# Build Github URL to OAuth service.
	fun build_auth_redirect: String do
		var url = "{auth_url}?client_id={client_id}&allow_signup={allow_signup}"
		var redirect_uri = self.redirect_uri
		if redirect_uri != null then url = "{url}&redirect_uri={redirect_uri}"
		var scope = self.scope
		if scope != null then url = "{url}&scope={scope}"
		var state = self.state
		if state != null then url = "{url}&state={state}"
		return url
	end