Struct salvo::http::headers::IfRange [−][src]
pub struct IfRange(_);
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 headers::IfRange;
use std::time::{SystemTime, Duration};
let fetched = SystemTime::now() - Duration::from_secs(60 * 60 * 24);
let if_range = IfRange::date(fetched);
Implementations
Create an IfRange
header with a date value.
Checks if the resource has been modified, or if the range request can be served.
Trait Implementations
The name of this header.
Decode this type from an iterator of HeaderValue
s.
Auto Trait Implementations
impl RefUnwindSafe for IfRange
impl UnwindSafe for IfRange
Blanket Implementations
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pub fn vzip(self) -> V
Attaches the provided Subscriber
to this type, returning a
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Attaches the current default Subscriber
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