Using AuthToken obtained via ScriptApp.getAuthToken() to call web apps in GAS

Question

I created 2 simple standalone scripts to test the authorization workflow. The first script is a web app that is accessible only to me.

function doGet(e) {

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Answer 1

If you are still looking for this answer, how about this answer? I think that when the scopes are installed by Manifests, you can access the Web Apps using the access token with the scopes.

Deploy Web Apps :

The condition for deploying Web Apps is as follows.

• On script editor on the project with doGet().
  • Publish -> Deploy as web app
  • For "Execute the app as:", set "Me".
  • For "Who has access to the app:", set "Only myself".

At above condition, when "headers": {"Authorization":"Bearer " + token} is not used for option, the error occurs. So in order to access to Web Apps with above condition, please add the following 2 scopes. In your case, the following scopes are required to authorize.

https://www.googleapis.com/auth/drive
https://www.googleapis.com/auth/script.external_request

In your case, the above 2 scopes are required. In the case of only https://www.googleapis.com/auth/script.external_request, the error of Unauthorized occurs.

Add scopes to Manifests :

Please install above scopes to Manifests (appsscript.json) as follows.

• On script editor on the project with call().
  • View -> Show manifest file
  • Please add the following oauthScopes to appsscript.json.
    • "oauthScopes": ["https://www.googleapis.com/auth/script.external_request", "https://www.googleapis.com/auth/drive"]

Response :

After it installed above, please try to run your call() again. In my environment, I retrieved the following response.

200.0
{"message":"works!"}

If I misunderstand your question, I'm sorry.