reason is that there is what's called a preflight request before the actual request, which is an OPTIONS request. So the error comes from the fact that the preflight request doesn't produce the necessary headers. check that you will need to add following in your .htaccess file:

Header set Access-Control-Allow-Origin "*"

This a problem with the CORS configuration on the server. It is not clear what server are you using, but if you are using Node+express you can solve it with the following code

// 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();
});

that code was an answer of @jvandemo to a very similar question.