Replace USERNAME with your own username:

http://proxy.libook.xyz:3128/proxy?user=USERNAME

Example:

http://proxy.libook.xyz:3128/proxy?user=ali123

Chrome / Edge:

Settings → Proxy → Enable “Use setup script”

Paste the link → Save

Firefox:

Settings → Network Settings

Automatic proxy configuration URL

Paste link → OK

iPhone / iPad:

Settings → Wi-Fi → Your network

HTTP Proxy → Automatic

Paste link → Save

Android:

Wi-Fi → Modify network

Proxy → PAC

Paste link → Save

For example: https://link.springer.com. Log in with your previous username and password when prompted.

✅ Done. You are connected.

To change the PDF access, use Ctrl+F5.