req-cache.md

cache emits useful debugging info

Code
  # Immutable
  invisible(cache_pre_fetch(req))
Message
  Pruning cache
Code
  invisible(cache_post_fetch(req, resp))
Message
  Saving response to cache "076ab9e79f298c15d4444b2eb6fffa84"
Code
  invisible(cache_pre_fetch(req))
Message
  Found url in cache "076ab9e79f298c15d4444b2eb6fffa84"
  Cached value is fresh; using response from cache

---

Code
  # freshness check
  invisible(cache_pre_fetch(req))
Message
  Pruning cache
  Found url in cache "076ab9e79f298c15d4444b2eb6fffa84"
  Cached value is stale; checking for updates
Code
  invisible(cache_post_fetch(req, response(304)))
Message
  Cached value still ok; retrieving body from cache
Code
  invisible(cache_post_fetch(req, error_cnd()))
Message
  Request errored; retrieving response from cache

can prune by number

Code
  cache_prune(path, list(n = 1, age = Inf, size = Inf), debug = TRUE)
Message
  Deleted 3 files that are too numerous

can prune by age

Code
  cache_prune(path, list(n = Inf, age = 30, size = Inf), debug = TRUE)
Message
  Deleted 1 file that is too old

can prune by size

Code
  cache_prune(path, list(n = Inf, age = Inf, size = 50), debug = TRUE)
Message
  Deleted 2 files that are too big