How to Escape mailto text

hello,

we have a LinkToURL element, wherein we have the following reference:

mailto:x@y.com?subject=PO Number:4500000010 Material Number:00001

of course this doesnt work because it needs to be escaped to the following:

mailto:x@y.com?subject=PO%20Number:4500000010%20Material%20Number:00001

how does one do the escaping in WebDynpro ? We couldnt find a relevant method in backend ABAP (the cl_http_utility) methods do not escape the string.

thanks and regards,

parag.