When should the OAuth web flow be used for a Canvas app?

The choice that indicates when the OAuth web flow should be used for a Canvas app focuses on the preference of the company managing the OAuth process. The OAuth web flow provides a secure way for applications to access resources on behalf of users without sharing their credentials. When a company opts to manage OAuth, it implies that they want to ensure proper governance over the authentication process, enabling them to set specific policies, handle user permissions, and maintain control over the security protocol being used.

Utilizing the OAuth web flow allows for a more standardized authentication mechanism, especially in scenarios involving third-party applications or services. This flow usually includes redirecting users to an authorization server, where they authenticate and grant permission before being redirected back to the Canvas app with appropriate access tokens.

The other options do not align with the specific use case for the OAuth web flow in the context of a Canvas app. For instance, if an app doesn't require user authentication, OAuth would be unnecessary, as there would be no need to manage user credentials or access permissions. Automatic authentication may also imply other methods that do not account for the full user consent process typically involved in OAuth. Lastly, pre-approving users suggests a different model of access control, where OAuth wouldn't be the appropriate mechanism to enforce such a