diff --git a/middleware/wrap_writer.go b/middleware/wrap_writer.go
index bf270881..12d4faf0 100644
--- a/middleware/wrap_writer.go
+++ b/middleware/wrap_writer.go
@@ -81,7 +81,11 @@ type basicWriter struct {
 }
 
 func (b *basicWriter) WriteHeader(code int) {
-	if !b.wroteHeader {
+	if code >= 100 && code <= 199 && code != http.StatusSwitchingProtocols {
+		if !b.discard {
+			b.ResponseWriter.WriteHeader(code)
+		}
+	} else if !b.wroteHeader {
 		b.code = code
 		b.wroteHeader = true
 		if !b.discard {