Enum actix_web::http::header::IfRange

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pub enum IfRange {
    EntityTag(EntityTag),
    Date(HttpDate),
}
Expand description

If-Range header, defined in RFC 7233 §3.2

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.insert_header(
    IfRange::EntityTag(
        EntityTag::new(false, "abc".to_owned())
    )
);
use std::time::{Duration, SystemTime};
use actix_web::{http::header::IfRange, HttpResponse};

let mut builder = HttpResponse::Ok();
let fetched = SystemTime::now() - Duration::from_secs(60 * 60 * 24);
builder.insert_header(
    IfRange::Date(fetched.into())
);

Variants§

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EntityTag(EntityTag)

The entity-tag the client has of the resource.

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Date(HttpDate)

The date when the client retrieved the resource.

Trait Implementations§

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impl Clone for IfRange

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fn clone(&self) -> IfRange

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for IfRange

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Display for IfRange

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Header for IfRange

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fn name() -> HeaderName

Returns the name of the header field.
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fn parse<T>(msg: &T) -> Result<Self, ParseError>
where T: HttpMessage,

Parse the header from a HTTP message.
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impl PartialEq for IfRange

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fn eq(&self, other: &IfRange) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl TryIntoHeaderValue for IfRange

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type Error = InvalidHeaderValue

The type returned in the event of a conversion error.
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fn try_into_value(self) -> Result<HeaderValue, Self::Error>

Try to convert value to a HeaderValue.
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impl Eq for IfRange

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impl StructuralPartialEq for IfRange

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impl<T> Any for T
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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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fn equivalent(&self, key: &K) -> bool

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type Output = T

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Performs the conversion.
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impl<T> TryIntoHeaderPair for T
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