{ "api_version": "1", "kind": "dse_post", "self": "https://update.dsesecurity.com/api/v1/posts/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache/", "item": { "id": "https://update.dsesecurity.com/updates/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache/", "slug": "do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache", "url": "https://update.dsesecurity.com/updates/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache/", "alternate_urls": { "markdown": "https://update.dsesecurity.com/updates/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache.md", "json": "https://update.dsesecurity.com/api/v1/posts/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache/" }, "title": "Do not use Cloudflare TTL as a promise that an object remains in cache", "summary": "Freshness policy and eviction-driven retention answer different operational questions.", "format": { "slug": "guide", "name": "Guide" }, "priority": { "slug": "info", "name": "Information" }, "featured": false, "image": { "theme": "network-infrastructure", "label": "Networks & infrastructure", "alt": "Resilient network core with engineered blue and gold data paths.", "card_url": "https://update.dsesecurity.com/assets/editorial/network-infrastructure-card.webp?v=1.8.20", "hero_url": "https://update.dsesecurity.com/assets/editorial/network-infrastructure-hero.webp?v=1.8.20", "social_url": "https://update.dsesecurity.com/assets/editorial/network-infrastructure-social-v2.jpg?v=1.8.20", "width": 2400, "height": 1350 }, "topics": [ { "slug": "cybersecurity", "name": "Cybersecurity", "url": "https://update.dsesecurity.com/topic/cybersecurity/" }, { "slug": "networks-infrastructure", "name": "Networks & Infrastructure", "url": "https://update.dsesecurity.com/topic/networks-infrastructure/" } ], "author": { "name": "DSE Security Editorial Team", "url": "https://update.dsesecurity.com/#editorial-team", "type": "Organization" }, "publisher": { "name": "Detection Systems & Engineering", "url": "https://dsesecurity.com/" }, "published_at": "2026-10-20T18:16:35+00:00", "modified_at": "2026-10-20T18:34:36+00:00", "reviewed_on": "2026-10-20", "reading_minutes": 2, "word_count": 251, "potentially_affected": "This concerns Cloudflare CDN cache semantics.", "dse_recommendation": "DSE recommends writing performance and resilience expectations without assuming every object survives for its full TTL.", "primary_source": { "name": "Cloudflare — Retention vs Freshness (TTL)", "url": "https://developers.cloudflare.com/cache/concepts/retention-vs-freshness/", "published_on": null, "authority": "developers.cloudflare.com" }, "publishing_principles": "https://update.dsesecurity.com/updates/dse-updates-editorial-methodology/", "usage_info": "https://update.dsesecurity.com/usage/", "copyright_notice": "Copyright © 2026 Detection Systems & Engineering. All rights reserved.", "content_html": "

Freshness policy and eviction-driven retention answer different operational questions.

\n

Source facts

\n

Cloudflare distinguishes freshness, the period an object can be used without checking its source, from retention, how long it remains stored before eviction. The source describes retention as influenced by popularity and cache capacity and not directly configurable. A fresh object can therefore be absent when requested again, while an expired retained object may need revalidation.

\n

Source: Cloudflare — Retention vs Freshness (TTL).

\n

Applicability

\n

This concerns Cloudflare CDN cache semantics.

\n

DSE recommendation

\n

DSE recommends writing performance and resilience expectations without assuming every object survives for its full TTL. Keep the origin capable of serving a cache miss and size it for a credible miss pattern. Use versioned assets and a deliberate invalidation process for changes. Separate the desired freshness interval from any requirement to preserve data, which needs an appropriate storage and recovery design outside an ordinary CDN cache. Review the origin-capacity plan using a cold-cache scenario, even when the chosen freshness interval is long. Ask the service owner to state where recoverable master content lives and how it is restored. Keep that answer outside the CDN’s freshness and hit-rate objectives.

\n

Verification

\n

Observe representative assets over time with cache status and origin-request evidence. Distinguish an evicted miss from a freshness revalidation instead of treating both as a TTL failure. Test origin behavior under an approved cold-cache workload and record capacity findings without asserting a guaranteed retention period from a configured expiry value.

\n

Official reference

\n

Cloudflare — Retention vs Freshness (TTL). Reviewed October 20, 2026.

