Magento 2 custom module shortened url with query string goes 404

I have a custom controller page :

http://dev.test/myfrontend/ 

The above works fine. also the bellow one works

http://dev.test/myfrontend/index/index/ 

Now if I add query string:

http://dev.test/myfrontend/index/index/viewid/2 

this loads the page fine and I can get parameters fine

But if I load like the this:

http://dev.test/myfrontend/viewid/2 // It fail Miserably goes 404

This should work without adding /index/index !

Does anyone have nay idea ?

Thanks