Struct Request

pub struct Request<T> { /* private fields */ }

Represents an HTTP request.

An HTTP request consists of a head and a potentially optional body. The body component is generic, enabling arbitrary types to represent the HTTP body. For example, the body could be Vec<u8>, a Stream of byte chunks, or a value that has been deserialized.

Examples

Creating a Request to send

use http::{Request, Response};

let mut request = Request::builder()
    .uri("https://www.rust-lang.org/")
    .header("User-Agent", "my-awesome-agent/1.0");

if needs_awesome_header() {
    request = request.header("Awesome", "yes");
}

let response = send(request.body(()).unwrap());

fn send(req: Request<()>) -> Response<()> {
    // ...
}

Inspecting a request to see what was sent.

use http::{Request, Response, StatusCode};

fn respond_to(req: Request<()>) -> http::Result<Response<()>> {
    if req.uri() != "/awesome-url" {
        return Response::builder()
            .status(StatusCode::NOT_FOUND)
            .body(())
    }

    let has_awesome_header = req.headers().contains_key("Awesome");
    let body = req.body();

    // ...
}

Deserialize a request of bytes via json:

use http::Request;
use serde::de;

fn deserialize<T>(req: Request<Vec<u8>>) -> serde_json::Result<Request<T>>
    where for<'de> T: de::Deserialize<'de>,
{
    let (parts, body) = req.into_parts();
    let body = serde_json::from_slice(&body)?;
    Ok(Request::from_parts(parts, body))
}

Or alternatively, serialize the body of a request to json

use http::Request;
use serde::ser;

fn serialize<T>(req: Request<T>) -> serde_json::Result<Request<Vec<u8>>>
    where T: ser::Serialize,
{
    let (parts, body) = req.into_parts();
    let body = serde_json::to_vec(&body)?;
    Ok(Request::from_parts(parts, body))
}

Implementations

impl Request<()>

pub fn builder() -> Builder

Creates a new builder-style object to manufacture a Request

This method returns an instance of Builder which can be used to create a Request.

Examples

let request = Request::builder()
    .method("GET")
    .uri("https://www.rust-lang.org/")
    .header("X-Custom-Foo", "Bar")
    .body(())
    .unwrap();

pub fn get<T>(uri: T) -> Builder

where Uri: TryFrom<T>, <Uri as TryFrom<T>>::Error: Into<Error>,

Creates a new Builder initialized with a GET method and the given URI.

This method returns an instance of Builder which can be used to create a Request.

Example

let request = Request::get("https://www.rust-lang.org/")
    .body(())
    .unwrap();

pub fn put<T>(uri: T) -> Builder

where Uri: TryFrom<T>, <Uri as TryFrom<T>>::Error: Into<Error>,

Creates a new Builder initialized with a PUT method and the given URI.

This method returns an instance of Builder which can be used to create a Request.

Example

let request = Request::put("https://www.rust-lang.org/")
    .body(())
    .unwrap();

pub fn post<T>(uri: T) -> Builder

where Uri: TryFrom<T>, <Uri as TryFrom<T>>::Error: Into<Error>,

Creates a new Builder initialized with a POST method and the given URI.

This method returns an instance of Builder which can be used to create a Request.

Example

let request = Request::post("https://www.rust-lang.org/")
    .body(())
    .unwrap();

pub fn delete<T>(uri: T) -> Builder

where Uri: TryFrom<T>, <Uri as TryFrom<T>>::Error: Into<Error>,

Creates a new Builder initialized with a DELETE method and the given URI.

This method returns an instance of Builder which can be used to create a Request.

Example

let request = Request::delete("https://www.rust-lang.org/")
    .body(())
    .unwrap();

pub fn options<T>(uri: T) -> Builder

where Uri: TryFrom<T>, <Uri as TryFrom<T>>::Error: Into<Error>,

Creates a new Builder initialized with an OPTIONS method and the given URI.

This method returns an instance of Builder which can be used to create a Request.

Example

let request = Request::options("https://www.rust-lang.org/")
    .body(())
    .unwrap();

pub fn head<T>(uri: T) -> Builder

where Uri: TryFrom<T>, <Uri as TryFrom<T>>::Error: Into<Error>,

Creates a new Builder initialized with a HEAD method and the given URI.

This method returns an instance of Builder which can be used to create a Request.

