The Pragma
header defined by HTTP/1.0.
The "Pragma" header field allows backwards compatibility with
HTTP/1.0 caches, so that clients can specify a "no-cache" request
that they will understand (as Cache-Control was not defined until
HTTP/1.1). When the Cache-Control header field is also present and
understood in a request, Pragma is ignored.
In HTTP/1.0, Pragma was defined as an extensible field for
implementation-specified directives for recipients. This
specification deprecates such extensions to improve interoperability.
Spec: https://tools.ietf.org/html/rfc7234#section-5.4
use headers::Pragma;
let pragma = Pragma::no_cache();
Construct the literal no-cache
Pragma header.
Return whether this pragma is no-cache
.
Performs copy-assignment from source
. Read more
Formats the value using the given formatter. Read more
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.