Struct IfNoneMatch 

pub struct IfNoneMatch(/* private fields */);

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

impl IfNoneMatch

pub fn any() -> IfNoneMatch

Create a new If-None-Match: * header.

pub fn precondition_passes(&self, etag: &ETag) -> bool

Checks whether the ETag passes this precondition.

Trait Implementations

impl Clone for IfNoneMatch

fn clone(&self) -> IfNoneMatch

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for IfNoneMatch

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

Formats the value using the given formatter.

impl From<ETag> for IfNoneMatch

fn from(etag: ETag) -> IfNoneMatch

Converts to this type from the input type.

impl Header for IfNoneMatch

fn name() -> &'static HeaderName

The name of this header.

fn decode<'i, I>(values: &mut I) -> Result<Self, Error>

where I: Iterator<Item = &'i HeaderValue>,

Decode this type from an iterator of HeaderValues.

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

Encode this type to a HeaderMap.

impl PartialEq for IfNoneMatch

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl StructuralPartialEq for IfNoneMatch

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 40 bytes