use actix_web::Error for middleware errors

src/app.rs

@@ -3,8 +3,6 @@ use std::marker::PhantomData;
 use std::rc::Rc;
 
 use actix_http::body::{Body, MessageBody};
-use actix_http::PayloadStream;
-use actix_router::ResourceDef;
 use actix_server_config::ServerConfig;
 use actix_service::boxed::{self, BoxedNewService};
 use actix_service::{
@@ -14,6 +12,8 @@ use futures::IntoFuture;
 
 use crate::app_service::{AppChain, AppEntry, AppInit, AppRouting, AppRoutingFactory};
 use crate::config::{AppConfig, AppConfigInner};
+use crate::dev::{PayloadStream, ResourceDef};
+use crate::error::Error;
 use crate::resource::Resource;
 use crate::route::Route;
 use crate::service::{
@@ -22,7 +22,8 @@ use crate::service::{
 };
 use crate::state::{State, StateFactory};
 
-type HttpNewService<P> = BoxedNewService<(), ServiceRequest<P>, ServiceResponse, (), ()>;
+type HttpNewService<P> =
+    BoxedNewService<(), ServiceRequest<P>, ServiceResponse, Error, ()>;
 
 /// Application builder - structure that follows the builder pattern
 /// for building application instances.
@@ -55,7 +56,7 @@ where
     T: NewService<
         Request = ServiceRequest,
         Response = ServiceRequest<P>,
-        Error = (),
+        Error = Error,
         InitError = (),
     >,
 {
@@ -118,7 +119,7 @@ where
         impl NewService<
             Request = ServiceRequest<P>,
             Response = ServiceResponse<B>,
-            Error = (),
+            Error = Error,
             InitError = (),
         >,
     >
@@ -127,7 +128,7 @@ where
             AppRouting<P>,
             Request = ServiceRequest<P>,
             Response = ServiceResponse<B>,
-            Error = (),
+            Error = Error,
             InitError = (),
         >,
         F: IntoTransform<M, AppRouting<P>>,
@@ -157,7 +158,7 @@ where
         impl NewService<
             Request = ServiceRequest,
             Response = ServiceRequest<P1>,
-            Error = (),
+            Error = Error,
             InitError = (),
         >,
     >
@@ -165,7 +166,7 @@ where
         C: NewService<
             Request = ServiceRequest<P>,
             Response = ServiceRequest<P1>,
-            Error = (),
+            Error = Error,
             InitError = (),
         >,
         F: IntoNewService<C>,
@@ -264,7 +265,7 @@ where
     T: NewService<
         Request = ServiceRequest<P>,
         Response = ServiceResponse<B>,
-        Error = (),
+        Error = Error,
         InitError = (),
     >,
 {
@@ -324,7 +325,7 @@ where
         impl NewService<
             Request = ServiceRequest<P>,
             Response = ServiceResponse<B1>,
-            Error = (),
+            Error = Error,
             InitError = (),
         >,
     >
@@ -333,7 +334,7 @@ where
             T::Service,
             Request = ServiceRequest<P>,
             Response = ServiceResponse<B1>,
-            Error = (),
+            Error = Error,
             InitError = (),
         >,
         B1: MessageBody,
@@ -363,7 +364,7 @@ where
         U: NewService<
                 Request = ServiceRequest<P>,
                 Response = ServiceResponse,
-                Error = (),
+                Error = Error,
                 InitError = (),
             > + 'static,
     {
@@ -415,13 +416,13 @@ where
     T: NewService<
         Request = ServiceRequest<P>,
         Response = ServiceResponse<B>,
-        Error = (),
+        Error = Error,
         InitError = (),
     >,
     C: NewService<
         Request = ServiceRequest,
         Response = ServiceRequest<P>,
-        Error = (),
+        Error = Error,
         InitError = (),
     >,
 {

src/app_service.rs

@@ -11,15 +11,17 @@ use futures::future::{ok, Either, FutureResult};
 use futures::{Async, Future, Poll};
 
 use crate::config::{AppConfig, ServiceConfig};
+use crate::error::Error;
 use crate::guard::Guard;
 use crate::rmap::ResourceMap;
 use crate::service::{ServiceFactory, ServiceRequest, ServiceResponse};
 use crate::state::{StateFactory, StateFactoryResult};
 
 type Guards = Vec<Box<Guard>>;
-type HttpService<P> = BoxedService<ServiceRequest<P>, ServiceResponse, ()>;
+type HttpService<P> = BoxedService<ServiceRequest<P>, ServiceResponse, Error>;
-type HttpNewService<P> = BoxedNewService<(), ServiceRequest<P>, ServiceResponse, (), ()>;
+type HttpNewService<P> =
-type BoxedResponse = Box<Future<Item = ServiceResponse, Error = ()>>;
+    BoxedNewService<(), ServiceRequest<P>, ServiceResponse, Error, ()>;
+type BoxedResponse = Box<Future<Item = ServiceResponse, Error = Error>>;
 
