Struct viz_core::headers::IfNoneMatch

pub struct IfNoneMatch(_);

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 copy 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<(), Error>

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

Decode this type from an iterator of HeaderValues.

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

Encode this type to a HeaderMap.

impl PartialEq<IfNoneMatch> for IfNoneMatch

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

This method tests for self and other values to be equal, and is used by ==.

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.

impl StructuralPartialEq for IfNoneMatch