Apps Scripts Oauth2 Authorization Using Gapi From Inside Htmlservice

I'm trying to be OAuth2-authorized by using the gapi library from inside an HtmlService project. I've got my CLIENT_ID from the console and I've set up the 'Authorized Javascript O

Solution 1:

To get the origin you need launch your webapp. Right click and click Inspect. This should open Devtools. Click on the Elements tab. Look for the iframe with the id="sandboxFrame". The source the that iframe in your webapp origin. It will look like:

When you add it to your credentials just add the domain part leaving off the endpoint.

https://n-rilyfaex6q3..iimkn7ufgvlphhi2..l3l73y-0lu-script.googleusercontent.com