Call external URL from Siebel

Hello Experts,

We have a requirement to open an external system by clicking a button in a Siebel applet, we already implemented this requirement by using Siebel Browser Script that calls window.open(OurURL) and it works fine, but we have a security issue in this solution as we pass the username and password in the URL. So the question now is, is there any other way to call the external URL without adding the username and password to the URL, like calling an HTTP request?

Thank You,

Ameen Dehaliah