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 hyper::header::{Headers, IfRange, EntityTag};
let mut headers = Headers::new();
headers.set(IfRange::EntityTag(EntityTag::new(false, "xyzzy".to_owned())));
// extern crate time;
use hyper::header::{Headers, IfRange, HttpDate};
use time::{self, Duration};
let mut headers = Headers::new();
headers.set(IfRange::Date(HttpDate(time::now() - Duration::days(1))));
Variants
EntityTag(EntityTag)
The entity-tag the client has of the resource
Date(HttpDate)
The date when the client retrieved the resource
Trait Implementations
sourceimpl HeaderFormat for IfRange
impl HeaderFormat for IfRange
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
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
fn clone_into(&self, target: &mut T)
toowned_clone_into
)Uses borrowed data to replace owned data, usually by cloning. Read more