boolean shouldSendNotModifiedResponse(final HttpRequest request, final HttpCacheEntry responseEntry, final Instant now) {
        return suitabilityChecker.isConditional(request)
                && suitabilityChecker.allConditionalsMatch(request, responseEntry, now);
    }
Reports the number of times that the cache was able to satisfy
a response by revalidating an existing but stale cache entry.
@return the number of cache revalidations
httpclient5-cache/src/main/java/org/apache/hc/client5/http/impl/cache/CachingExecBase.java