Enum CachePolicy 

pub enum CachePolicy {
    Revalidate,
    MaxAge(Duration),
    CacheFirst,
    NoCache,
}

How the cache should be consulted for a fetch.

Variants

Revalidate

Default. Always revalidate with a conditional GET (If-None-Match / If-Modified-Since); a 304 serves the cached body.

MaxAge(Duration)

Serve directly from cache without hitting the network if the cached entry is younger than this duration; otherwise behave like CachePolicy::Revalidate.

CacheFirst

Serve the cached entry without any network call, regardless of age, if one exists; only on a cache miss does it fetch (then behave like CachePolicy::Revalidate). Used by item lookup (rss show / MCP get_item) so a rolled feed window cannot evict an item the caller already saw. Exception to the always-revalidate default — see ADR-0014.

NoCache

Ignore the cache entirely (do not read or write it).

Trait Implementations

impl Clone for CachePolicy

fn clone(&self) -> CachePolicy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CachePolicy

impl Debug for CachePolicy

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

Formats the value using the given formatter.

impl Default for CachePolicy

fn default() -> CachePolicy

Returns the “default value” for a type.

impl Eq for CachePolicy

impl PartialEq for CachePolicy

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