I am trying to put an authorization header in my requests but it doesn't work. 

I am using this:

```
var config = {headers: {
  'Authorization': token
  }
};
return $http.get('http://localhost:3000/apis/users/all', config);

```

And also I tried this:

```
$http.defaults.headers.common['Authorization'] = token;

```

But with both cases I got this headers in the back-end request:

```
Accept:*/*
Accept-Encoding:gzip, deflate, sdch
Accept-Language:es-ES,es;q=0.8,ca;q=0.6,en;q=0.4,gl;q=0.2
Access-Control-Request-Headers:accept, authorization
Access-Control-Request-Method:GET
Connection:keep-alive
Host:localhost:3000
Origin:http://localhost:8000
Referer:http://localhost:8000/
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_4)         AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36

```

I need something like this:

```
Authorization: token

```

But I got this:

```
Access-Control-Request-Headers:accept, authorization

```

Then, I don't have in any place the token value.

I am using expressjs for the back-end and I using this for CORS:

```
app.use(function(req, res, next) {
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept, Authorization');
    next();
  });

```

Also say that testing with the chrome extension Advance Rest Client it is working fine. In the request header there is a Authorization: valueOfToken..

Thanks a lot.