diff --git a/openapi/middleware.go b/openapi/middleware.go
index f61eb45e..be41de1a 100644
--- a/openapi/middleware.go
+++ b/openapi/middleware.go
@@ -268,10 +268,12 @@ func (o *Operation) BodyRef(ref string, summary, description web.LocaleStringer)
 //
 // f 如果不为空，则要以对根据 resp 生成的对象做二次修改。
 func (o *Operation) Response(status string, resp any, desc web.LocaleStringer, f func(*Response)) *Operation {
-	r := &Response{
-		Description: desc,
-		Body:        o.d.newSchema(reflect.TypeOf(resp)),
+	r := &Response{Description: desc}
+
+	if resp != nil {
+		r.Body = o.d.newSchema(reflect.TypeOf(resp))
 	}
+
 	if f != nil {
 		f(r)
 	}
diff --git a/openapi/openapi.go b/openapi/openapi.go
index 993e3922..c787e159 100644
--- a/openapi/openapi.go
+++ b/openapi/openapi.go
@@ -45,6 +45,8 @@ const (
 )
 
 const (
+	FormatBinary   = "binary"
+	FormatByte     = "byte"
 	FormatInt32    = "int32"
 	FormatInt64    = "int64"
 	FormatFloat    = "float"