diff --git a/src/server/h1.rs b/src/server/h1.rs
index 1d2ddbe2d..739c66519 100644
--- a/src/server/h1.rs
+++ b/src/server/h1.rs
@@ -410,45 +410,52 @@ where
                     self.keepalive_timer.take();
 
                     // search handler for request
-                    for h in self.settings.handlers().iter() {
-                        msg = match h.handle(msg) {
-                            Ok(mut pipe) => {
-                                if self.tasks.is_empty() {
-                                    match pipe.poll_io(&mut self.stream) {
-                                        Ok(Async::Ready(ready)) => {
-                                            // override keep-alive state
-                                            if self.stream.keepalive() {
-                                                self.flags.insert(Flags::KEEPALIVE);
-                                            } else {
-                                                self.flags.remove(Flags::KEEPALIVE);
-                                            }
-                                            // prepare stream for next response
-                                            self.stream.reset();
+                    match self.settings.handler().handle(msg) {
+                        Ok(mut pipe) => {
+                            if self.tasks.is_empty() {
+                                match pipe.poll_io(&mut self.stream) {
+                                    Ok(Async::Ready(ready)) => {
+                                        // override keep-alive state
+                                        if self.stream.keepalive() {
+                                            self.flags.insert(Flags::KEEPALIVE);
+                                        } else {
+                                            self.flags.remove(Flags::KEEPALIVE);
+                                        }
+                                        // prepare stream for next response
+                                        self.stream.reset();
 
-                                            if !ready {
-                                                let item = Entry {
-                                                    pipe: EntryPipe::Task(pipe),
-                                                    flags: EntryFlags::EOF,
-                                                };
-                                                self.tasks.push_back(item);
-                                            }
-                                            continue 'outer;
-                                        }
-                                        Ok(Async::NotReady) => {}
-                                        Err(err) => {
-                                            error!("Unhandled error: {}", err);
-                                            self.flags.insert(Flags::ERROR);
-                                            return;
+                                        if !ready {
+                                            let item = Entry {
+                                                pipe: EntryPipe::Task(pipe),
+                                                flags: EntryFlags::EOF,
+                                            };
+                                            self.tasks.push_back(item);
                                         }
+                                        continue 'outer;
+                                    }
+                                    Ok(Async::NotReady) => {}
+                                    Err(err) => {
+                                        error!("Unhandled error: {}", err);
+                                        self.flags.insert(Flags::ERROR);
+                                        return;
                                     }
                                 }
-                                self.tasks.push_back(Entry {
-                                    pipe: EntryPipe::Task(pipe),
-                                    flags: EntryFlags::empty(),
-                                });
-                                continue 'outer;
                             }
-                            Err(msg) => msg,
+                            self.tasks.push_back(Entry {
+                                pipe: EntryPipe::Task(pipe),
+                                flags: EntryFlags::empty(),
+                            });
+                            continue 'outer;
+                        }
+                        Err(msg) => {
+                            // handler is not found
+                            self.tasks.push_back(Entry {
+                                pipe: EntryPipe::Error(ServerError::err(
+                                    Version::HTTP_11,
+                                    StatusCode::NOT_FOUND,
+                                )),
+                                flags: EntryFlags::empty(),
+                            });
                         }
                     }
 
diff --git a/src/server/h2.rs b/src/server/h2.rs
index ba52a8843..a7cf8aec5 100644
--- a/src/server/h2.rs
+++ b/src/server/h2.rs
@@ -368,28 +368,20 @@ impl<H: HttpHandler + 'static> Entry<H> {
         let psender = PayloadType::new(msg.headers(), psender);
 
