Struct rocket::http::Accept

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pub struct Accept(/* private fields */);
Expand description

The HTTP Accept header.

An Accept header is composed of zero or more media types, each of which may have an optional quality value (a QMediaType). The header is sent by an HTTP client to describe the formats it accepts as well as the order in which it prefers different formats.

Usage

The Accept header of an incoming request can be retrieved via the Request::accept() method. The preferred() method can be used to retrieve the client’s preferred media type.

An Accept type with a single, common media type can be easily constructed via provided associated constants.

Example

Construct an Accept header with a single application/json media type:

use rocket::http::Accept;

let accept_json = Accept::JSON;

Accept implements Into<Header>. As such, it can be used in any context where an Into<Header> is expected:

use rocket::http::Accept;
use rocket::response::Response;

let response = Response::build().header(Accept::JSON).finalize();

Implementations§

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impl Accept

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pub fn new<T>(items: T) -> Acceptwhere T: IntoCollection<QMediaType>,

Constructs a new Accept header from one or more media types.

The items parameter may be of type QMediaType, [QMediaType], &[QMediaType] or Vec<QMediaType>. To prevent additional allocations, prefer to provide inputs of type QMediaType, [QMediaType], or Vec<QMediaType>.

Example
use rocket::http::{QMediaType, MediaType, Accept};

// Construct an `Accept` via a `Vec<QMediaType>`.
let json_then_html = vec![MediaType::JSON.into(), MediaType::HTML.into()];
let accept = Accept::new(json_then_html);
assert_eq!(accept.preferred().media_type(), &MediaType::JSON);

// Construct an `Accept` via an `[QMediaType]`.
let accept = Accept::new([MediaType::JSON.into(), MediaType::HTML.into()]);
assert_eq!(accept.preferred().media_type(), &MediaType::JSON);

// Construct an `Accept` via a `QMediaType`.
let accept = Accept::new(QMediaType(MediaType::JSON, None));
assert_eq!(accept.preferred().media_type(), &MediaType::JSON);
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pub fn preferred(&self) -> &QMediaType

Retrieve the client’s preferred media type. This method follows RFC 7231 5.3.2. If the list of media types is empty, this method returns a media type of any with no quality value: (*/*).

Example
use rocket::http::{QMediaType, MediaType, Accept};

let media_types = vec![
    QMediaType(MediaType::JSON, Some(0.3)),
    QMediaType(MediaType::HTML, Some(0.9))
];

let accept = Accept::new(media_types);
assert_eq!(accept.preferred().media_type(), &MediaType::HTML);
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pub fn first(&self) -> Option<&QMediaType>

Retrieve the first media type in self, if any.

Example
use rocket::http::{QMediaType, MediaType, Accept};

let accept = Accept::new(QMediaType(MediaType::XML, None));
assert_eq!(accept.first(), Some(&MediaType::XML.into()));
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pub fn iter(&self) -> impl Iterator<Item = &QMediaType>

Returns an iterator over all of the (quality) media types in self. Media types are returned in the order in which they appear in the header.

Example
use rocket::http::{QMediaType, MediaType, Accept};

let qmedia_types = vec![
    QMediaType(MediaType::JSON, Some(0.3)),
    QMediaType(MediaType::HTML, Some(0.9))
];

let accept = Accept::new(qmedia_types.clone());

let mut iter = accept.iter();
assert_eq!(iter.next(), Some(&qmedia_types[0]));
assert_eq!(iter.next(), Some(&qmedia_types[1]));
assert_eq!(iter.next(), None);
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pub fn media_types(&self) -> impl Iterator<Item = &MediaType>

Returns an iterator over all of the (bare) media types in self. Media types are returned in the order in which they appear in the header.

Example
use rocket::http::{QMediaType, MediaType, Accept};

let qmedia_types = vec![
    QMediaType(MediaType::JSON, Some(0.3)),
    QMediaType(MediaType::HTML, Some(0.9))
];

let accept = Accept::new(qmedia_types.clone());

let mut iter = accept.media_types();
assert_eq!(iter.next(), Some(qmedia_types[0].media_type()));
assert_eq!(iter.next(), Some(qmedia_types[1].media_type()));
assert_eq!(iter.next(), None);
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pub const Any: Accept = _

An Accept header with the single media type for any media type :

/

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pub const Binary: Accept = _

An Accept header with the single media type for binary data : application / octet-stream

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pub const Bytes: Accept = _

An Accept header with the single media type for binary data : application / octet-stream

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pub const HTML: Accept = _

An Accept header with the single media type for HTML : text / html

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pub const Plain: Accept = _

An Accept header with the single media type for plain text : text / plain

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pub const Text: Accept = _

An Accept header with the single media type for plain text : text / plain

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pub const JSON: Accept = _

An Accept header with the single media type for JSON : application / json

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pub const MsgPack: Accept = _

An Accept header with the single media type for MsgPack : application / msgpack

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pub const Form: Accept = _

An Accept header with the single media type for forms : application / x-www-form-urlencoded

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pub const JavaScript: Accept = _

An Accept header with the single media type for JavaScript : text / javascript

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pub const CSS: Accept = _

An Accept header with the single media type for CSS : text / css

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pub const FormData: Accept = _

An Accept header with the single media type for multipart form data : multipart / form-data

