diff --git a/resopnse.go b/resopnse.go
index 11c7e0c..b75a601 100644
--- a/resopnse.go
+++ b/resopnse.go
@@ -115,7 +115,7 @@ func (r *Response) GetHeaderLine(name string) string {
 func (r *Response) HasHeader(name string) bool {
 	headers := r.GetHeaders()
 	for k := range headers {
-		if strings.ToLower(name) == strings.ToLower(k) {
+		if strings.EqualFold(name, k) {
 			return true
 		}
 	}