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 headers::IfRange;
use std::time::{SystemTime, Duration};
let fetched = SystemTime::now() - Duration::from_secs(60 * 60 * 24);
let if_range = IfRange::date(fetched);
Create an IfRange
header with an entity tag.
Create an IfRange
header with a date value.
Checks if the resource has been modified, or if the range request
can be served.
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 !=
.