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Caching

Caching

Caching is the core mechanism that makes fast.site fast. It stores copies of your website's responses at our global Edge Servers to serve content instantly.

How caching works

1

Cache MISS (First Request)

fast.site forwards the request to your origin server, returns the response, and stores a copy in memory.

2

Cache HIT (Subsequent Requests)

The cached copy is found and served in under 5ms without contacting your origin server.

3

Expiration

Entries expire based on your origin's Cache-Control headers or rules you define.

Response Headers

fs-cache

Values: HIT, MISS, BYPASS. Indicates if content came from cache or origin.

fs-cache-age

Number of seconds the cached object has been stored at the Edge.

fs-cache-hits

Number of times the cached entry has been served. Useful for spotting hot URLs.

Cache Purging

When your website content changes, manually clear cached copies to force a fresh fetch from your origin.

Purge by URL

https://example.com/about

API Purge

DELETE /my/domains/:id/cache