Issues with hiding URL in Web.show_document.

Hello,

This is on Forms 10g. Non EBS. I have an inline html that is launching via a web browser using web.show_document.  The issue is that entire URL content with sensitive data shows up in browser address bar. How can I conceal that? I tried with below yellow highlighted region and its not working.

If I simply use web.show_document(url, '_blank')', then the page is loading just fine, but when trying to hide the URL, the browser is not loading at all.

DECLARE
    LC$Output clob;
    LC$Text  clob;

Cursor gttrec is select * from ts_dayrec_gtt;