 /// Service factory to convert `Request` to a `ServiceRequest<S>`.
 /// It also executes state factories.
@@ -29,7 +31,7 @@ where
     T: NewService<
         Request = ServiceRequest<P>,
         Response = ServiceResponse<B>,
-        Error = (),
+        Error = Error,
         InitError = (),
     >,
 {
@@ -48,13 +50,13 @@ where
     C: NewService<
         Request = ServiceRequest,
         Response = ServiceRequest<P>,
-        Error = (),
+        Error = Error,
         InitError = (),
     >,
     T: NewService<
         Request = ServiceRequest<P>,
         Response = ServiceResponse<B>,
-        Error = (),
+        Error = Error,
         InitError = (),
     >,
 {
@@ -147,13 +149,13 @@ where
     C: NewService<
         Request = ServiceRequest,
         Response = ServiceRequest<P>,
-        Error = (),
+        Error = Error,
         InitError = (),
     >,
     T: NewService<
         Request = ServiceRequest<P>,
         Response = ServiceResponse<B>,
-        Error = (),
+        Error = Error,
         InitError = (),
     >,
 {
@@ -201,7 +203,7 @@ where
 /// Service to convert `Request` to a `ServiceRequest<S>`
 pub struct AppInitService<C, P>
 where
-    C: Service<Request = ServiceRequest, Response = ServiceRequest<P>, Error = ()>,
+    C: Service<Request = ServiceRequest, Response = ServiceRequest<P>, Error = Error>,
 {
     chain: C,
     rmap: Rc<ResourceMap>,
@@ -210,7 +212,7 @@ where
 
 impl<C, P> Service for AppInitService<C, P>
 where
-    C: Service<Request = ServiceRequest, Response = ServiceRequest<P>, Error = ()>,
+    C: Service<Request = ServiceRequest, Response = ServiceRequest<P>, Error = Error>,
 {
     type Request = Request;
     type Response = ServiceRequest<P>;
@@ -240,7 +242,7 @@ pub struct AppRoutingFactory<P> {
 impl<P: 'static> NewService for AppRoutingFactory<P> {
     type Request = ServiceRequest<P>;
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type InitError = ();
     type Service = AppRouting<P>;
     type Future = AppRoutingFactoryResponse<P>;
@@ -350,7 +352,7 @@ pub struct AppRouting<P> {
 impl<P> Service for AppRouting<P> {
     type Request = ServiceRequest<P>;
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type Future = Either<BoxedResponse, FutureResult<Self::Response, Self::Error>>;
 
     fn poll_ready(&mut self) -> Poll<(), Self::Error> {
@@ -398,7 +400,7 @@ impl<P> AppEntry<P> {
 impl<P: 'static> NewService for AppEntry<P> {
     type Request = ServiceRequest<P>;
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type InitError = ();
     type Service = AppRouting<P>;
     type Future = AppRoutingFactoryResponse<P>;
@@ -414,7 +416,7 @@ pub struct AppChain;
 impl NewService for AppChain {
     type Request = ServiceRequest;
     type Response = ServiceRequest;
-    type Error = ();
+    type Error = Error;
     type InitError = ();
     type Service = AppChain;
     type Future = FutureResult<Self::Service, Self::InitError>;
@@ -427,7 +429,7 @@ impl NewService for AppChain {
 impl Service for AppChain {
     type Request = ServiceRequest;
     type Response = ServiceRequest;
-    type Error = ();
+    type Error = Error;
     type Future = FutureResult<Self::Response, Self::Error>;
 
     #[inline]

src/config.rs

@@ -6,13 +6,14 @@ use actix_http::Extensions;
 use actix_router::ResourceDef;
 use actix_service::{boxed, IntoNewService, NewService};
 