Example

let request = Request::head("https://www.rust-lang.org/")
    .body(())
    .unwrap();

pub fn connect<T>(uri: T) -> Builder

where Uri: TryFrom<T>, <Uri as TryFrom<T>>::Error: Into<Error>,

Creates a new Builder initialized with a CONNECT method and the given URI.

This method returns an instance of Builder which can be used to create a Request.

Example

let request = Request::connect("https://www.rust-lang.org/")
    .body(())
    .unwrap();

pub fn patch<T>(uri: T) -> Builder

where Uri: TryFrom<T>, <Uri as TryFrom<T>>::Error: Into<Error>,

Creates a new Builder initialized with a PATCH method and the given URI.

This method returns an instance of Builder which can be used to create a Request.

Example

let request = Request::patch("https://www.rust-lang.org/")
    .body(())
    .unwrap();

pub fn trace<T>(uri: T) -> Builder

where Uri: TryFrom<T>, <Uri as TryFrom<T>>::Error: Into<Error>,

Creates a new Builder initialized with a TRACE method and the given URI.

This method returns an instance of Builder which can be used to create a Request.

Example

let request = Request::trace("https://www.rust-lang.org/")
    .body(())
    .unwrap();

impl<T> Request<T>

pub fn new(body: T) -> Request<T>

Creates a new blank Request with the body

The component parts of this request will be set to their default, e.g. the GET method, no headers, etc.

Examples

let request = Request::new("hello world");

assert_eq!(*request.method(), Method::GET);
assert_eq!(*request.body(), "hello world");

pub fn from_parts(parts: Parts, body: T) -> Request<T>

Creates a new Request with the given components parts and body.

Examples

let request = Request::new("hello world");
let (mut parts, body) = request.into_parts();
parts.method = Method::POST;

let request = Request::from_parts(parts, body);

pub fn method(&self) -> &Method

Returns a reference to the associated HTTP method.

Examples

let request: Request<()> = Request::default();
assert_eq!(*request.method(), Method::GET);

pub fn method_mut(&mut self) -> &mut Method

Returns a mutable reference to the associated HTTP method.

Examples

let mut request: Request<()> = Request::default();
*request.method_mut() = Method::PUT;
assert_eq!(*request.method(), Method::PUT);

pub fn uri(&self) -> &Uri

Returns a reference to the associated URI.

Examples

let request: Request<()> = Request::default();
assert_eq!(*request.uri(), *"/");

pub fn uri_mut(&mut self) -> &mut Uri

Returns a mutable reference to the associated URI.

Examples

let mut request: Request<()> = Request::default();
*request.uri_mut() = "/hello".parse().unwrap();
assert_eq!(*request.uri(), *"/hello");

pub fn version(&self) -> Version

Returns the associated version.

Examples

let request: Request<()> = Request::default();
assert_eq!(request.version(), Version::HTTP_11);

pub fn version_mut(&mut self) -> &mut Version

Returns a mutable reference to the associated version.

Examples

let mut request: Request<()> = Request::default();
*request.version_mut() = Version::HTTP_2;
assert_eq!(request.version(), Version::HTTP_2);

pub fn headers(&self) -> &HeaderMap

Returns a reference to the associated header field map.

Examples

let request: Request<()> = Request::default();
assert!(request.headers().is_empty());

pub fn headers_mut(&mut self) -> &mut HeaderMap

Returns a mutable reference to the associated header field map.

Examples

let mut request: Request<()> = Request::default();
request.headers_mut().insert(HOST, HeaderValue::from_static("world"));
assert!(!request.headers().is_empty());

pub fn extensions(&self) -> &Extensions

Returns a reference to the associated extensions.

Examples

let request: Request<()> = Request::default();
assert!(request.extensions().get::<i32>().is_none());

pub fn extensions_mut(&mut self) -> &mut Extensions

Returns a mutable reference to the associated extensions.

Examples

let mut request: Request<()> = Request::default();
request.extensions_mut().insert("hello");
assert_eq!(request.extensions().get(), Some(&"hello"));

pub fn body(&self) -> &T

Returns a reference to the associated HTTP body.

Examples

let request: Request<String> = Request::default();
assert!(request.body().is_empty());

pub fn body_mut(&mut self) -> &mut T

Returns a mutable reference to the associated HTTP body.

Examples

let mut request: Request<String> = Request::default();
request.body_mut().push_str("hello world");
assert!(!request.body().is_empty());

pub fn into_body(self) -> T

Consumes the request, returning just the body.

Examples

let request = Request::new(10);
let body = request.into_body();
assert_eq!(body, 10);

pub fn into_parts(self) -> (Parts, T)

Consumes the request returning the head and body parts.

