Struct viz::prelude::http::headers::IfNoneMatch [−][src]
pub struct IfNoneMatch(_);
Expand description
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 headers::IfNoneMatch;
let if_none_match = IfNoneMatch::any();
Implementations
Create a new If-None-Match: *
header.
Checks whether the ETag passes this precondition.
Trait Implementations
Performs the conversion.
The name of this header.
pub fn decode<'i, I>(values: &mut I) -> Result<IfNoneMatch, Error> where
I: Iterator<Item = &'i HeaderValue>,
pub fn decode<'i, I>(values: &mut I) -> Result<IfNoneMatch, Error> where
I: Iterator<Item = &'i HeaderValue>,
Decode this type from an iterator of HeaderValue
s.
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
This method tests for !=
.
Auto Trait Implementations
impl RefUnwindSafe for IfNoneMatch
impl Send for IfNoneMatch
impl Sync for IfNoneMatch
impl Unpin for IfNoneMatch
impl UnwindSafe for IfNoneMatch
Blanket Implementations
Mutably borrows from an owned value. Read more
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
pub fn vzip(self) -> V
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
where
S: Into<Dispatch>,
impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
fn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
fn with_current_subscriber(self) -> WithDispatch<Self>ⓘNotable traits for WithDispatch<T>impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
impl<T> Future for WithDispatch<T> where
T: Future, type Output = <T as Future>::Output;
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more