if {![file exists $file]} {
			set tmpfile "${file}.new"

			set fd [open $tmpfile "w"]
			fconfigure $fd -translation binary

			catch {
			set token [::http::geturl $url -channel $fd -binary true]
			set ncode [::http::ncode $token]
			::http::reset $token
				set token [::http::geturl $url -channel $fd -binary true]
			}

			if {[info exists token]} {
				set ncode [::http::ncode $token]
				::http::reset $token
			} else {
				set ncode "900"
			}

			close $fd

			if {$keyIsHash} {
				catch {
					set hash [string tolower [exec openssl sha1 $tmpfile]]
					regsub {.*= *} $hash {} hash
				}