Type Alias KeyExtractor 

pub type KeyExtractor = Arc<dyn Fn(&HeaderMap, &Extensions) -> String + Send + Sync>;

Available on crate feature tower only.

Custom, non-IP key extractor for callers that key requests by something other than client IP (API key, tenant id, …). Receives the request’s headers and extensions; returns the rate-limit key.

Overrides client-IP identity entirely: forwarded headers are never consulted.

Aliased Type

pub struct KeyExtractor { /* private fields */ }