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.
If-Range = entity-tag / HTTP-date
Sat, 29 Oct 1994 19:43:31 GMT
\"xyzzy\"
use hyper::header::{Headers, IfRange, EntityTag};
let mut headers = Headers::new();
headers.set(IfRange::EntityTag(EntityTag::new(false, "xyzzy".to_owned())));
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))));
The entity-tag the client has of the resource
The date when the client retrieved the resource
Performs copy-assignment from source
. Read more
Formats the value using the given formatter. Read more
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.
Returns the name of the header field this belongs to. Read more
Parse a header from a raw stream of bytes. Read more
Format a header to be output into a TcpStream. Read more
Formats the value using the given formatter. Read more