Constant actix_web::http::header::PRAGMA

pub const PRAGMA: HeaderName = HeaderName{inner: Repr::Standard(StandardHeader::Pragma),}

HTTP/1.0 header usually used for backwards compatibility.

The Pragma HTTP/1.0 general header is an implementation-specific header that may have various effects along the request-response chain. It is used for backwards compatibility with HTTP/1.0 caches where the Cache-Control HTTP/1.1 header is not yet present.