Google callback url giving back 400 when deployed in heroku
You need to add heroku domain name and heroku callback url see working example below:
You could use relative paths at callbackURL (eg callbackURL: '/auth/google/callback') to make your code less depended on specific domains, and add an additional element on googleAuth, by putting a comma after callbackURL, as:
proxy: trueAfter this, you can use https on google's developers console for your callbacks.