Struct headers::ETag

source ·
pub struct ETag(/* private fields */);
Expand description

ETag header, defined in RFC7232

The ETag header field in a response provides the current entity-tag for the selected representation, as determined at the conclusion of handling the request. An entity-tag is an opaque validator for differentiating between multiple representations of the same resource, regardless of whether those multiple representations are due to resource state changes over time, content negotiation resulting in multiple representations being valid at the same time, or both. An entity-tag consists of an opaque quoted string, possibly prefixed by a weakness indicator.

§ABNF

ETag       = entity-tag

§Example values

  • "xyzzy"
  • W/"xyzzy"
  • ""

§Examples

let etag = "\"xyzzy\"".parse::<headers::ETag>().unwrap();

Trait Implementations§

source§

impl Clone for ETag

source§

fn clone(&self) -> ETag

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
source§

impl Debug for ETag

source§

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
source§

impl From<ETag> for IfMatch

source§

fn from(etag: ETag) -> IfMatch

Converts to this type from the input type.
source§

impl From<ETag> for IfNoneMatch

source§

fn from(etag: ETag) -> IfNoneMatch

Converts to this type from the input type.
source§

impl FromStr for ETag

§

type Err = InvalidETag

The associated error which can be returned from parsing.
source§

fn from_str(src: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type. Read more
source§

impl Header for ETag

source§

fn name() -> &'static HeaderName

The name of this header.
source§

fn decode<'i, I>(values: &mut I) -> Result<Self, Error>
where I: Iterator<Item = &'i HeaderValue>,

Decode this type from an iterator of HeaderValues.
source§

fn encode<E: Extend<HeaderValue>>(&self, values: &mut E)

Encode this type to a HeaderMap. Read more
source§

impl PartialEq for ETag

source§

fn eq(&self, other: &ETag) -> bool

Tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
source§

impl Eq for ETag

source§

impl StructuralPartialEq for ETag

Auto Trait Implementations§

§

impl !Freeze for ETag

§

impl RefUnwindSafe for ETag

§

impl Send for ETag

§

impl Sync for ETag

§

impl Unpin for ETag

§

impl UnwindSafe for ETag

Blanket Implementations§

source§

impl<T> Any for T
where T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> CloneToUninit for T
where T: Clone,

source§

default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for T
where U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T> Same for T

§

type Output = T

Should always be Self
source§

impl<T> ToOwned for T
where T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.