How to call WD program from a headerless WD screen

Hi Experts,
For the MSS worklist, I have created a custom WD headerless screen. In this screen, I have created one linktoURL UI element. When the user clicks on the screen, URL is called using following code. This code is working fine in Development. How I can remove the hardcoding related with https://ruepd.mycompany.com:50001. As for Quality the URL will be different say https://abcpd.mycompany.com:50001. Please help.
public static void wdDoModifyView(IPrivateAutoSettlementAppView wdThis, IPrivateAutoSettlementAppView.IContextNode wdContext, com.sap.tc.webdynpro.progmodel.api.IWDView view, boolean firstTime)
    //@@begin wdDoModifyView
    wdContext.currentContextElement().
    setUrl("https://ruepd.mycompany.com:50001/irj/portal?" +
               "NavigationTarget=ROLES%3A%2F%2Fportal_content%2Fcom.mycompany.all.folder.mycompany%2Fcom.mycompany.ep.folder.enterprise_portal%2Fcom.mycompany.portal.folder.roles%2Fcom.mycompany.portal.folder.employee_self_service%2Fcom.mycompany.portal.role.employee_self_service%2Fcom.mycompany.portal.workset.employee_self_service%2Fcom.mycompany.portal.workset.area_travel_expenses%2Fcom.mycompany.portal.page.create_expense_report&DynamicParameter=trip_number%3D"+
            (wdContext.currentContextElement().getTripNumber()).replaceAll("^0*","") +
            "%26mode%3Dcreate&TarTitle=Create%20Expense%20Report");
One alernative is to create a push button and then use the navigate absolute. However navigate absolute code does not work for headerless WD screen.
How I can convert headerless into non - headerless screen. As the screen is being called from Worklist. I does not have any control on making the screen non headerless screen.
The questions are
1) Is there is any way to keep the code as shown above and remove "https://ruepd.mycompany.com:50001" by some variable. So that we can avoid hard coding the value of https://ruepd.mycompany.com:50001
2) How to change the screen from hearless screen to non headerless screen. In this case I will use navigate absolute
3) Can we use navigate absolute in case of headerless screen. FYI - I have checked and found that I can not use it in headerless screen
Regards,
Gary

Hi,
I am using following code:
     String hostName = TaskBinder.getCurrentTask().getProtocolAdapter().getServerName();
     if (hostName.equalsIgnoreCase("development.mycompany.com"))
     wdContext.currentContextElement().
     setUrl("https://ruepd.mycompany.com:50001/irj/portal?" +
                 "NavigationTarget=ROLES%3A%2F%2Fportal_content%2Fcom.mycompany.all.folder.mycompany%2Fcom.mycompany.ep.folder.enterprise_portal%2Fcom.mycompany.portal.folder.roles%2Fcom.mycompany.portal.folder.employee_self_service%2Fcom.mycompany.portal.role.employee_self_service%2Fcom.mycompany.portal.workset.employee_self_service%2Fcom.mycompany.portal.workset.area_travel_expenses%2Fcom.mycompany.portal.page.create_expense_report&DynamicParameter=trip_number%3D"+
             (wdContext.currentContextElement().getTripNumber()).replaceAll("^0*","") +
               "%26mode%3Dcreate&TarTitle=Create%20Expense%20Report");
     if (hostName.equalsIgnoreCase("quality.mycompany.com"))
     wdContext.currentContextElement().
     setUrl("https://ruepd.mycompany.com:50001/irj/portal?" +
                 "NavigationTarget=ROLES%3A%2F%2Fportal_content%2Fcom.mycompany.all.folder.mycompany%2Fcom.mycompany.ep.folder.enterprise_portal%2Fcom.mycompany.portal.folder.roles%2Fcom.mycompany.portal.folder.employee_self_service%2Fcom.mycompany.portal.role.employee_self_service%2Fcom.mycompany.portal.workset.employee_self_service%2Fcom.mycompany.portal.workset.area_travel_expenses%2Fcom.mycompany.portal.page.create_expense_report&DynamicParameter=trip_number%3D"+
             (wdContext.currentContextElement().getTripNumber()).replaceAll("^0*","") +
               "%26mode%3Dcreate&TarTitle=Create%20Expense%20Report");
Is it a correct approach?
Regards,
Gary

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