         // start request processing
-        let mut task = None;
-        for h in settings.handlers().iter() {
-            msg = match h.handle(msg) {
-                Ok(t) => {
-                    task = Some(t);
-                    break;
-                }
-                Err(msg) => msg,
-            }
-        }
+        let task = match settings.handler().handle(msg) {
+            Ok(task) => EntryPipe::Task(task),
+            Err(msg) => EntryPipe::Error(ServerError::err(
+                Version::HTTP_2,
+                StatusCode::NOT_FOUND,
+            )),
+        };
 
         Entry {
-            task: task.map(EntryPipe::Task).unwrap_or_else(|| {
-                EntryPipe::Error(ServerError::err(
-                    Version::HTTP_2,
-                    StatusCode::NOT_FOUND,
-                ))
-            }),
+            task,
+            recv,
             payload: psender,
             stream: H2Writer::new(resp, settings),
             flags: EntryFlags::empty(),
-            recv,
         }
     }
 
diff --git a/src/server/http.rs b/src/server/http.rs
index 5cdeb5642..faee041c3 100644
--- a/src/server/http.rs
+++ b/src/server/http.rs
@@ -39,7 +39,7 @@ struct Socket<H: IntoHttpHandler> {
 pub struct HttpServer<H, F>
 where
     H: IntoHttpHandler + 'static,
-    F: Fn() -> Vec<H> + Send + Clone,
+    F: Fn() -> H + Send + Clone,
 {
     factory: F,
     host: Option<String>,
@@ -58,33 +58,10 @@ where
 impl<H, F> HttpServer<H, F>
 where
     H: IntoHttpHandler + 'static,
-    F: Fn() -> Vec<H> + Send + Clone + 'static,
+    F: Fn() -> H + Send + Clone + 'static,
 {
     /// Create new http server with application factory
-    pub fn new<F1, U>(factory: F1) -> HttpServer<H, impl Fn() -> Vec<H> + Send + Clone>
-    where
-        F1: Fn() -> U + Send + Clone,
-        U: IntoIterator<Item = H> + 'static,
-    {
-        let f = move || (factory.clone())().into_iter().collect();
-
-        HttpServer {
-            threads: num_cpus::get(),
-            factory: f,
-            host: None,
-            backlog: 2048,
-            keep_alive: KeepAlive::Os,
-            shutdown_timeout: 30,
-            exit: false,
-            no_http2: false,
-            no_signals: false,
-            maxconn: 25_600,
-            maxconnrate: 256,
-            sockets: Vec::new(),
-        }
-    }
-
-    pub(crate) fn with_factory(factory: F) -> HttpServer<H, F> {
+    pub fn new(factory: F) -> HttpServer<H, F> {
         HttpServer {
             factory,
             threads: num_cpus::get(),
@@ -489,7 +466,7 @@ where
     // }
 }
 
-impl<H: IntoHttpHandler, F: Fn() -> Vec<H> + Send + Clone> HttpServer<H, F> {
+impl<H: IntoHttpHandler, F: Fn() -> H + Send + Clone> HttpServer<H, F> {
     /// Start listening for incoming connections.
     ///
     /// This method starts number of http workers in separate threads.
@@ -629,7 +606,7 @@ impl<H: IntoHttpHandler, F: Fn() -> Vec<H> + Send + Clone> HttpServer<H, F> {
 
 struct HttpService<F, H, Io>
 where
-    F: Fn() -> Vec<H>,
+    F: Fn() -> H,
     H: IntoHttpHandler,
     Io: IoStream,
 {
@@ -642,7 +619,7 @@ where
 
 impl<F, H, Io> NewService for HttpService<F, H, Io>
 where
-    F: Fn() -> Vec<H>,
+    F: Fn() -> H,
     H: IntoHttpHandler,
     Io: IoStream,
 {
@@ -655,12 +632,9 @@ where
 
     fn new_service(&self) -> Self::Future {
         let s = ServerSettings::new(Some(self.addr), &self.host, false);
-        let apps: Vec<_> = (self.factory)()
-            .into_iter()
-            .map(|h| h.into_handler())
-            .collect();
+        let app = (self.factory)().into_handler();
 
