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.set(IfRange::EntityTag(EntityTag::new(
false,
"xyzzy".to_owned(),
)));
use actix_web::HttpResponse;
use actix_web::http::header::IfRange;
use std::time::{Duration, SystemTime};
let mut builder = HttpResponse::Ok();
let fetched = SystemTime::now() - Duration::from_secs(60 * 60 * 24);
builder.set(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§
impl StructuralPartialEq for IfRange
Auto Trait Implementations§
impl RefUnwindSafe for IfRange
impl Send for IfRange
impl Sync for IfRange
impl Unpin for IfRange
impl UnwindSafe for IfRange
Blanket Implementations§
source§impl<T> IntoSql for T
impl<T> IntoSql for T
source§fn into_sql<T>(self) -> Self::Expressionwhere
Self: AsExpression<T> + Sized,
fn into_sql<T>(self) -> Self::Expressionwhere
Self: AsExpression<T> + Sized,
self
to an expression for Diesel’s query builder. Read moresource§fn as_sql<'a, T>(&'a self) -> <&'a Self as AsExpression<T>>::Expressionwhere
&'a Self: AsExpression<T>,
fn as_sql<'a, T>(&'a self) -> <&'a Self as AsExpression<T>>::Expressionwhere
&'a Self: AsExpression<T>,
&self
to an expression for Diesel’s query builder. Read more