[−][src]Struct headers::IfNoneMatch
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
impl IfNoneMatch
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pub fn any() -> IfNoneMatch
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Create a new If-None-Match: *
header.
pub fn precondition_passes(&self, etag: &ETag) -> bool
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Checks whether the ETag passes this precondition.
Trait Implementations
impl Clone for IfNoneMatch
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fn clone(&self) -> IfNoneMatch
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fn clone_from(&mut self, source: &Self)
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impl Debug for IfNoneMatch
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impl From<ETag> for IfNoneMatch
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fn from(etag: ETag) -> IfNoneMatch
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impl Header for IfNoneMatch
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fn name() -> &'static HeaderName
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fn decode<'i, I>(values: &mut I) -> Result<Self, Error> where
I: Iterator<Item = &'i HeaderValue>,
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I: Iterator<Item = &'i HeaderValue>,
fn encode<E: Extend<HeaderValue>>(&self, values: &mut E)
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impl PartialEq<IfNoneMatch> for IfNoneMatch
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fn eq(&self, other: &IfNoneMatch) -> bool
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fn ne(&self, other: &IfNoneMatch) -> bool
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impl StructuralPartialEq for IfNoneMatch
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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
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> Same<T> for T
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type Output = T
Should always be Self
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,