default
The default redirect URI. In app clients with one assigned IdP, replaces redirect_uri in authentication requests. Must be in the CallbackURLs list. A redirect URI must:
Be an absolute URI.
Be registered with the authorization server.
Not include a fragment component. For more information, see Default redirect URI . Amazon Cognito requires HTTPS over HTTP except for http://localhost for testing purposes only. App callback URLs such as myapp://example are also supported.