pub fn to<F, T, R>(mut self, handler: F) -> Self
    where
        F: Handler<T, R>,
        T: FromRequest + 'static,
        R: Future + 'static,
        R::Output: Responder + 'static,
        <R::Output as Responder>::Body: MessageBody,
        <<R::Output as Responder>::Body as MessageBody>::Error: Into<BoxError>,
    {
        self.service = handler_service(handler);
        self
    }
/// Set handler function, use request extractors for parameters.
///
/// # Examples
/// ```
/// use actix_web::{web, http, App};
/// use serde::Deserialize;
///
/// #[derive(Deserialize)]
/// struct Info {
///     username: String,
/// }
///
/// /// extract path info using serde
/// async fn index(info: web::Path<Info>) -> String {
///     format!("Welcome {}!", info.username)
/// }
///
/// fn main() {
///     let app = App::new().service(
///         web::resource("/{username}/index.html") // <- define path parameters
///             .route(web::get().to(index))        // <- register handler
///     );
/// }
/// ```
///
/// It is possible to use multiple extractors for one handler function.
///
/// ```
/// # use std::collections::HashMap;
/// # use serde::Deserialize;
/// use actix_web::{web, App};
///
/// #[derive(Deserialize)]
/// struct Info {
///     username: String,
/// }
///
/// /// extract path info using serde
/// async fn index(path: web::Path<Info>, query: web::Query<HashMap<String, String>>, body: web::Json<Info>) -> String {
///     format!("Welcome {}!", path.username)
/// }
///
/// fn main() {
///     let app = App::new().service(
///         web::resource("/{username}/index.html") // <- define path parameters
///             .route(web::get().to(index))
///     );
/// }
/// ```
Set handler function, use request extractors for parameters.
Set handler function use request extractors for parameters .
pub fn to<F, T, R>(mut self, handler: F) -> Self
    where
        F: Handler<T, R>,
        T: FromRequest + 'static,
        R: Future + 'static,
        R::Output: Responder + 'static,
        <R::Output as Responder>::Body: MessageBody,
        <<R::Output as Responder>::Body as MessageBody>::Error: Into<BoxError>,
    {
        self.service = handler_service(handler);
        self
    }
pub fn to < F , T , R > ( mut self , handler : F ) -> Self where F : Handler < T , R > , T : FromRequest + ' static , R : Future + ' static , R :: Output : Responder + ' static , < R :: Output as Responder > :: Body : MessageBody , < < R :: Output as Responder > :: Body as MessageBody > :: Error : Into < BoxError > , { self . service = handler_service ( handler ) ; self }
Set handler function, use request extractors for parameters.
Set handler function use request extractors for parameters .
mut self
handler
F
mut self
handler
F
examples
```
use actix_web::{web, http, App};
use serde::Deserialize.
` ` ` use actix_web :: { web http App } ; use serde :: Deserialize .
[derive(deserialize)]
struct Info {
username: String,
}

extract path info using serde
async fn index(info: web::Path) -> String {
format!("Welcome {}!", info.username)
}

fn main() {
let app = App::new().service(
web::resource("/{username}/index.html") // <- define path parameters
.route(web::get().to(index))        // <- register handler
);
}
```

It is possible to use multiple extractors for one handler function.


struct Info { username : String } extract path info using serde async fn index ( info : web :: Path ) - > String { format! ( " Welcome {} ! " info . username ) } fn main () { let app = App :: new () . service ( web :: resource ( " / { username } / index . html " ) // < - define path parameters . route ( web :: get () . to ( index )) // < - register handler ) ; } ` ` ` It is possible to use multiple extractors for one handler function .
use std::collections::hashmap;
None
use serde::deserialize;
use actix_web::{web, App}.
use actix_web :: { web App } .
[derive(deserialize)]
struct Info {
username: String,
}

extract path info using serde
async fn index(path: web::Path, query: web::Query>, body: web::Json) -> String {
format!("Welcome {}!", path.username)
}

fn main() {
let app = App::new().service(
web::resource("/{username}/index.html") // <- define path parameters
.route(web::get().to(index))
);
}
```
struct Info { username : String } extract path info using serde async fn index ( path : web :: Path query : web :: Query > body : web :: Json ) - > String { format! ( " Welcome {} ! " path . username ) } fn main () { let app = App :: new () . service ( web :: resource ( " / { username } / index . html " ) // < - define path parameters . route ( web :: get () . to ( index )) ) ; } ` ` `