Struct actix_web::http::header::ETag

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pub struct ETag(pub EntityTag);
Expand description

ETag header, defined in RFC 7232 §2.3

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

use actix_web::HttpResponse;
use actix_web::http::header::{ETag, EntityTag};

let mut builder = HttpResponse::Ok();
builder.insert_header(
    ETag(EntityTag::new_strong("xyzzy".to_owned()))
);
use actix_web::HttpResponse;
use actix_web::http::header::{ETag, EntityTag};

let mut builder = HttpResponse::Ok();
builder.insert_header(
    ETag(EntityTag::new_weak("xyzzy".to_owned()))
);

Tuple Fields§

§0: EntityTag

Methods from Deref<Target = EntityTag>§

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pub fn tag(&self) -> &str

Returns tag.

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pub fn set_tag(&mut self, tag: impl Into<String>)

Sets tag.

Panics

If the tag contains invalid characters.

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pub fn strong_eq(&self, other: &EntityTag) -> bool

For strong comparison two entity-tags are equivalent if both are not weak and their opaque-tags match character-by-character.

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pub fn weak_eq(&self, other: &EntityTag) -> bool

For weak comparison two entity-tags are equivalent if their opaque-tags match character-by-character, regardless of either or both being tagged as “weak”.

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pub fn strong_ne(&self, other: &EntityTag) -> bool

Returns the inverse of strong_eq().

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pub fn weak_ne(&self, other: &EntityTag) -> bool

Returns inverse of weak_eq().

Trait Implementations§

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impl Clone for ETag

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fn clone(&self) -> ETag

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for ETag

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

Formats the value using the given formatter. Read more
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impl Deref for ETag

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type Target = EntityTag

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.
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impl DerefMut for ETag

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fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.
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impl Display for ETag

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

Formats the value using the given formatter. Read more
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impl Header for ETag

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fn name() -> HeaderName

Returns the name of the header field.
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fn parse<M: HttpMessage>(msg: &M) -> Result<Self, ParseError>

Parse the header from a HTTP message.
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impl PartialEq<ETag> for ETag

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

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl TryIntoHeaderValue for ETag

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type Error = InvalidHeaderValue

The type returned in the event of a conversion error.
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fn try_into_value(self) -> Result<HeaderValue, Self::Error>

Try to convert value to a HeaderValue.
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impl Eq for ETag

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impl StructuralEq for ETag

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impl StructuralPartialEq for ETag

Auto Trait Implementations§

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impl RefUnwindSafe for ETag

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impl Send for ETag

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impl Sync for ETag

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impl Unpin for ETag

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impl UnwindSafe for ETag

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> Same<T> for T

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type Output = T

Should always be Self
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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for Twhere T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> TryIntoHeaderPair for Twhere T: Header,

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impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more