diff --git a/resopnse.go b/resopnse.go
index b75a601..90b6f24 100644
--- a/resopnse.go
+++ b/resopnse.go
@@ -93,7 +93,7 @@ func (r *Response) GetHeaders() map[string][]string {
 func (r *Response) GetHeader(name string) []string {
 	headers := r.GetHeaders()
 	for k, v := range headers {
-		if strings.ToLower(name) == strings.ToLower(k) {
+		if strings.EqualFold(name, k) {
 			return v
 		}
 	}