+use crate::error::Error;
 use crate::guard::Guard;
 use crate::rmap::ResourceMap;
 use crate::service::{ServiceRequest, ServiceResponse};
 
 type Guards = Vec<Box<Guard>>;
 type HttpNewService<P> =
-    boxed::BoxedNewService<(), ServiceRequest<P>, ServiceResponse, (), ()>;
+    boxed::BoxedNewService<(), ServiceRequest<P>, ServiceResponse, Error, ()>;
 
 /// Application configuration
 pub struct ServiceConfig<P> {
@@ -84,7 +85,7 @@ impl<P: 'static> ServiceConfig<P> {
         S: NewService<
                 Request = ServiceRequest<P>,
                 Response = ServiceResponse,
-                Error = (),
+                Error = Error,
                 InitError = (),
             > + 'static,
     {

src/handler.rs

@@ -193,7 +193,7 @@ where
 {
     type Request = (T, HttpRequest);
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type InitError = ();
     type Service = AsyncHandlerService<F, T, R>;
     type Future = FutureResult<Self::Service, ()>;
@@ -227,7 +227,7 @@ where
 {
     type Request = (T, HttpRequest);
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type Future = AsyncHandlerServiceResponse<R::Future>;
 
     fn poll_ready(&mut self) -> Poll<(), Self::Error> {
@@ -255,7 +255,7 @@ where
     T::Error: Into<Error>,
 {
     type Item = ServiceResponse;
-    type Error = ();
+    type Error = Error;
 
     fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
         match self.fut.poll() {

src/lib.rs

@@ -40,7 +40,6 @@ pub use crate::responder::{Either, Responder};
 pub use crate::route::Route;
 pub use crate::scope::Scope;
 pub use crate::server::HttpServer;
-pub use crate::service::{ServiceFromRequest, ServiceRequest, ServiceResponse};
 
 pub mod dev {
     //! The `actix-web` prelude for library developers
@@ -58,7 +57,9 @@ pub mod dev {
     pub use crate::config::{AppConfig, ServiceConfig};
     pub use crate::info::ConnectionInfo;
     pub use crate::rmap::ResourceMap;
-    pub use crate::service::HttpServiceFactory;
+    pub use crate::service::{
+        HttpServiceFactory, ServiceFromRequest, ServiceRequest, ServiceResponse,
+    };
 
     pub use actix_http::body::{Body, BodyLength, MessageBody, ResponseBody};
     pub use actix_http::dev::ResponseBuilder as HttpResponseBuilder;

src/middleware/defaultheaders.rs

@@ -152,9 +152,10 @@ mod tests {
     use actix_service::FnService;
 
     use super::*;
+    use crate::dev::ServiceRequest;
     use crate::http::header::CONTENT_TYPE;
     use crate::test::{block_on, TestRequest};
-    use crate::{HttpResponse, ServiceRequest};
+    use crate::HttpResponse;
 
