InvalidRouteException with GET parameters

Yii 2.0 General Discussions
1

How can I process request like http://localhost/mysite/web/index.php?r=site/auth?authclient=somerestapi?code=xxxxx
in SiteController?
I am trying to login to 3rd party rest api with OAuth2Client.
I am getting yii\base\InvalidRouteException: Unable to resolve the request: site/auth?authclient=somerestapi?code=xxxxx

in

 class Controller extends Component implements ViewContextInterface
public function runAction($id, $params = []){
//$id="auth?authclient=somerestapi?code=xxxxxx" is here

Is it possible to have a generic action in SiteController? Currently I have

public function actionAuth($authclient){
...
}

why I can’t have

public function actionAuth()

to catch site/auth with any GET parameters?

2

Is it possible to have a generic action in SiteController?

Yes. Definitely. You can have public function actionAuth() without any parameters and obtain parameters from request instead.

3

Problem was I receive an http request with two “?” as above from that OAuth server I am trying to authenticate to.
It took me 2+ days to see that.