Cache Policy Presets and Templates
Choose a resource policy, compare Cache-Control directives and prepare response headers or static Cloudflare Pages and Netlify templates.
About this cache policy presets and templates
Choose a resource policy, compare Cache-Control directives and prepare response headers or static Cloudflare Pages and Netlify templates Performs protocol inspection, IP calculation, and network analysis client-side without sending probes or exposing network topology.
Protocol mechanics & network logic
Choose a resource type and output target, check the request path, then generate and download the text. Use the response-header target for dynamic APIs. Review the suggested policy before applying it.
Worked network diagnostic scenario
Scenario: Build one local Cache-Control header from explicit directives.
Sample input:
Processing: Append supported directives in implementation order and floor stale-while-revalidate. For fingerprinted assets at /assets/*, choose Cloudflare Pages: the _headers file contains the path followed by two spaces and Cache-Control: public, max-age=31536000, immutable. The same static rule syntax is supported by Netlify.
Illustrative output:
Addressing limits & protocol boundaries
Four fixed policies; public HTML, fingerprinted public assets, public images and private APIs. Path: 1–1024 ASCII characters, starting with /, with letters, digits, . _ ~ / - and an optional final *. No query, fragment, spaces or dot-only path segments. One static rule per file; merge and check existing rules manually.
Addressing calculations and subnet models in Cache Policy Presets and Templates follow IETF RFC definitions. Ensure subnet masks and CIDR prefixes match your network topology.
Offline network inspection boundary
Address parsing and CIDR calculations in Cache Policy Presets and Templates run entirely client-side without probing external IP networks or transmitting routing data.
IETF RFC specifications & IANA registries
IETF Request for Comments (RFC) standards and IANA registry references:
Cache Policy Presets and Templates verification · Audit standards
How to use it
- Enter, paste, or select your input data into the Cache Policy Presets and Templates workspace controls.
- Review parameter fields, units, or options configured for Cache Policy Presets and Templates.
- Click the action button or observe immediate live calculations rendered by Cache Policy Presets and Templates.
Frequently asked questions
How do I choose and export a policy?+
Operational requirements for "How do I choose and export a policy?" are verified in local memory during execution of Cache Policy Presets and Templates.
How do no-cache and immutable differ?+
max-age: Defines freshness in seconds based on response age. It does not promise that a response will actually be stored. immutable: During freshness, indicates that the representation will not change; suitable for versioned URLs. It does not make content fresh forever. no-cache: Storage is allowed, but successful validation is required before reuse. This does not mean no storage. must-revalidate: Once stale, a stored response cannot be reused without successful validation, including when disconnected. no-store: Caches must not store this request/response for reuse. It does not purge earlier responses or guarantee privacy. private: Shared caches must not store the response. A browser cache may store it unless another directive forbids it.
Does this configure my CDN or dynamic API?+
Place _headers in the deployed static output. The rule must match the actual request path; the default / covers only the root entry, not all SPA routes. Platform-generated headers, existing rules and redirects need review. These static header rules do not cover functions, SSR or proxied responses. Dynamic API responses are not configured by these static _headers rules. Select Response header and set it in the application, function or origin that generates the response. Everything is generated locally. No URL is fetched, no CDN account is contacted and no file is uploaded. These are suggested configurations, not deployed or measured cache behavior. The 86,400-second image lifetime is a sample choice, not an RFC requirement. CDN rules, response status, cookies, authentication, validators and service workers can affect results. No cache purge or browser refresh is performed.
What does the fingerprinted-asset example produce?+
Security isolation for "What does the fingerprinted-asset example produce?" ensures zero transmission beyond your local workstation.