# [−][src]Struct actix_web::middleware::ErrorHandlers

    pub struct ErrorHandlers<S> { /* fields omitted */ }

`Middleware` for allowing custom handlers for responses.

You can use `ErrorHandlers::handler()` method to register a custom error handler for specific status code. You can modify existing response or create completely new one.

## Example

    use actix_web::middleware::{ErrorHandlers, Response};
    use actix_web::{http, App, HttpRequest, HttpResponse, Result};

    fn render_500<S>(_: &HttpRequest<S>, resp: HttpResponse) -> Result<Response> {
        let mut builder = resp.into_builder();
        builder.header(http::header::CONTENT_TYPE, "application/json");
        Ok(Response::Done(builder.into()))
    }

    fn main() {
        let app = App::new()
            .middleware(
                ErrorHandlers::new()
                    .handler(http::StatusCode::INTERNAL_SERVER_ERROR, render_500),
            )
            .resource("/test", |r| {
                r.method(http::Method::GET).f(|_| HttpResponse::Ok());
                r.method(http::Method::HEAD)
                    .f(|_| HttpResponse::MethodNotAllowed());
            })
            .finish();
    }

## Methods

###

`impl<S> ErrorHandlers<S>`

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####

`pub fn new() -> Self`

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Construct new `ErrorHandlers` instance

####

`pub fn handler<F>(self, status: StatusCode, handler: F) -> Self where F: Fn(&HttpRequest<S>, HttpResponse) -> Result<Response> + 'static,`

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Register error handler for specified status code

## Trait Implementations

###

`impl<S: 'static> Middleware<S> for ErrorHandlers<S>`

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####

`fn response(&self, req: &HttpRequest<S>, resp: HttpResponse) -> Result<Response>`

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Method is called when handler returns response, but before sending http message to peer. Read more

####

`fn start(&self, req: &HttpRequest<S>) -> Result<Started>`

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Method is called when request is ready. It may return future, which should resolve before next middleware get called. Read more

####

`fn finish(&self, req: &HttpRequest<S>, resp: &HttpResponse) -> Finished`

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Method is called after body stream get sent to peer.

###

`impl<S> Default for ErrorHandlers<S>`

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####

`fn default() -> Self`

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Returns the "default value" for a type. Read more

## Auto Trait Implementations

###

`impl<S> !Send for ErrorHandlers<S>`

###

`impl<S> !Sync for ErrorHandlers<S>`

## Blanket Implementations

###

`impl<T> From for T`

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####

`fn from(t: T) -> T`

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Performs the conversion.

###

`impl<T, U> Into for T where U: From<T>,`

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####

`fn into(self) -> U`

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Performs the conversion.

###

`impl<T, U> TryFrom for T where T: From<U>,`

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#### `type Error = !`

🔬 This is a nightly-only experimental API. (`try_from`)

The type returned in the event of a conversion error.

####

`fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`

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🔬 This is a nightly-only experimental API. (`try_from`)

Performs the conversion.

###

`impl<T> Borrow for T where T: ?Sized,`

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####

`fn borrow(&self) -> &T`

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Immutably borrows from an owned value. Read more

###

`impl<T> BorrowMut for T where T: ?Sized,`

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####

`fn borrow_mut(&mut self) -> &mut T`

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Mutably borrows from an owned value. Read more

###

`impl<T, U> TryInto for T where U: TryFrom<T>,`

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#### `type Error = <U as TryFrom<T>>::Error`

🔬 This is a nightly-only experimental API. (`try_from`)

The type returned in the event of a conversion error.

####

`fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`

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🔬 This is a nightly-only experimental API. (`try_from`)

Performs the conversion.

###

`impl<T> Any for T where T: 'static + ?Sized,`

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####

`fn get_type_id(&self) -> TypeId`

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🔬 This is a nightly-only experimental API. (`get_type_id`)

this method will likely be replaced by an associated static

Gets the `TypeId` of `self`. Read more

###

`impl<T> Erased for T`

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