     #[test]
     fn test_default_headers() {

src/middleware/errhandlers.rs

@@ -0,0 +1,210 @@
+use std::rc::Rc;
+
+use actix_service::{Service, Transform};
+use futures::future::{err, ok, Either, Future, FutureResult};
+use futures::Poll;
+use hashbrown::HashMap;
+
+use crate::dev::{ServiceRequest, ServiceResponse};
+use crate::error::{Error, Result};
+use crate::http::StatusCode;
+
+/// Error handler response
+pub enum ErrorHandlerResponse<B> {
+    /// New http response got generated
+    Response(ServiceResponse<B>),
+    /// Result is a future that resolves to a new http response
+    Future(Box<Future<Item = ServiceResponse<B>, Error = Error>>),
+}
+
+type ErrorHandler<B> = Fn(ServiceResponse<B>) -> Result<ErrorHandlerResponse<B>>;
+
+/// `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
+///
+/// ```rust
+/// use actix_web::middleware::{ErrorHandlers, ErrorHandlerResponse};
+/// use actix_web::{web, http, dev, App, HttpRequest, HttpResponse, Result};
+///
+/// fn render_500<B>(mut res: dev::ServiceResponse<B>) -> Result<ErrorHandlerResponse<B>> {
+///     res.response_mut()
+///        .headers_mut()
+///        .insert(http::header::CONTENT_TYPE, http::HeaderValue::from_static("Error"));
+///     Ok(ErrorHandlerResponse::Response(res))
+/// }
+///
+/// fn main() {
+///     let app = App::new()
+///         .middleware(
+///             ErrorHandlers::new()
+///                 .handler(http::StatusCode::INTERNAL_SERVER_ERROR, render_500),
+///         )
+///         .service(web::resource("/test")
+///             .route(web::get().to(|| HttpResponse::Ok()))
+///             .route(web::head().to(|| HttpResponse::MethodNotAllowed())
+///         ));
+/// }
+/// ```
+pub struct ErrorHandlers<B> {
+    handlers: Rc<HashMap<StatusCode, Box<ErrorHandler<B>>>>,
+}
+
+impl<B> Default for ErrorHandlers<B> {
+    fn default() -> Self {
+        ErrorHandlers {
+            handlers: Rc::new(HashMap::new()),
+        }
+    }
+}
+
+impl<B> ErrorHandlers<B> {
+    /// Construct new `ErrorHandlers` instance
+    pub fn new() -> Self {
+        ErrorHandlers::default()
+    }
+
+    /// Register error handler for specified status code
+    pub fn handler<F>(mut self, status: StatusCode, handler: F) -> Self
+    where
+        F: Fn(ServiceResponse<B>) -> Result<ErrorHandlerResponse<B>> + 'static,
+    {
+        Rc::get_mut(&mut self.handlers)
+            .unwrap()
+            .insert(status, Box::new(handler));
+        self
+    }
+}
+
+impl<S, P, B> Transform<S> for ErrorHandlers<B>
+where
+    S: Service<
+        Request = ServiceRequest<P>,
+        Response = ServiceResponse<B>,
+        Error = Error,
+    >,
+    S::Future: 'static,
+    S::Error: 'static,
+    B: 'static,
+{
+    type Request = ServiceRequest<P>;
+    type Response = ServiceResponse<B>;
+    type Error = Error;
+    type InitError = ();
+    type Transform = ErrorHandlersMiddleware<S, B>;
+    type Future = FutureResult<Self::Transform, Self::InitError>;
+
+    fn new_transform(&self, service: S) -> Self::Future {
+        ok(ErrorHandlersMiddleware {
+            service,
+            handlers: self.handlers.clone(),
+        })
+    }
+}
+
+pub struct ErrorHandlersMiddleware<S, B> {
+    service: S,
+    handlers: Rc<HashMap<StatusCode, Box<ErrorHandler<B>>>>,
+}
+
+impl<S, P, B> Service for ErrorHandlersMiddleware<S, B>
+where
+    S: Service<
+        Request = ServiceRequest<P>,
+        Response = ServiceResponse<B>,
+        Error = Error,
+    >,
+    S::Future: 'static,
+    S::Error: 'static,
+    B: 'static,
+{
+    type Request = ServiceRequest<P>;
+    type Response = ServiceResponse<B>;
+    type Error = Error;
+    type Future = Box<Future<Item = Self::Response, Error = Self::Error>>;
+
+    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
+        self.service.poll_ready()
+    }
+
+    fn call(&mut self, req: ServiceRequest<P>) -> Self::Future {
+        let handlers = self.handlers.clone();
+
+        Box::new(self.service.call(req).and_then(move |res| {
+            if let Some(handler) = handlers.get(&res.status()) {
+                match handler(res) {
+                    Ok(ErrorHandlerResponse::Response(res)) => Either::A(ok(res)),
+                    Ok(ErrorHandlerResponse::Future(fut)) => Either::B(fut),
+                    Err(e) => Either::A(err(e)),
+                }
+            } else {
+                Either::A(ok(res))
+            }
+        }))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use actix_service::FnService;
+    use futures::future::ok;
+
+    use super::*;
+    use crate::http::{header::CONTENT_TYPE, HeaderValue, StatusCode};
+    use crate::test::{self, TestRequest};
+    use crate::HttpResponse;
+
+    fn render_500<B>(mut res: ServiceResponse<B>) -> Result<ErrorHandlerResponse<B>> {
+        res.response_mut()
+            .headers_mut()
+            .insert(CONTENT_TYPE, HeaderValue::from_static("0001"));
+        Ok(ErrorHandlerResponse::Response(res))
+    }
+
+    #[test]
+    fn test_handler() {
+        let srv = FnService::new(|req: ServiceRequest<_>| {
+            req.into_response(HttpResponse::InternalServerError().finish())
+        });
+
+        let mut mw = test::block_on(
+            ErrorHandlers::new()
+                .handler(StatusCode::INTERNAL_SERVER_ERROR, render_500)
+                .new_transform(srv),
+        )
+        .unwrap();
+
+        let resp = test::call_success(&mut mw, TestRequest::default().to_service());
+        assert_eq!(resp.headers().get(CONTENT_TYPE).unwrap(), "0001");
+    }
+
+    fn render_500_async<B: 'static>(
+        mut res: ServiceResponse<B>,
+    ) -> Result<ErrorHandlerResponse<B>> {
+        res.response_mut()
+            .headers_mut()
+            .insert(CONTENT_TYPE, HeaderValue::from_static("0001"));
+        Ok(ErrorHandlerResponse::Future(Box::new(ok(res))))
+    }
+
+    #[test]
+    fn test_handler_async() {
+        let srv = FnService::new(|req: ServiceRequest<_>| {
+            req.into_response(HttpResponse::InternalServerError().finish())
+        });
+
+        let mut mw = test::block_on(
+            ErrorHandlers::new()
+                .handler(StatusCode::INTERNAL_SERVER_ERROR, render_500_async)
+                .new_transform(srv),
+        )
+        .unwrap();
+
+        let resp = test::call_success(&mut mw, TestRequest::default().to_service());
+        assert_eq!(resp.headers().get(CONTENT_TYPE).unwrap(), "0001");
+    }
+}

