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use util::{FlatCsv}; use super::ETag; use {HeaderValue}; /// `If-None-Match` header, defined in /// [RFC7232](https://tools.ietf.org/html/rfc7232#section-3.2) /// /// 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 /// /// ```text /// If-None-Match = "*" / 1#entity-tag /// ``` /// /// # Example values /// /// * `"xyzzy"` /// * `W/"xyzzy"` /// * `"xyzzy", "r2d2xxxx", "c3piozzzz"` /// * `W/"xyzzy", W/"r2d2xxxx", W/"c3piozzzz"` /// * `*` /// /// # Examples /// /// ``` /// # extern crate headers_ext as headers; /// use headers::IfNoneMatch; /// /// let if_none_match = IfNoneMatch::any(); /// ``` #[derive(Clone, Debug, PartialEq, Header)] pub struct IfNoneMatch(FlatCsv); impl IfNoneMatch { /// Create a new `If-None-Match: *` header. pub fn any() -> IfNoneMatch { IfNoneMatch(HeaderValue::from_static("*").into()) } } impl From<ETag> for IfNoneMatch { fn from(etag: ETag) -> IfNoneMatch { IfNoneMatch(HeaderValue::from(etag.0).into()) } } /* test_if_none_match { test_header!(test1, vec![b"\"xyzzy\""]); test_header!(test2, vec![b"W/\"xyzzy\""]); test_header!(test3, vec![b"\"xyzzy\", \"r2d2xxxx\", \"c3piozzzz\""]); test_header!(test4, vec![b"W/\"xyzzy\", W/\"r2d2xxxx\", W/\"c3piozzzz\""]); test_header!(test5, vec![b"*"]); } */ /* #[cfg(test)] mod tests { use super::IfNoneMatch; use Header; use EntityTag; #[test] fn test_if_none_match() { let mut if_none_match: ::Result<IfNoneMatch>; if_none_match = Header::parse_header(&b"*".as_ref().into()); assert_eq!(if_none_match.ok(), Some(IfNoneMatch::Any)); if_none_match = Header::parse_header(&b"\"foobar\", W/\"weak-etag\"".as_ref().into()); let mut entities: Vec<EntityTag> = Vec::new(); let foobar_etag = EntityTag::new(false, "foobar".to_owned()); let weak_etag = EntityTag::new(true, "weak-etag".to_owned()); entities.push(foobar_etag); entities.push(weak_etag); assert_eq!(if_none_match.ok(), Some(IfNoneMatch::Items(entities))); } } */