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.
If-None-Match = "*" / 1#entity-tag
"xyzzy"
W/"xyzzy"
"xyzzy", "r2d2xxxx", "c3piozzzz"
W/"xyzzy", W/"r2d2xxxx", W/"c3piozzzz"
*
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()),
])
);
Only the listed items are a match
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 !=
.
Returns the name of the header field this belongs to. Read more
Parse a header from a raw stream of bytes. Read more
Format a header to be output into a TcpStream. Read more
Formats the value using the given formatter. Read more