How to handle authentication callback in an API backend? Rails API + React Fronetend + Facebook -

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i have rails 5 api backend. have 2 routes such:

  # facebook link url   # /accounts/facebook_url   def facebook_url     @oauth = koala::facebook::oauth.new(       env['facebook_app_id'],       env['facebook_secret'],       facebook_callback_accounts_url     )     # @oauth.url_for_oauth_code # create oauth url     url = @oauth.url_for_oauth_code     render json: url # hanlde using serializer?   end    # facebook post url code   # /accounts/facebook_callback?code=fadsdfaadsf   def facebook_callback     @oauth = koala::facebook::oauth.new(       env['facebook_app_id'],       env['facebook_secret'],       facebook_callback_accounts_url     )     token = @oauth.get_access_token(params[:code])   end

in react app, url authentication facebook_url route , redirect user route. facebook send me token. able point. problem how frontend know token received or not?

if rails application, use different redirects based on status. seems more architecture based question rather rails specific. appreciated.


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