Sets auth_callback as an authentication-handling callback for this.
Whenever a request comes in to this which cannot be authenticated via a domain-specific auth callback (eg, AuthDomainDigestAuthCallback), the generic auth callback will be invoked. See AuthDomainGenericAuthCallback for information on what the callback should do.
| this | |
| auth_callback |
the auth callback |
| auth_data |
data to pass to |
| dnotify |
destroy notifier to free |