Stale-While-Revalidate
Stale-while-revalidate may show an allowed stale cache at once while checking for a fresh response in the background.
Another example
A guide list opens from cache. A quiet check replaces it only when a newer response arrives.
Main parts
- 01Cached response
- 02Allowed stale window
- 03Immediate display
- 04Background validation
- 05Fresh replacement
Use it when
Use it for read-heavy screens where slightly old data is safe for a short, defined time.
Do not use it when
Do not serve stale permissions, payment status, or safety data when being old could cause harm.
Name used in code
stale cache -> serve now + revalidate -> fresh replace Before you ship
Check the runtime and version, integration limits, dependencies and licenses, and platform support. Verify security, failure, speed, monitoring, deploy, support owner, upgrade path, and rollback.
Outcome: Use or review Stale-While-Revalidate as a technical building block that the team can maintain. User context: A guide list opens from cache. A quiet check replaces it only when a newer response arrives. Technology or engineering concept: Stale-While-Revalidate. Why it fits: Use it for read-heavy screens where slightly old data is safe for a short, defined time. Do not use it when: Do not serve stale permissions, payment status, or safety data when being old could cause harm. Engineering fit: Define where it runs and which version to use. Set its job, interfaces, data flow, dependencies, supported systems, security, and speed limits. Explain how it fits the current stack. Lifecycle safeguards: Check dependency health and licenses. Add monitoring and a fallback. Name the upgrade owner. Do not add a second tool for the same job without a measured benefit. Acceptance criteria: A small integration proves the needed behavior. Test compatibility, security, failure, and performance. Document deploy, upgrade, support, and rollback steps. Evidence and limits (evidence boundary): A formal document may still be a draft, release candidate, or final version. Check its status and browser or platform support. Unknowns to confirm: Current stack, runtime and version rules, target systems, dependency owner, performance budget, support period, and migration limits.
Check this request
Review the current use of Stale-While-Revalidate. Definition: Stale-while-revalidate may show an allowed stale cache at once while checking for a fresh response in the background. Release checks: Check the runtime and version, integration limits, dependencies and licenses, and platform support. Verify security, failure, speed, monitoring, deploy, support owner, upgrade path, and rollback. Before changing code, report the evidence you found, gaps, severity, and the smallest safe fix.