I\'m trying to run jQuery\'s $.get after having a user log in with the G+ API with javascript, but am getting a 401 ( unauthorised ) error in the browser console.
Here i
Each request to the Gmail API requires an access token, so an API key will not be enough.
While the user may have logged in with the G+ API that does not by itself give your app authorized access to the user's Gmail.
Check here for more details on getting access to the Gmail API: https://developers.google.com/gmail/api/overview#auth_and_the_gmail_api