Struct rocket::http::Accept [−] [src]

pub struct Accept(_);

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;

Header

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();

Methods

`impl Accept`
[src]

`fn new<T: IntoCollection<QMediaType>>(items: T) -> Accept`
[src]

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

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

`fn preferred(&self) -> &QMediaType`
[src]

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);

`fn first(&self) -> Option<&QMediaType>`
[src]

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()));

`fn iter<'a>(&'a self) -> impl Iterator<Item = &'a QMediaType> + 'a`
[src]

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);

`fn media_types<'a>(&'a self) -> impl Iterator<Item = &'a MediaType> + 'a`
[src]

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);