The Cloud Servers API makes extensive use of caching layers at various tiers of the system. Purging mechanisms exist to ensure that objects served out of cache are accurate and up to date. GETs returning a cached entity return a 203 (Cached) to signal users that the value is being served out of cache. Additionally, cached entities have the following header set:

Table 3.3. Last Modified Header
Header Description
Last-Modified Date and time when the entity was last updated in cache.