Re-add --server-response in order to give user nice output

upkg.sh

@@ -502,7 +502,7 @@ upkg_fetch() {
   local url="$1" dest="$2" out
   processing "Downloading %s" "$url"
   if type wget >/dev/null 2>&1; then
-    wget -qO "$dest" "$url" || fatal "Error while downloading '%s'" "$url"
+    out=$(wget --server-response -qO "$dest" "$url" 2>&1) || fatal "Error while downloading '%s', server response:\n%s" "$url" "$out"
   elif type curl >/dev/null 2>&1; then
     curl -fsLo "$dest" "$url" || fatal "Error while downloading '%s'" "$url"
   else