added real_ip and cloudflare_real_ip middlewares, fixed that some middlewares does not work properly

internal/error/builder.go

@@ -50,7 +50,7 @@ func (b Builder) Build() NestedError {
 	if len(b.errors) == 0 {
 		return nil
 	} else if len(b.errors) == 1 {
-		return b.errors[0]
+		return b.errors[0].Subjectf("%s", b.message)
 	}
 	return Join(b.message, b.errors...)
 }