diff --git a/sign/pdfsignature.go b/sign/pdfsignature.go
index 216d262..f8c6a57 100644
--- a/sign/pdfsignature.go
+++ b/sign/pdfsignature.go
@@ -404,27 +404,20 @@ func (context *SignContext) GetTSA(sign_content []byte) (timestamp_response []by
 
 	client := &http.Client{}
 	resp, err := client.Do(req)
-	code := 0
-
-	if resp != nil {
-		code = resp.StatusCode
+	if err != nil {
+		return nil, fmt.Errorf("POST %s failed: %w", context.SignData.TSA.URL, err)
 	}
 
-	if err != nil || (code < 200 || code > 299) {
-		if err == nil {
-			defer func() {
-				_ = resp.Body.Close()
-			}()
-			body, _ := io.ReadAll(resp.Body)
-			return nil, errors.New("non success response (" + strconv.Itoa(code) + "): " + string(body))
-		}
+	defer resp.Body.Close()
 
-		return nil, errors.New("non success response (" + strconv.Itoa(code) + ")")
+	if resp.StatusCode < 200 || resp.StatusCode > 299 {
+		body, _ := io.ReadAll(resp.Body)
+		return nil, fmt.Errorf(
+			"TSA returned HTTP %d: %s",
+			resp.StatusCode,
+			string(body),
+		)
 	}
-
-	defer func() {
-		_ = resp.Body.Close()
-	}()
 	timestamp_response_body, err := io.ReadAll(resp.Body)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read response: %w", err)