Type Alias MetadataProvider 

pub type MetadataProvider = Arc<dyn Fn(&Parts, &Parts) -> Option<Vec<u8>> + Send + Sync>;

A closure that takes http::request::Parts and http::response::Parts and returns optional metadata to store with the cached response. This allows middleware to compute and store additional information alongside cached responses.

Aliased Type

pub struct MetadataProvider { /* private fields */ }