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pub const XML: Accept = _

An Accept header with the single media type for XML : text / xml

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pub const OPF: Accept = _

An Accept header with the single media type for OPF : application / oebps-package+xml

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pub const XHTML: Accept = _

An Accept header with the single media type for XHTML : application / xhtml+xml

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pub const CSV: Accept = _

An Accept header with the single media type for CSV : text / csv

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pub const PNG: Accept = _

An Accept header with the single media type for PNG : image / png

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pub const GIF: Accept = _

An Accept header with the single media type for GIF : image / gif

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pub const BMP: Accept = _

An Accept header with the single media type for BMP : image / bmp

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pub const JPEG: Accept = _

An Accept header with the single media type for JPEG : image / jpeg

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pub const WEBP: Accept = _

An Accept header with the single media type for WEBP : image / webp

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pub const AVIF: Accept = _

An Accept header with the single media type for AVIF : image / avif

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pub const SVG: Accept = _

An Accept header with the single media type for SVG : image / svg+xml

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pub const Icon: Accept = _

An Accept header with the single media type for Icon : image / x-icon

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pub const WEBM: Accept = _

An Accept header with the single media type for WEBM : video / webm

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pub const WEBA: Accept = _

An Accept header with the single media type for WEBM Audio : audio / webm

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pub const OGG: Accept = _

An Accept header with the single media type for OGG Video : video / ogg

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pub const FLAC: Accept = _

An Accept header with the single media type for FLAC : audio / flac

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pub const WAV: Accept = _

An Accept header with the single media type for WAV : audio / wav

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pub const PDF: Accept = _

An Accept header with the single media type for PDF : application / pdf

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pub const TTF: Accept = _

An Accept header with the single media type for TTF : application / font-sfnt

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pub const OTF: Accept = _

An Accept header with the single media type for OTF : application / font-sfnt

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pub const WOFF: Accept = _

An Accept header with the single media type for WOFF : application / font-woff

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pub const WOFF2: Accept = _

An Accept header with the single media type for WOFF2 : font / woff2

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pub const JsonApi: Accept = _

An Accept header with the single media type for JSON API : application / vnd.api+json

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pub const WASM: Accept = _

An Accept header with the single media type for WASM : application / wasm

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pub const TIFF: Accept = _

An Accept header with the single media type for TIFF : image / tiff

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pub const AAC: Accept = _

An Accept header with the single media type for AAC Audio : audio / aac

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pub const Calendar: Accept = _

An Accept header with the single media type for iCalendar : text / calendar

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pub const MPEG: Accept = _

An Accept header with the single media type for MPEG Video : video / mpeg

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pub const TAR: Accept = _

An Accept header with the single media type for tape archive : application / x-tar

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pub const GZIP: Accept = _

An Accept header with the single media type for gzipped binary : application / gzip

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pub const MOV: Accept = _

An Accept header with the single media type for quicktime video : video / quicktime

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pub const MP3: Accept = _

An Accept header with the single media type for MPEG Audio : audio / mpeg

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pub const MP4: Accept = _

An Accept header with the single media type for MPEG4 Video : video / mp4

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pub const ZIP: Accept = _

An Accept header with the single media type for ZIP archive : application / zip

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pub const CBZ: Accept = _

An Accept header with the single media type for Comic ZIP archive : application / vnd.comicbook+zip

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pub const CBR: Accept = _

An Accept header with the single media type for Comic RAR compressed archive : application / vnd.comicbook-rar

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pub const RAR: Accept = _

An Accept header with the single media type for RAR compressed archive : application / vnd.rar

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pub const EPUB: Accept = _

An Accept header with the single media type for EPUB : application / epub+zip

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pub const EventStream: Accept = _

An Accept header with the single media type for SSE stream : text / event-stream

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pub const Markdown: Accept = _

An Accept header with the single media type for markdown text : text / markdown

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pub const EXE: Accept = _

An Accept header with the single media type for executable : application / vnd.microsoft.portable-executable

Trait Implementations§

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impl Clone for Accept

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fn clone(&self) -> Accept

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 Accept

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

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

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

Formats the value using the given formatter. Read more
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impl From<Accept> for Header<'static>

Creates a new Header with name Accept and the value set to the HTTP rendering of this Accept header.

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fn from(val: Accept) -> Header<'static>

Converts to this type from the input type.
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impl<T> From<T> for Acceptwhere T: IntoCollection<MediaType>,

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fn from(items: T) -> Accept

Converts to this type from the input type.
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impl<'r> FromRequest<'r> for &'r Accept

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type Error = Infallible

The associated error to be returned if derivation fails.
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fn from_request<'life0, 'async_trait>( request: &'r Request<'life0> ) -> Pin<Box<dyn Future<Output = Outcome<Self, Self::Error>> + Send + 'async_trait>>where Self: 'async_trait, 'r: 'async_trait, 'life0: 'async_trait,

Derives an instance of Self from the incoming request metadata. Read more
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impl FromStr for Accept

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type Err = String

The associated error which can be returned from parsing.
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fn from_str(raw: &str) -> Result<Accept, String>

Parses a string s to return a value of this type. Read more
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impl PartialEq<Accept> for Accept

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fn eq(&self, other: &Accept) -> 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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