You're using a feature that people don't seem to be familiar with. Last time someone asked a question about this, it got 0 replies!
I'm not familiar with the PHP server target, so I don't know what this Routes thingy does, but I use NodeJS and never had to use such Route client-side component, we just use this:
I think checking the Internal checkbox is just masking a problem that needs to be fixed in first place.
It seems a tutorial was never written: