# actix_web::AsyncResponder - Rust
API documentation for the Rust `AsyncResponder` trait in crate `actix_web`.
Keywords: rust, rustlang, rust-lang, AsyncResponder

# [−] [src] Trait actix_web::AsyncResponder

    pub trait AsyncResponder<I, E>: Sized {
        fn responder(self) -> Box<Future<Item = I, Error = E>>;
    }

Convenience trait that converts `Future` object to a `Boxed` future

For example loading json from request's body is async operation.

    use actix_web::{
        App, AsyncResponder, Error, HttpMessage, HttpRequest, HttpResponse,
    };
    use futures::future::Future;

    #[derive(Deserialize, Debug)]
    struct MyObj {
        name: String,
    }

    fn index(mut req: HttpRequest) -> Box<Future<Item = HttpResponse, Error = Error>> {
        req.json()                   // <- get JsonBody future
           .from_err()
           .and_then(|val: MyObj| {  // <- deserialized value
               Ok(HttpResponse::Ok().into())
           })
        // Construct boxed future by using `AsyncResponder::responder()` method
        .responder()
    }

## Required Methods

### `fn responder(self) -> Box<Future<Item = I, Error = E>>`

Convert to a boxed future

## Implementors

###

`impl<F, I, E> AsyncResponder<I, E> for F where F: Future<Item = I, Error = E> + 'static, I: Responder + 'static, E: Into<Error> + 'static,`

[src]

####

`fn responder(self) -> Box<Future<Item = I, Error = E>>`

[src]

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