can't clear WinHTTP variables from memory

[akuguti]

hi brother,
How to clean variable from WinHttp api?

I use codecave to call winhttp api but I want to hide the url. I have called RtlZeroMemory but the url is still visible...

Can Variables be cleared with kernel32.RtlZeroMemory? Can kernel32.RtlZeroMemory be called from user mode?

I have no idea to clean up memory from codecave.

thanks in advance,