pub struct Response<T> {
    head: Parts,
    body: T,
}
Expand description

Represents an HTTP response

An HTTP response 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.

Typically you’ll work with responses on the client side as the result of sending a Request and on the server you’ll be generating a Response to send back to the client.

Examples

Creating a Response to return

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

fn respond_to(req: Request<()>) -> http::Result<Response<()>> {
    let mut builder = Response::builder()
        .header("Foo", "Bar")
        .status(StatusCode::OK);

    if req.headers().contains_key("Another-Header") {
        builder = builder.header("Another-Header", "Ack");
    }

    builder.body(())
}

A simple 404 handler

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

fn not_found(_req: Request<()>) -> http::Result<Response<()>> {
    Response::builder()
        .status(StatusCode::NOT_FOUND)
        .body(())
}

Or otherwise inspecting the result of a request:

use http::{Request, Response};

fn get(url: &str) -> http::Result<Response<()>> {
    // ...
}

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

if !response.status().is_success() {
    panic!("failed to get a successful response status!");
}

if let Some(date) = response.headers().get("Date") {
    // we've got a `Date` header!
}

let body = response.body();
// ...

Deserialize a response of bytes via json:

use http::Response;
use serde::de;

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

Or alternatively, serialize the body of a response to json

use http::Response;
use serde::ser;

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

Fields

head: Partsbody: T

Implementations

Creates a new builder-style object to manufacture a Response

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

Examples
let response = Response::builder()
    .status(200)
    .header("X-Custom-Foo", "Bar")
    .body(())
    .unwrap();

Creates a new blank Response with the body

The component ports of this response will be set to their default, e.g. the ok status, no headers, etc.

Examples
let response = Response::new("hello world");

assert_eq!(response.status(), StatusCode::OK);
assert_eq!(*response.body(), "hello world");

Creates a new Response with the given head and body

Examples
let response = Response::new("hello world");
let (mut parts, body) = response.into_parts();

parts.status = StatusCode::BAD_REQUEST;
let response = Response::from_parts(parts, body);

assert_eq!(response.status(), StatusCode::BAD_REQUEST);
assert_eq!(*response.body(), "hello world");

Returns the StatusCode.

Examples
let response: Response<()> = Response::default();
assert_eq!(response.status(), StatusCode::OK);

Returns a mutable reference to the associated StatusCode.

Examples
let mut response: Response<()> = Response::default();
*response.status_mut() = StatusCode::CREATED;
assert_eq!(response.status(), StatusCode::CREATED);

Returns a reference to the associated version.

Examples
let response: Response<()> = Response::default();
assert_eq!(response.version(), Version::HTTP_11);

Returns a mutable reference to the associated version.

Examples
let mut response: Response<()> = Response::default();
*response.version_mut() = Version::HTTP_2;
assert_eq!(response.version(), Version::HTTP_2);

Returns a reference to the associated header field map.

Examples
let response: Response<()> = Response::default();
assert!(response.headers().is_empty());

Returns a mutable reference to the associated header field map.

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

Returns a reference to the associated extensions.

Examples
let response: Response<()> = Response::default();
assert!(response.extensions().get::<i32>().is_none());

Returns a mutable reference to the associated extensions.

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

Returns a reference to the associated HTTP body.

Examples
let response: Response<String> = Response::default();
assert!(response.body().is_empty());

Returns a mutable reference to the associated HTTP body.

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

Consumes the response, returning just the body.

Examples
let response = Response::new(10);
let body = response.into_body();
assert_eq!(body, 10);

Consumes the response returning the head and body parts.

Examples
let response: Response<()> = Response::default();
let (parts, body) = response.into_parts();
assert_eq!(parts.status, StatusCode::OK);

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

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

Trait Implementations

Values yielded by the Body.

The error type this Body might generate.

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

Poll for an optional single HeaderMap of trailers. Read more

Returns true when the end of stream has been reached. Read more

Returns the bounds on the remaining length of the stream. Read more

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

Returns future that resolves to trailers, if any.

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

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

Turn this body into a boxed trait object.

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

Formats the value using the given formatter. Read more

Returns the “default value” for a type. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more