static <T extends Response> RetryRuleWithContent<T> onStatusClass(HttpStatusClass statusClass) {
        return onStatusClass(statusClass, Backoff.ofDefault());
    }
Returns a newly created {@link RetryRuleWithContent} that will retry with the
{@linkplain Backoff#ofDefault() default backoff} if the class of the response status is the specified
{@link HttpStatusClass}.
core/src/main/java/com/linecorp/armeria/client/retry/RetryRuleWithContent.java