src/middleware/mod.rs

@@ -4,13 +4,15 @@ mod compress;
 pub use self::compress::Compress;
 
 mod defaultheaders;
+mod errhandlers;
+mod logger;
+
 pub use self::defaultheaders::DefaultHeaders;
+pub use self::errhandlers::{ErrorHandlerResponse, ErrorHandlers};
+pub use self::logger::Logger;
 
 // #[cfg(feature = "session")]
 // pub use actix_session as session;
 
-mod logger;
-pub use self::logger::Logger;
-
 #[cfg(feature = "session")]
 pub mod identity;

src/resource.rs

@@ -17,8 +17,9 @@ use crate::responder::Responder;
 use crate::route::{CreateRouteService, Route, RouteService};
 use crate::service::{ServiceRequest, ServiceResponse};
 
-type HttpService<P> = BoxedService<ServiceRequest<P>, ServiceResponse, ()>;
+type HttpService<P> = BoxedService<ServiceRequest<P>, ServiceResponse, Error>;
-type HttpNewService<P> = BoxedNewService<(), ServiceRequest<P>, ServiceResponse, (), ()>;
+type HttpNewService<P> =
+    BoxedNewService<(), ServiceRequest<P>, ServiceResponse, Error, ()>;
 
 /// *Resource* is an entry in route table which corresponds to requested URL.
 ///
@@ -70,7 +71,7 @@ where
     T: NewService<
         Request = ServiceRequest<P>,
         Response = ServiceResponse,
-        Error = (),
+        Error = Error,
         InitError = (),
     >,
 {
@@ -232,7 +233,7 @@ where
         impl NewService<
             Request = ServiceRequest<P>,
             Response = ServiceResponse,
-            Error = (),
+            Error = Error,
             InitError = (),
         >,
     >
@@ -241,7 +242,7 @@ where
             T::Service,
             Request = ServiceRequest<P>,
             Response = ServiceResponse,
-            Error = (),
+            Error = Error,
             InitError = (),
         >,
         F: IntoTransform<M, T::Service>,
@@ -266,7 +267,7 @@ where
         U: NewService<
                 Request = ServiceRequest<P>,
                 Response = ServiceResponse,
-                Error = (),
+                Error = Error,
             > + 'static,
     {
         // create and configure default resource
@@ -284,7 +285,7 @@ where
     T: NewService<
             Request = ServiceRequest<P>,
             Response = ServiceResponse,
-            Error = (),
+            Error = Error,
             InitError = (),
         > + 'static,
 {
@@ -314,7 +315,7 @@ where
     T: NewService<
         Request = ServiceRequest<P>,
         Response = ServiceResponse,
-        Error = (),
+        Error = Error,
         InitError = (),
     >,
 {
@@ -336,7 +337,7 @@ pub struct ResourceFactory<P> {
 impl<P: 'static> NewService for ResourceFactory<P> {
     type Request = ServiceRequest<P>;
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type InitError = ();
     type Service = ResourceService<P>;
     type Future = CreateResourceService<P>;
@@ -427,9 +428,9 @@ pub struct ResourceService<P> {
 impl<P> Service for ResourceService<P> {
     type Request = ServiceRequest<P>;
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type Future = Either<
-        Box<Future<Item = ServiceResponse, Error = ()>>,
+        Box<Future<Item = ServiceResponse, Error = Error>>,
         Either<
             Box<Future<Item = Self::Response, Error = Self::Error>>,
             FutureResult<Self::Response, Self::Error>,
@@ -472,7 +473,7 @@ impl<P> ResourceEndpoint<P> {
 impl<P: 'static> NewService for ResourceEndpoint<P> {
     type Request = ServiceRequest<P>;
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type InitError = ();
     type Service = ResourceService<P>;
     type Future = CreateResourceService<P>;

