Workflow: cache invalidation strategy for deploys
# Workflow: cache invalidation for deploys
## 1. Tag responses at the origin
Have the origin (or Worker) emit `Cache-Tag` headers: by content type, by section, by deploy id. Tags are the addressing system for surgical purges later.
## 2. Version asset URLs
Fingerprint static assets (`/app.a1b2c3.js`). A new deploy is new URLs: no purge needed for assets at all, and browser caches become an ally instead of a problem.
## 3. Separate the TTLs
Long edge TTL for versioned assets; short edge TTL (or DYNAMIC) for HTML; deliberate browser TTLs. A long browser TTL on HTML means a bad deploy is cached in users' browsers where no purge can reach it.
## 4. Purge by tag on release
The deploy pipeline purges the tags for changed content. Verify with `CF-Cache-Status`: expect MISS then HIT on the purged URLs.
## 5. Emergency: purge everything
Reserved for cache poisoning or a bad deploy cached everywhere. Expect an origin traffic spike as the cache refills; warn whoever owns the origin first.
## What goes wrong
- Purging everything on every deploy "to be safe": defeats the cache and hides the missing tag design.
- Purging the edge while the origin still serves the old file: the edge re-caches the old file. Verify the origin first.
- Forgetting query strings in the cache key: purged `/page` while users get `/page?utm=...` from cache.
## Checklist
- Tags designed day one, versioned URLs for assets, purge by tag per deploy.
- Two-request verification (MISS then HIT) in the deploy pipeline.Find related guidance
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