@Override
            public CompletionStage<RetryDecision> shouldRetry(ClientRequestContext ctx,
                                                              @Nullable Throwable cause) {
                return ruleFilter.apply(ctx, cause) ? decisionFuture : NEXT_DECISION;
            }
Returns a newly created {@link RetryRule} that never retries.
core/src/main/java/com/linecorp/armeria/client/retry/RetryRuleBuilder.java