address PR comments

staker/stateless_block_validator.go

@@ -432,7 +432,7 @@ func (v *StatelessBlockValidator) Start(ctx_in context.Context) error {
 	for i, spawner := range v.execSpawners {
 		if err := spawner.Start(ctx_in); err != nil {
 			if u, parseErr := url.Parse(v.config.ValidationServerConfigs[i].URL); parseErr == nil {
-				if u.Scheme == "http" || u.Scheme == "https" {
+				if u.Scheme != "ws" && u.Scheme != "wss" {
 					return fmt.Errorf("validation server's url scheme is unsupported, it should either be ws or wss, url:%s err: %w", v.config.ValidationServerConfigs[i].URL, err)
 				}
 			}