src/route.rs

@@ -17,8 +17,8 @@ type BoxedRouteService<Req, Res> = Box<
     Service<
         Request = Req,
         Response = Res,
-        Error = (),
+        Error = Error,
-        Future = Box<Future<Item = Res, Error = ()>>,
+        Future = Box<Future<Item = Res, Error = Error>>,
     >,
 >;
 
@@ -26,7 +26,7 @@ type BoxedRouteNewService<Req, Res> = Box<
     NewService<
         Request = Req,
         Response = Res,
-        Error = (),
+        Error = Error,
         InitError = (),
         Service = BoxedRouteService<Req, Res>,
         Future = Box<Future<Item = BoxedRouteService<Req, Res>, Error = ()>>,
@@ -73,7 +73,7 @@ impl<P: 'static> Route<P> {
 impl<P> NewService for Route<P> {
     type Request = ServiceRequest<P>;
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type InitError = ();
     type Service = RouteService<P>;
     type Future = CreateRouteService<P>;
@@ -129,7 +129,7 @@ impl<P> RouteService<P> {
 impl<P> Service for RouteService<P> {
     type Request = ServiceRequest<P>;
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type Future = Box<Future<Item = Self::Response, Error = Self::Error>>;
 
     fn poll_ready(&mut self) -> Poll<(), Self::Error> {
@@ -188,7 +188,7 @@ impl<P: 'static> Route<P> {
     //     T: NewService<
     //         Request = HandlerRequest<S>,
     //         Response = HandlerRequest<S, U>,
-    //         InitError = (),
+    //         InitError = Error,
     //     >,
     // {
     //     RouteServiceBuilder {
@@ -372,7 +372,7 @@ where
 {
     type Request = ServiceRequest<P>;
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type InitError = ();
     type Service = BoxedRouteService<ServiceRequest<P>, Self::Response>;
     type Future = Box<Future<Item = Self::Service, Error = Self::InitError>>;
@@ -410,11 +410,11 @@ where
 {
     type Request = ServiceRequest<P>;
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type Future = Box<Future<Item = Self::Response, Error = Self::Error>>;
 
     fn poll_ready(&mut self) -> Poll<(), Self::Error> {
-        self.service.poll_ready().map_err(|_| ())
+        self.service.poll_ready().map_err(|(e, _)| e)
     }
 
     fn call(&mut self, req: ServiceRequest<P>) -> Self::Future {

src/scope.rs

@@ -11,6 +11,7 @@ use futures::future::{ok, Either, Future, FutureResult};
 use futures::{Async, Poll};
 
 use crate::dev::{HttpServiceFactory, ServiceConfig};
+use crate::error::Error;
 use crate::guard::Guard;
 use crate::resource::Resource;
 use crate::rmap::ResourceMap;
@@ -20,9 +21,10 @@ use crate::service::{
 };
 
 type Guards = Vec<Box<Guard>>;
-type HttpService<P> = BoxedService<ServiceRequest<P>, ServiceResponse, ()>;
+type HttpService<P> = BoxedService<ServiceRequest<P>, ServiceResponse, Error>;
-type HttpNewService<P> = BoxedNewService<(), ServiceRequest<P>, ServiceResponse, (), ()>;
+type HttpNewService<P> =
-type BoxedResponse = Box<Future<Item = ServiceResponse, Error = ()>>;
+    BoxedNewService<(), ServiceRequest<P>, ServiceResponse, Error, ()>;
+type BoxedResponse = Box<Future<Item = ServiceResponse, Error = Error>>;
 
