I am trying to figure out how to authenticate a desktop app to my App Engine app in order to send HTTP requests to my App Engine App. I have read all the documentation I can find but what I really need to know is, how do I feed my service account key info into my http request so that my App Engine app will respond? Right now I am getting an error stating there are no credentials.Thanks
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Can you share the full stack trace you receive when trying to authenticate? It might help clarify the problem. The Google Auth API reference shows that you can use the "AuthorizedSession" class to create an authenticated session and then use the respective methods to perform HTTP requests from the authenticated session object.
Have you tried it that way? AuthorizedSession expects a Credentials argument, which is returned from the fetch_id_token() method. You can refer to the complete user guide documentation for more samples.