How do I get the URL of a jsp page?

Question

I have a jsp page which has a link to a servlet page, in the servlet page, I want to get the URL of the jsp page.
I tried to use request.getHeader("referer"), it seems like if it is a link in the jsp directly lead to the servlet, it works, but if the link calls a javascript function which opens up a window runing the servlet, it is not working. I have to do the second way, so it is not working by doing request.getHeader("referer")
I tried to use javascript "location.href", I get the whole url by alerting the url in the jsp page:
http://localhost:8080/pos-webapp/serv/qt_old?currentpage=portal&bcd=ABC123&pnm=P1001830&prnm=1&psd=236863.0&ln=01&sln=NYPPA&stp=2.1&stt=A&_POSID=1F8464122ADAF4EEC9B1A94C286EB252
then I pass this url when calling with my servlet, in the servlet page, when I do request.getParameter("url"), the url is actually cut off like this:
http://localhost:8080/pos-webapp/serv/qt_old?currentpage=portal
anything after &pnm is cut off, anyone has any idea?
Thanks in advance.

Answer 1

Thank you.
but how do I put encoding in the javascript code? do I need to decode in my servlet page?
here is my code in the jsp page:
linkset[3]+='<div class="menuitems">Email Diagnostics to AutoOne</div>'<%     
function emailDiagnostics()
win = window.open("/pos-webapp/serv/email_diagnostics?url=" + location.href + "&browser=" + navigator.appName, "emailDiagnostics",
"width=350, height=140, resizable=no, scrollbars=no, toolbar=no, location=yes, directories=no, status=no, menubar=no, copyhistory=no, left=450, top=300");
win.focus();
}