Android Browser Smartproxy Integration

I already have the full source code of my custom Android browser app.
Now I want to integrate a VPS-based smart proxy system inside it.

Here’s how it should work:

When a user opens any website from the browser, the system will first check whether the website is blocked in the user’s country (for example, using DNS or HTTP response check).

If the website is not blocked, it will load normally (no proxy).
If the website is blocked or restricted, then the browser should automatically activate the proxy (connected to my VPS) and load the website through that proxy.

I will provide:

My existing browser app source code

VPS details (to be used as proxy server)

You need to:

Configure the VPS as a proxy (secure & fast)

Integrate proxy logic into the browser app

Ensure automatic detection and smooth switching between normal and proxy modes

Keep the app lightweight and efficient