Khor

For a backend agnostic Google oauth2 solution, we can use a front-end based (javascript) snippet on the html page, which uses oauth.io. See https://coderwall.com/p/7dixyg/javascript-google-social-login-button-for-oauth

May save a lot of hassle of worrying about the nitty-gritty if you use oauth.io as described here: https://coderwall.com/p/7dixyg/javascript-google-social-login-button-for-oauth