", "content_text": "Freshness policy and eviction-driven retention answer different operational questions.\nSource facts\nCloudflare distinguishes freshness, the period an object can be used without checking its source, from retention, how long it remains stored before eviction. The source describes retention as influenced by popularity and cache capacity and not directly configurable. A fresh object can therefore be absent when requested again, while an expired retained object may need revalidation.\nSource: Cloudflare — Retention vs Freshness (TTL).\nApplicability\nThis concerns Cloudflare CDN cache semantics.\nDSE recommendation\nDSE recommends writing performance and resilience expectations without assuming every object survives for its full TTL. Keep the origin capable of serving a cache miss and size it for a credible miss pattern. Use versioned assets and a deliberate invalidation process for changes. Separate the desired freshness interval from any requirement to preserve data, which needs an appropriate storage and recovery design outside an ordinary CDN cache. Review the origin-capacity plan using a cold-cache scenario, even when the chosen freshness interval is long. Ask the service owner to state where recoverable master content lives and how it is restored. Keep that answer outside the CDN’s freshness and hit-rate objectives.\nVerification\nObserve representative assets over time with cache status and origin-request evidence. Distinguish an evicted miss from a freshness revalidation instead of treating both as a TTL failure. Test origin behavior under an approved cold-cache workload and record capacity findings without asserting a guaranteed retention period from a configured expiry value.\nOfficial reference\nCloudflare — Retention vs Freshness (TTL). Reviewed October 20, 2026.", "content_markdown": "Freshness policy and eviction-driven retention answer different operational questions.\n\n## Source facts\n\nCloudflare distinguishes freshness, the period an object can be used without checking its source, from retention, how long it remains stored before eviction. The source describes retention as influenced by popularity and cache capacity and not directly configurable. A fresh object can therefore be absent when requested again, while an expired retained object may need revalidation.\n\nSource: [Cloudflare — Retention vs Freshness (TTL)](https://developers.cloudflare.com/cache/concepts/retention-vs-freshness/).\n\n## Applicability\n\nThis concerns Cloudflare CDN cache semantics.\n\n## DSE recommendation\n\nDSE recommends writing performance and resilience expectations without assuming every object survives for its full TTL. Keep the origin capable of serving a cache miss and size it for a credible miss pattern. Use versioned assets and a deliberate invalidation process for changes. Separate the desired freshness interval from any requirement to preserve data, which needs an appropriate storage and recovery design outside an ordinary CDN cache. Review the origin-capacity plan using a cold-cache scenario, even when the chosen freshness interval is long. Ask the service owner to state where recoverable master content lives and how it is restored. Keep that answer outside the CDN’s freshness and hit-rate objectives.\n\n## Verification\n\nObserve representative assets over time with cache status and origin-request evidence. Distinguish an evicted miss from a freshness revalidation instead of treating both as a TTL failure. Test origin behavior under an approved cold-cache workload and record capacity findings without asserting a guaranteed retention period from a configured expiry value.\n\n## Official reference\n\n[Cloudflare — Retention vs Freshness (TTL)](https://developers.cloudflare.com/cache/concepts/retention-vs-freshness/). Reviewed October 20, 2026." }, "json_ld": { "@context": "https://schema.org", "@graph": [ { "@type": "Organization", "@id": "https://dsesecurity.com/#organization", "name": "Detection Systems & Engineering", "alternateName": "DSE Security", "url": "https://dsesecurity.com/", "logo": { "@type": "ImageObject", "url": "https://update.dsesecurity.com/assets/dse-logo-20260812.png?v=1.8.20" } }, { "@type": "Organization", "@id": "https://update.dsesecurity.com/#editorial-team", "name": "DSE Security Editorial Team", "url": "https://update.dsesecurity.com/", "parentOrganization": { "@id": "https://dsesecurity.com/#organization" } }, { "@type": "WebSite", "@id": "https://update.dsesecurity.com/#website", "name": "DSE Updates", "alternateName": "DSE Security Knowledge Hub", "url": "https://update.dsesecurity.com/", "inLanguage": "en-US", "publisher": { "@id": "https://dsesecurity.com/#organization" }, "potentialAction": { "@type": "SearchAction", "target": { "@type": "EntryPoint", "urlTemplate": "https://update.dsesecurity.com/?q={search_term_string}" }, "query-input": "required