所请求的资源上没有“ Access-Control-Allow-Origin”标头。 -React / Node API

Question

I'm trying to get passport authentication with twitter to work. My setup is as follows: React(with redux) frontend (create-react-app), Node (with express) API. Both are running on localhost (different ports).
User goes to /login and clicks on a button that dispatches a login action:

export function login() {
    return dispatch => {
        return axios.get('/api/auth/twitter')
          .then(() => {})
    }
}

The route on the server:

router.get('/twitter', passport.authenticate('twitter'));

And the route for the callback:

router.get('/twitter/callback', passport.authenticate('twitter', {failureRedirect: '/login'}), loginSuccess);

loginSuccess does nothing at the moment.

This is the full error I get:
XMLHttpRequest cannot load https://api.twitter.com/oauth/authenticate?oauth_token=fGVctgAAAAAA1y22AAABXah3t3o. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:3000' is therefore not allowed access.

I'm proxying requests from the react frontend (localhost:3000) to localhost:8080.

If I go into the network tab of the chrome devtools and select the response from the twitter api it looks like this:

If anyone knows how to get passport-twitter authentication to work with this kind of setup please let me know.

Answer 1

Sad news, Twitter won't let you to call its API client-side, you need a server in order to do that :(

Take a look at this Quora answer .