Enum ajars_actix_web::actix_web::http::header::IfRange [−][src]
Expand description
If-Range
header, defined in RFC7233
If a client has a partial copy of a representation and wishes to have an up-to-date copy of the entire representation, it could use the Range header field with a conditional GET (using either or both of If-Unmodified-Since and If-Match.) However, if the precondition fails because the representation has been modified, the client would then have to make a second request to obtain the entire current representation.
The If-Range
header field allows a client to "short-circuit" the
second request. Informally, its meaning is as follows: if the
representation is unchanged, send me the part(s) that I am requesting
in Range; otherwise, send me the entire representation.
ABNF
If-Range = entity-tag / HTTP-date
Example values
Sat, 29 Oct 1994 19:43:31 GMT
\"xyzzy\"
Examples
use actix_web::HttpResponse; use actix_web::http::header::{EntityTag, IfRange}; let mut builder = HttpResponse::Ok(); builder.insert_header( IfRange::EntityTag( EntityTag::new(false, "abc".to_owned()) ) );
use std::time::{Duration, SystemTime}; use actix_web::{http::header::IfRange, HttpResponse}; let mut builder = HttpResponse::Ok(); let fetched = SystemTime::now() - Duration::from_secs(60 * 60 * 24); builder.insert_header( IfRange::Date(fetched.into()) );
Variants
EntityTag(EntityTag)
The entity-tag the client has of the resource.
Date(HttpDate)
The date when the client retrieved the resource.
Trait Implementations
Returns the name of the header field
Parse a header
type Error = InvalidHeaderValue
type Error = InvalidHeaderValue
The type returned in the event of a conversion error.
Try to convert value to a HeaderValue.
Auto Trait Implementations
impl RefUnwindSafe for IfRange
impl UnwindSafe for IfRange
Blanket Implementations
Mutably borrows from an owned value. Read more
Instruments this type with the provided Span
, returning an
Instrumented
wrapper. Read more
impl<T> IntoHeaderPair for T where
T: Header,
impl<T> IntoHeaderPair for T where
T: Header,
type Error = <T as IntoHeaderValue>::Error
pub fn try_into_header_pair(
self
) -> Result<(HeaderName, HeaderValue), <T as IntoHeaderPair>::Error>
type Output = T
type Output = T
Should always be Self
pub fn vzip(self) -> V