Examples

let request = Request::new(());
let (parts, body) = request.into_parts();
assert_eq!(parts.method, Method::GET);

pub fn map<F, U>(self, f: F) -> Request<U>

where F: FnOnce(T) -> U,

Consumes the request returning a new request with body mapped to the return type of the passed in function.

Examples

let request = Request::builder().body("some string").unwrap();
let mapped_request: Request<&[u8]> = request.map(|b| {
  assert_eq!(b, "some string");
  b.as_bytes()
});
assert_eq!(mapped_request.body(), &"some string".as_bytes());

Trait Implementations

impl<B> Body for Request<B>

where B: Body,

type Data = <B as Body>::Data

Values yielded by the Body.

type Error = <B as Body>::Error

The error type this Body might generate.

fn poll_data( self: Pin<&mut Request<B>>, cx: &mut Context<'_>, ) -> Poll<Option<Result<<Request<B> as Body>::Data, <Request<B> as Body>::Error>>>

Attempt to pull out the next data buffer of this stream.

fn poll_trailers( self: Pin<&mut Request<B>>, cx: &mut Context<'_>, ) -> Poll<Result<Option<HeaderMap>, <Request<B> as Body>::Error>>

Poll for an optional single HeaderMap of trailers.

fn is_end_stream(&self) -> bool

Returns true when the end of stream has been reached.

fn size_hint(&self) -> SizeHint

Returns the bounds on the remaining length of the stream.

fn data(&mut self) -> Data<'_, Self>

where Self: Sized + Unpin,

Returns future that resolves to next data chunk, if any.

fn trailers(&mut self) -> Trailers<'_, Self>

where Self: Sized + Unpin,

Returns future that resolves to trailers, if any.

fn map_data<F, B>(self, f: F) -> MapData<Self, F>

where Self: Sized, F: FnMut(Self::Data) -> B, B: Buf,

Maps this body’s data value to a different value.

fn map_err<F, E>(self, f: F) -> MapErr<Self, F>

where Self: Sized, F: FnMut(Self::Error) -> E,

Maps this body’s error value to a different value.

fn boxed(self) -> BoxBody<Self::Data, Self::Error>

where Self: Sized + Send + Sync + 'static,

Turn this body into a boxed trait object.

fn boxed_unsync(self) -> UnsyncBoxBody<Self::Data, Self::Error>

where Self: Sized + Send + 'static,

Turn this body into a boxed trait object that is !Sync.

impl<T> Debug for Request<T>

where T: Debug,

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

Formats the value using the given formatter.

impl<T> Default for Request<T>

where T: Default,

fn default() -> Request<T>

Returns the “default value” for a type.

impl<C, B> Service<Request<B>> for &Client<C, B>

where C: Connect + Clone + Send + Sync + 'static, B: HttpBody + Send + 'static, B::Data: Send, B::Error: Into<Box<dyn StdError + Send + Sync>>,

type Response = Response<Body>

Responses given by the service.

type Error = Error

Errors produced by the service.

type Future = ResponseFuture

The future response value.

fn poll_ready(&mut self, _: &mut Context<'_>) -> Poll<Result<(), Self::Error>>

Returns Poll::Ready(Ok(())) when the service is able to process requests.

fn call(&mut self, req: Request<B>) -> Self::Future

Process the request and return the response asynchronously.

impl<C, B> Service<Request<B>> for Client<C, B>

where C: Connect + Clone + Send + Sync + 'static, B: HttpBody + Send + 'static, B::Data: Send, B::Error: Into<Box<dyn StdError + Send + Sync>>,

type Response = Response<Body>

Responses given by the service.

type Error = Error

Errors produced by the service.

type Future = ResponseFuture

The future response value.

fn poll_ready(&mut self, _: &mut Context<'_>) -> Poll<Result<(), Self::Error>>

Returns Poll::Ready(Ok(())) when the service is able to process requests.

fn call(&mut self, req: Request<B>) -> Self::Future

Process the request and return the response asynchronously.

impl<B> Service<Request<B>> for SendRequest<B>

where B: HttpBody + 'static,

type Response = Response<Body>

Responses given by the service.

type Error = Error

Errors produced by the service.

type Future = ResponseFuture

The future response value.

fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>>

Returns Poll::Ready(Ok(())) when the service is able to process requests.

fn call(&mut self, req: Request<B>) -> Self::Future

Process the request and return the response asynchronously.