name=search_term_string" } }, { "@type": "WebPage", "@id": "https://update.dsesecurity.com/updates/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache/", "url": "https://update.dsesecurity.com/updates/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache/", "isPartOf": { "@id": "https://update.dsesecurity.com/#website" }, "lastReviewed": "2026-10-20" }, { "@type": "BreadcrumbList", "@id": "https://update.dsesecurity.com/updates/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache/#breadcrumbs", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "DSE Updates", "item": "https://update.dsesecurity.com/" }, { "@type": "ListItem", "position": 2, "name": "Cybersecurity", "item": "https://update.dsesecurity.com/topic/cybersecurity/" }, { "@type": "ListItem", "position": 3, "name": "Do not use Cloudflare TTL as a promise that an object remains in cache", "item": "https://update.dsesecurity.com/updates/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache/" } ] }, { "@type": [ "Article", "TechArticle" ], "@id": "https://update.dsesecurity.com/updates/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache/#article", "identifier": "https://update.dsesecurity.com/updates/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache/", "url": "https://update.dsesecurity.com/updates/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache/", "headline": "Do not use Cloudflare TTL as a promise that an object remains in cache", "description": "Freshness policy and eviction-driven retention answer different operational questions.", "abstract": "Freshness policy and eviction-driven retention answer different operational questions.", "articleBody": "Freshness policy and eviction-driven retention answer different operational questions.\nSource facts\nCloudflare distinguishes freshness, the period an object can be used without checking its source, from retention, how long it remains stored before eviction. The source describes retention as influenced by popularity and cache capacity and not directly configurable. A fresh object can therefore be absent when requested again, while an expired retained object may need revalidation.\nSource: Cloudflare — Retention vs Freshness (TTL).\nApplicability\nThis concerns Cloudflare CDN cache semantics.\nDSE recommendation\nDSE recommends writing performance and resilience expectations without assuming every object survives for its full TTL. Keep the origin capable of serving a cache miss and size it for a credible miss pattern. Use versioned assets and a deliberate invalidation process for changes. Separate the desired freshness interval from any requirement to preserve data, which needs an appropriate storage and recovery design outside an ordinary CDN cache. Review the origin-capacity plan using a cold-cache scenario, even when the chosen freshness interval is long. Ask the service owner to state where recoverable master content lives and how it is restored. Keep that answer outside the CDN’s freshness and hit-rate objectives.\nVerification\nObserve representative assets over time with cache status and origin-request evidence. Distinguish an evicted miss from a freshness revalidation instead of treating both as a TTL failure. Test origin behavior under an approved cold-cache workload and record capacity findings without asserting a guaranteed retention period from a configured expiry value.\nOfficial reference\nCloudflare — Retention vs Freshness (TTL). Reviewed October 20, 2026.", "datePublished": "2026-10-20T18:16:35+00:00", "dateModified": "2026-10-20T18:34:36+00:00", "mainEntityOfPage": { "@id": "https://update.dsesecurity.com/updates/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache/" }, "inLanguage": "en-US", "isAccessibleForFree": true, "author": { "@type": "Organization", "name": "DSE Security Editorial Team", "url": "https://update.dsesecurity.com/#editorial-team" }, "publisher": { "@id": "https://dsesecurity.com/#organization" }, "image": { "@type": "ImageObject", "@id": "https://update.dsesecurity.com/updates/do-not-use-cloudflare-ttl-as-a-promise-that-an-object-remains-in-cache/#primaryimage", "url": "https://update.dsesecurity.com/assets/editorial/network-infrastructure-social-v2.jpg?v=1.8.20", "contentUrl": "https://update.dsesecurity.com/assets/editorial/network-infrastructure-social-v2.jpg?v=1.8.20", "width": 1200, "height": 630, "caption": "Do not use Cloudflare TTL as a promise that an object remains in cache" }, "articleSection": [ "Cybersecurity", "Networks & Infrastructure" ], "keywords": [ "Cybersecurity", "Networks & Infrastructure", "Guide", "Information priority" ], "genre": "Guide", "about": [ { "@type": "Thing", "name": "Cybersecurity", "url": "https://update.dsesecurity.com/topic/cybersecurity/" }, { "@type": "Thing", "name": "Networks & Infrastructure", "url": "https://update.dsesecurity.com/topic/networks-infrastructure/" } ], "wordCount": 251, "timeRequired": "PT2M", "publishingPrinciples": "https://update.dsesecurity.com/updates/dse-updates-editorial-methodology/", "usageInfo": "https://update.dsesecurity.com/usage/", "copyrightHolder": { "@id": "https://dsesecurity.com/#organization" }, "copyrightNotice": "Copyright © 2026 Detection Systems & Engineering. All rights reserved.", "citation": { "@type": "CreativeWork", "name": "Cloudflare — Retention vs Freshness (TTL)", "url": "https://developers.cloudflare.com/cache/concepts/retention-vs-freshness/" } } ] } }