gzip: Fix to allow wildcard extension

config/setup/gzip.go

@@ -43,7 +43,7 @@ func gzipParse(c *Controller) ([]gzip.Config, error) {
 					return configs, c.ArgErr()
 				}
 				for _, e := range exts {
-					if !strings.HasPrefix(e, ".") {
+					if !strings.HasPrefix(e, ".") && e != "*" {
 						return configs, fmt.Errorf(`gzip: invalid extension "%v" (must start with dot)`, e)
 					}
 					extFilter.Exts.Add(e)