 /// Resources scope
 ///
@@ -83,7 +85,7 @@ where
     T: NewService<
         Request = ServiceRequest<P>,
         Response = ServiceResponse,
-        Error = (),
+        Error = Error,
         InitError = (),
     >,
 {
@@ -176,7 +178,7 @@ where
         U: NewService<
                 Request = ServiceRequest<P>,
                 Response = ServiceResponse,
-                Error = (),
+                Error = Error,
                 InitError = (),
             > + 'static,
     {
@@ -201,7 +203,7 @@ where
         impl NewService<
             Request = ServiceRequest<P>,
             Response = ServiceResponse,
-            Error = (),
+            Error = Error,
             InitError = (),
         >,
     >
@@ -210,7 +212,7 @@ where
             T::Service,
             Request = ServiceRequest<P>,
             Response = ServiceResponse,
-            Error = (),
+            Error = Error,
             InitError = (),
         >,
         F: IntoTransform<M, T::Service>,
@@ -233,7 +235,7 @@ where
     T: NewService<
             Request = ServiceRequest<P>,
             Response = ServiceResponse,
-            Error = (),
+            Error = Error,
             InitError = (),
         > + 'static,
 {
@@ -290,7 +292,7 @@ pub struct ScopeFactory<P> {
 impl<P: 'static> NewService for ScopeFactory<P> {
     type Request = ServiceRequest<P>;
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type InitError = ();
     type Service = ScopeService<P>;
     type Future = ScopeFactoryResponse<P>;
@@ -406,7 +408,7 @@ pub struct ScopeService<P> {
 impl<P> Service for ScopeService<P> {
     type Request = ServiceRequest<P>;
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type Future = Either<BoxedResponse, FutureResult<Self::Response, Self::Error>>;
 
     fn poll_ready(&mut self) -> Poll<(), Self::Error> {
@@ -450,7 +452,7 @@ impl<P> ScopeEndpoint<P> {
 impl<P: 'static> NewService for ScopeEndpoint<P> {
     type Request = ServiceRequest<P>;
     type Response = ServiceResponse;
-    type Error = ();
+    type Error = Error;
     type InitError = ();
     type Service = ScopeService<P>;
     type Future = ScopeFactoryResponse<P>;

src/service.rs

@@ -340,6 +340,12 @@ impl<B> ServiceResponse<B> {
         Self::from_err(err, self.request)
     }
 
+    /// Create service response
+    #[inline]
+    pub fn into_response<B1>(self, response: Response<B1>) -> ServiceResponse<B1> {
+        ServiceResponse::new(self.request, response)
+    }
+
     /// Get reference to original request
     #[inline]
     pub fn request(&self) -> &HttpRequest {
@@ -358,18 +364,6 @@ impl<B> ServiceResponse<B> {
         &mut self.response
     }
 
-    /// Get the headers from the response
-    #[inline]
-    pub fn headers(&self) -> &HeaderMap {
-        self.response.headers()
-    }
-
-    /// Get a mutable reference to the headers
-    #[inline]
-    pub fn headers_mut(&mut self) -> &mut HeaderMap {
-        self.response.headers_mut()
-    }
-
     /// Execute closure and in case of error convert it to response.
     pub fn checked_expr<F, E>(mut self, f: F) -> Self
     where

src/test.rs

@@ -14,9 +14,9 @@ use bytes::Bytes;
 use futures::Future;
 
 use crate::config::{AppConfig, AppConfigInner};
-use crate::request::HttpRequest;
 use crate::rmap::ResourceMap;
 use crate::service::{ServiceFromRequest, ServiceRequest, ServiceResponse};
+use crate::{HttpRequest, HttpResponse};
 
 thread_local! {
     static RT: RefCell<Runtime> = {
@@ -277,6 +277,11 @@ impl TestRequest {
         self.req.finish()
     }
 
+    /// Complete request creation and generate `ServiceResponse` instance
+    pub fn to_response<B>(self, res: HttpResponse<B>) -> ServiceResponse<B> {
+        self.to_service().into_response(res)
+    }
+
     /// Complete request creation and generate `HttpRequest` instance
     pub fn to_http_request(mut self) -> HttpRequest {
         let req = self.req.finish();