Struct poem::web::headers::IfNoneMatch
source · 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
sourceimpl IfNoneMatch
impl IfNoneMatch
sourcepub fn any() -> IfNoneMatch
pub fn any() -> IfNoneMatch
Create a new If-None-Match: *
header.
sourcepub fn precondition_passes(&self, etag: &ETag) -> bool
pub fn precondition_passes(&self, etag: &ETag) -> bool
Checks whether the ETag passes this precondition.
Trait Implementations
sourceimpl Clone for IfNoneMatch
impl Clone for IfNoneMatch
sourcefn clone(&self) -> IfNoneMatch
fn clone(&self) -> IfNoneMatch
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresourceimpl Debug for IfNoneMatch
impl Debug for IfNoneMatch
sourceimpl From<ETag> for IfNoneMatch
impl From<ETag> for IfNoneMatch
sourcefn from(etag: ETag) -> IfNoneMatch
fn from(etag: ETag) -> IfNoneMatch
Converts to this type from the input type.
sourceimpl Header for IfNoneMatch
impl Header for IfNoneMatch
sourcefn name() -> &'static HeaderName
fn name() -> &'static HeaderName
The name of this header.
sourcefn decode<'i, I>(values: &mut I) -> Result<IfNoneMatch, Error>where
I: Iterator<Item = &'i HeaderValue>,
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.sourceimpl PartialEq<IfNoneMatch> for IfNoneMatch
impl PartialEq<IfNoneMatch> for IfNoneMatch
sourcefn eq(&self, other: &IfNoneMatch) -> bool
fn eq(&self, other: &IfNoneMatch) -> bool
impl StructuralPartialEq for IfNoneMatch
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
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more