Howto make App/Browser as Standard App and URL Problem

Hello,
I am currently working on a browser. However, it would be useful if you could set the app as a standard app as a browser.

Is that possible, and if so, how?

In addition, I have one more question, namely:
Since the URL for the browser “http: //” or “https: //” must be in front of whether you can check if this is the case, and if not that then automatically one of these two things is placed in front of the URL.

Is that possible, and if so, how?

Thanks in advance!