-        ok(HttpServiceHandler::new(apps, self.keep_alive, s))
+        ok(HttpServiceHandler::new(app, self.keep_alive, s))
     }
 }
 
@@ -680,14 +654,14 @@ where
     Io: IoStream,
 {
     fn new(
-        apps: Vec<H>, keep_alive: KeepAlive, settings: ServerSettings,
+        app: H, keep_alive: KeepAlive, settings: ServerSettings,
     ) -> HttpServiceHandler<H, Io> {
         let tcp_ka = if let KeepAlive::Tcp(val) = keep_alive {
             Some(time::Duration::new(val as u64, 0))
         } else {
             None
         };
-        let settings = WorkerSettings::new(apps, keep_alive, settings);
+        let settings = WorkerSettings::new(app, keep_alive, settings);
 
         HttpServiceHandler {
             tcp_ka,
@@ -733,7 +707,7 @@ where
 struct SimpleFactory<H, F, P>
 where
     H: IntoHttpHandler,
-    F: Fn() -> Vec<H> + Send + Clone,
+    F: Fn() -> H + Send + Clone,
     P: HttpPipelineFactory<Io = TcpStream>,
 {
     pub addr: net::SocketAddr,
@@ -744,7 +718,7 @@ where
 impl<H: IntoHttpHandler, F, P> Clone for SimpleFactory<H, F, P>
 where
     P: HttpPipelineFactory<Io = TcpStream>,
-    F: Fn() -> Vec<H> + Send + Clone,
+    F: Fn() -> H + Send + Clone,
 {
     fn clone(&self) -> Self {
         SimpleFactory {
@@ -758,7 +732,7 @@ where
 impl<H, F, P> ServiceFactory<H> for SimpleFactory<H, F, P>
 where
     H: IntoHttpHandler + 'static,
-    F: Fn() -> Vec<H> + Send + Clone + 'static,
+    F: Fn() -> H + Send + Clone + 'static,
     P: HttpPipelineFactory<Io = TcpStream>,
 {
     fn register(&self, server: Server, lst: net::TcpListener) -> Server {
@@ -894,7 +868,7 @@ where
 
 struct DefaultPipelineFactory<F, H, Io>
 where
-    F: Fn() -> Vec<H> + Send + Clone,
+    F: Fn() -> H + Send + Clone,
 {
     factory: F,
     host: Option<String>,
@@ -906,7 +880,7 @@ where
 impl<F, H, Io> DefaultPipelineFactory<F, H, Io>
 where
     Io: IoStream + Send,
-    F: Fn() -> Vec<H> + Send + Clone + 'static,
+    F: Fn() -> H + Send + Clone + 'static,
     H: IntoHttpHandler + 'static,
 {
     fn new(
@@ -925,7 +899,7 @@ where
 impl<F, H, Io> Clone for DefaultPipelineFactory<F, H, Io>
 where
     Io: IoStream,
-    F: Fn() -> Vec<H> + Send + Clone,
+    F: Fn() -> H + Send + Clone,
     H: IntoHttpHandler,
 {
     fn clone(&self) -> Self {
@@ -942,7 +916,7 @@ where
 impl<F, H, Io> HttpPipelineFactory for DefaultPipelineFactory<F, H, Io>
 where
     Io: IoStream + Send,
-    F: Fn() -> Vec<H> + Send + Clone + 'static,
+    F: Fn() -> H + Send + Clone + 'static,
     H: IntoHttpHandler + 'static,
 {
     type Io = Io;
diff --git a/src/server/mod.rs b/src/server/mod.rs
index 6ba033762..ec7e8e4e2 100644
--- a/src/server/mod.rs
+++ b/src/server/mod.rs
@@ -174,13 +174,12 @@ const HW_BUFFER_SIZE: usize = 32_768;
 ///     sys.run();
 /// }
 /// ```
-pub fn new<F, U, H>(factory: F) -> HttpServer<H, impl Fn() -> Vec<H> + Send + Clone>
+pub fn new<F, H>(factory: F) -> HttpServer<H, F>
 where
-    F: Fn() -> U + Send + Clone + 'static,
-    U: IntoIterator<Item = H>,
+    F: Fn() -> H + Send + Clone + 'static,
     H: IntoHttpHandler + 'static,
 {
-    HttpServer::with_factory(move || (factory.clone())().into_iter().collect())
+    HttpServer::new(factory)
 }
 
