//! HTTP cache layer. ETag-based revalidation with separate browser and CDN
//! directives (RFC 9213). Three concepts, one file each:
//!
//! - [`CacheStrategy`] — *what kind of resource* the handler is returning
//! (input enum picked by the route).
//! - [`CacheParams`] — the *resolved* etag + Cache-Control + CDN-Cache-Control,
//! derived from a strategy plus current chain tip.
//! - [`CdnCacheMode`] — operator-level toggle for the CDN cached tier
//! (process-global, set once via [`init`] from `Server::new`).
pub use CdnCacheMode;
pub use CacheParams;
pub use CacheStrategy;
pub use init;