Cordova is not available when opening another URL

[alexkoy]

Hello,

I am creating an App with Ionic and Capacitor, using also some Cordova Plugins.
In our old App (only Cordova, no Capacitor) we had an own implemented mechanism: We put the web-part of the application on a server to deliver it. When starting the App, we check on the server if we have the correct version.
If we are on an old version, we redirect (via window.location.replace) to the web-part which is included on the server.
Therefore we used the "www"-directory from the generated folder in platforms/android/app/src/main/assets.
Everything works great. We are always having the correct web-part and can use the Cordova-Hardware-Plugins.

In the new App with Capacitor, I wanted to use the same mechanism. I also put the folder android/app/src/main/assets/public/ on the server and open the server-url, if we have an old version. This also works in browsers without any problems. But when I use an Android-Device, I can not access the Cordova-Hardware-Plugins. I am getting "cordova is not available", even if I am still in the Capacitor-Cordova-App. I just redirect from http://localhost to the server-url. The same problem occurs, if I try remote debugging with "ionic serve".

Does anybody have a suggestion how to solve this?