 #[doc(hidden)]
diff --git a/src/server/settings.rs b/src/server/settings.rs
index 47da515a0..18a8c0956 100644
--- a/src/server/settings.rs
+++ b/src/server/settings.rs
@@ -136,7 +136,7 @@ const DATE_VALUE_LENGTH: usize = 29;
 pub(crate) struct WorkerSettings<H>(Rc<Inner<H>>);
 
 struct Inner<H> {
-    h: Vec<H>,
+    handler: H,
     keep_alive: u64,
     ka_enabled: bool,
     bytes: Rc<SharedBytesPool>,
@@ -153,7 +153,7 @@ impl<H> Clone for WorkerSettings<H> {
 
 impl<H> WorkerSettings<H> {
     pub(crate) fn new(
-        h: Vec<H>, keep_alive: KeepAlive, settings: ServerSettings,
+        handler: H, keep_alive: KeepAlive, settings: ServerSettings,
     ) -> WorkerSettings<H> {
         let (keep_alive, ka_enabled) = match keep_alive {
             KeepAlive::Timeout(val) => (val as u64, true),
@@ -162,7 +162,7 @@ impl<H> WorkerSettings<H> {
         };
 
         WorkerSettings(Rc::new(Inner {
-            h,
+            handler,
             keep_alive,
             ka_enabled,
             bytes: Rc::new(SharedBytesPool::new()),
@@ -176,8 +176,8 @@ impl<H> WorkerSettings<H> {
         self.0.node.borrow_mut()
     }
 
-    pub fn handlers(&self) -> &Vec<H> {
-        &self.0.h
+    pub fn handler(&self) -> &H {
+        &self.0.handler
     }
 
     pub fn keep_alive_timer(&self) -> Option<Delay> {
diff --git a/src/test.rs b/src/test.rs
index c589ea4b0..b9d64f270 100644
--- a/src/test.rs
+++ b/src/test.rs
@@ -103,14 +103,12 @@ impl TestServer {
     }
 
     /// Start new test server with application factory
-    pub fn with_factory<F, U, H>(factory: F) -> Self
+    pub fn with_factory<F, H>(factory: F) -> Self
     where
-        F: Fn() -> U + Send + Clone + 'static,
-        U: IntoIterator<Item = H>,
+        F: Fn() -> H + Send + Clone + 'static,
         H: IntoHttpHandler + 'static,
     {
         let (tx, rx) = mpsc::channel();
-        let factory = move || (factory.clone())().into_iter().collect();
 
         // run server in separate thread
         thread::spawn(move || {
@@ -118,7 +116,7 @@ impl TestServer {
             let tcp = net::TcpListener::bind("127.0.0.1:0").unwrap();
             let local_addr = tcp.local_addr().unwrap();
 
-            let _ = HttpServer::with_factory(factory)
+            let _ = HttpServer::new(factory)
                 .disable_signals()
                 .listen(tcp)
                 .keep_alive(5)
@@ -328,10 +326,10 @@ where
 
             let sys = System::new("actix-test-server");
             let state = self.state;
-            let mut srv = HttpServer::with_factory(move || {
+            let mut srv = HttpServer::new(move || {
                 let mut app = TestApp::new(state());
                 config(&mut app);
-                vec![app]
+                app
             }).workers(1)
             .keep_alive(5)
             .disable_signals();