how to change an applicationu00B4s URL for language ??

Hello,

I´m using runtime->construct_bsp_url in the INIT method of my main class for determining the URL of my application, which in time delivers:

https://sap19230.os.fth.sbs.de/sap/bc/bsp/sap/it00/test.htm

and I want to add the aggregate for the logon language like

https://sap19230.os.fth.sbs.de/sap/bc/bsp/sap/it00/test.htm?sap-sessioncmd=open&sap-client=090&sap-language=DE

the question here is how I´m gonna set the new URL ??

thanks !!