Type Alias SubjectResolver 

pub type SubjectResolver = Arc<dyn Fn(&HeaderMap) -> Option<String> + Send + Sync>;

Available on crate feature http only.

How the host names the authenticated resource owner for the interactive endpoints.

The HeaderMap is the request’s, so a host can read its own session cookie or a reverse-proxy assertion header. None means “nobody is logged in”, which is a refusal, not an error: see ServiceBuilder::with_subject_resolver.

Aliased Type

pub struct SubjectResolver { /* private fields */ }