Struct actix_web::http::header::EntityTag

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pub struct EntityTag {
    pub weak: bool,
    /* private fields */
}
Expand description

An entity tag, defined in [RFC 7232 §2.3].

An entity tag consists of a string enclosed by two literal double quotes. Preceding the first double quote is an optional weakness indicator, which always looks like W/. Examples for valid tags are "xyzzy" and W/"xyzzy".

§ABNF

entity-tag = [ weak ] opaque-tag
weak       = %x57.2F ; "W/", case-sensitive
opaque-tag = DQUOTE *etagc DQUOTE
etagc      = %x21 / %x23-7E / obs-text
           ; VCHAR except double quotes, plus obs-text

§Comparison

To check if two entity tags are equivalent in an application always use the strong_eq or weak_eq methods based on the context of the Tag. Only use == to check if two tags are identical.

The example below shows the results for a set of entity-tag pairs and both the weak and strong comparison function results:

ETag 1ETag 2Strong ComparisonWeak Comparison
W/"1"W/"1"no matchmatch
W/"1"W/"2"no matchno match
W/"1""1"no matchmatch
"1""1"matchmatch

RFC 7232 §2.3

Fields§

§weak: bool

Weakness indicator for the tag

Implementations§

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impl EntityTag

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pub fn new(weak: bool, tag: String) -> EntityTag

Constructs a new EntityTag.

§Panics

If the tag contains invalid characters.

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pub fn new_weak(tag: String) -> EntityTag

Constructs a new weak EntityTag.

§Panics

If the tag contains invalid characters.

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pub fn weak(tag: String) -> EntityTag

👎Deprecated since 3.0.0: Renamed to new_weak.
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pub fn new_strong(tag: String) -> EntityTag

Constructs a new strong EntityTag.

§Panics

If the tag contains invalid characters.

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pub fn strong(tag: String) -> EntityTag

👎Deprecated since 3.0.0: Renamed to new_strong.
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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 EntityTag

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fn clone(&self) -> EntityTag

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 EntityTag

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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 Display for EntityTag

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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 FromStr for EntityTag

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type Err = ParseError

The associated error which can be returned from parsing.
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fn from_str(slice: &str) -> Result<EntityTag, ParseError>

Parses a string s to return a value of this type. Read more
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impl PartialEq for EntityTag

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fn eq(&self, other: &EntityTag) -> 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 EntityTag

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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 EntityTag

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impl StructuralPartialEq for EntityTag

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where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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Immutably borrows from an owned value. Read more
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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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impl<Q, K> Equivalent<K> for Q
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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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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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