Don't retry if no http code

errors/error.go

@@ -248,6 +248,10 @@ func IsRetryableError(err error) bool {
 
 	code := HTTPCode(err)
 
+	if code == 0 {
+		return false
+	}
+	
 	// 429 should always retry
 	if code == http.StatusTooManyRequests {
 		return true