@Override
    protected Event doExecuteInternal(final RequestContext requestContext) throws Throwable {
        return initialAuthenticationProviderWebflowEventResolver.resolveSingle(requestContext);
    }
This is {@link InitialAuthenticationRequestValidationAction}.

@author Misagh Moayyed
@since 5.0.0
support/cas-server-support-actions-core/src/main/java/org/apereo/cas/web/flow/login/InitialAuthenticationRequestValidationAction.java