Network.OAuth2.AuthorizationRequest

Authorization Code Grant Error Responses https://tools.ietf.org/html/rfc6749#section-4.1.2.1

I found it hard to figure out a way to test the authorization error flow. When anything goes wrong in an /authorize request, it gets stuck at the provider page, hence no way for this library to parse error response. In other words, /authorize ends up with 4xx or 5xx. Revisit this whenever you find a case where an OAuth2 provider redirects back to the relying party with errors.

See authorizationUrlWithParams

Prepare the authorization URL. Redirect to this URL asking for user interactive authentication.