CORS issue in twitter signin api

[systems_app]

I am implementing twitter signin in angular5.
To get access token from client side i am following https://developer.twitter.com/en/docs/twitter-for-websites/log-in-with-twitter/guides/implementing-sign-in-with-twitter

I am getting Cross Origin error on accessing twitter apis.

Failed to load https://api.twitter.com/oauth/request_token: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘http://localhost:4200’ is therefore not allowed access. The response had HTTP status code 400.

[CRivasGomez]

Hey @systems_app!

I had have the same problem. You need to interact with Twitter API from another server. The solution is to implement a backend that runs in another server than your Angular app and make it available to your Angular app with a REST API.