Struct hyper::header::EntityTag [] [src]

pub struct EntityTag {
    pub weak: bool,
    // some fields omitted
}

An entity tag, defined in RFC7232

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 1 ETag 2 Strong Comparison Weak Comparison
W/"1" W/"1" no match match
W/"1" W/"2" no match no match
W/"1" "1" no match match
"1" "1" match match

Fields

Weakness indicator for the tag

Methods

impl EntityTag
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Constructs a new EntityTag.

Panics

If the tag contains invalid characters.

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Constructs a new weak EntityTag.

Panics

If the tag contains invalid characters.

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Constructs a new strong EntityTag.

Panics

If the tag contains invalid characters.

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Get the tag.

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Set the tag.

Panics

If the tag contains invalid characters.

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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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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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The inverse of EntityTag.strong_eq().

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The inverse of EntityTag.weak_eq().

Trait Implementations

impl Clone for EntityTag
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Returns a copy of the value. Read more

1.0.0
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Performs copy-assignment from source. Read more

impl Debug for EntityTag
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Formats the value using the given formatter.

impl Eq for EntityTag
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impl PartialEq for EntityTag
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This method tests for self and other values to be equal, and is used by ==. Read more

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This method tests for !=.

impl Display for EntityTag
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Formats the value using the given formatter. Read more

impl FromStr for EntityTag
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The associated error which can be returned from parsing.

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