checking whether the field location_uri.host is nil

lib/vagrant/util/downloader.rb

@@ -107,8 +107,10 @@ module Vagrant
               if progress_data.include?("Location")
                 location = progress_data.scan(/Location: (.+?)$/m).flatten.compact.first.to_s.strip
                 if !location.empty?
-                  @logger.info("download redirected to #{location}")
                   location_uri = URI.parse(location)
+
+                  unless location_uri.host.nil?
+                    @logger.info("download redirected to #{location}")
                     source_uri = URI.parse(source)
                     source_host = source_uri.host.split(".", 2).last
                     location_host = location_uri.host.split(".", 2).last
@@ -118,6 +120,7 @@ module Vagrant
                     end
                     @redirect_notify = true
                   end
+                end
                 progress_data.replace("")
                 break
               end