Enum hyper::header::IfNoneMatch

pub enum IfNoneMatch {
    Any,
    Items(Vec<EntityTag>),
}

If-None-Match header, defined in RFC7232

The If-None-Match header field makes the request method conditional on a recipient cache or origin server either not having any current representation of the target resource, when the field-value is "*", or having a selected representation with an entity-tag that does not match any of those listed in the field-value.

A recipient MUST use the weak comparison function when comparing entity-tags for If-None-Match (Section 2.3.2), since weak entity-tags can be used for cache validation even if there have been changes to the representation data.

ABNF

If-None-Match = "*" / 1#entity-tag

Example values

• "xyzzy"
• W/"xyzzy"
• "xyzzy", "r2d2xxxx", "c3piozzzz"
• W/"xyzzy", W/"r2d2xxxx", W/"c3piozzzz"
• *

Examples

use hyper::header::{Headers, IfNoneMatch};

let mut headers = Headers::new();
headers.set(IfNoneMatch::Any);

use hyper::header::{Headers, IfNoneMatch, EntityTag};

let mut headers = Headers::new();
headers.set(
    IfNoneMatch::Items(vec![
        EntityTag::new(false, "xyzzy".to_owned()),
        EntityTag::new(false, "foobar".to_owned()),
        EntityTag::new(false, "bazquux".to_owned()),
    ])
);

Variants

Any

Any value is a match

Items(Vec<EntityTag>)

Only the listed items are a match