static <T extends Response> RetryRuleWithContent<T> onStatusClass(HttpStatusClass... statusClasses) {
        return RetryRuleWithContent.<T>builder().onStatusClass(statusClasses).thenBackoff();
    }
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}es.
core/src/main/java/com/linecorp/armeria/client/retry/RetryRuleWithContent.java