urlp = easy:GetInfo_Redirect_URL()
#CURLOPT_FOLLOWLOCATION
. This can come
very handy if you think using the built-in libcurl redirect logic isn't good
enough for you but you would still prefer to avoid implementing all the magic
of figuring out the new URL.
This URL is also get if the #CURLOPT_MAXREDIRS
limit prevented a
redirect to happen (since 7.54.1).