diff --git a/actix-rt/src/builder.rs b/actix-rt/src/builder.rs
index 4eb65991..c1a273f4 100644
--- a/actix-rt/src/builder.rs
+++ b/actix-rt/src/builder.rs
@@ -130,8 +130,14 @@ impl<E: ExecFactory> SystemRunner<E> {
         }
     }
 
+    pub fn spawn<F>(&mut self, fut: F)
+    where
+        F: Future<Output = ()> + 'static,
+    {
+        E::spawn_ref(&mut self.rt, fut);
+    }
+
     /// Execute a future and wait for result.
-    #[inline]
     pub fn block_on<F, O>(&mut self, fut: F) -> O
     where
         F: Future<Output = O>,
diff --git a/actix-rt/src/lib.rs b/actix-rt/src/lib.rs
index 8d92eca5..7078c7ad 100644
--- a/actix-rt/src/lib.rs
+++ b/actix-rt/src/lib.rs
@@ -33,7 +33,7 @@ pub fn spawn<F>(f: F)
 where
     F: Future<Output = ()> + 'static,
 {
-    DefaultExec::spawn(f)
+    DefaultExec::spawn(f);
 }
 
 /// Asynchronous signal handling
diff --git a/actix-rt/src/runtime.rs b/actix-rt/src/runtime.rs
index 91920d11..b6823376 100644
--- a/actix-rt/src/runtime.rs
+++ b/actix-rt/src/runtime.rs
@@ -1,13 +1,16 @@
 use std::future::Future;
 use std::io;
+use std::time::Duration;
+
 use tokio::{runtime, task::LocalSet};
 
 /// A trait for construct async executor and run future on it.
 ///
 /// A factory trait is necessary as `actix` and `actix-web` can run on multiple instances of
 /// executors. Therefore the executor would be constructed multiple times
-pub trait ExecFactory: Sized + Unpin + 'static {
+pub trait ExecFactory: Sized + Send + Sync + Unpin + 'static {
     type Executor;
+    type Sleep: Future<Output = ()> + Send + Unpin + 'static;
 
     fn build() -> io::Result<Self::Executor>;
 
@@ -64,6 +67,9 @@ pub trait ExecFactory: Sized + Unpin + 'static {
     ///
     /// *. `spawn_ref` is preferred when you can choose between it and `spawn`.
     fn spawn_ref<F: Future<Output = ()> + 'static>(exec: &mut Self::Executor, f: F);
+
+    /// Get a timeout sleep future with given duration.
+    fn sleep(dur: Duration) -> Self::Sleep;
 }
 
 /// Default Single-threaded tokio executor on the current thread.
@@ -78,6 +84,7 @@ pub type DefaultExecutor = (runtime::Runtime, LocalSet);
 
 impl ExecFactory for DefaultExec {
     type Executor = DefaultExecutor;
+    type Sleep = tokio::time::Delay;
 
     fn build() -> io::Result<Self::Executor> {
         let rt = runtime::Builder::new()
@@ -95,6 +102,7 @@ impl ExecFactory for DefaultExec {
         rt.block_on(local.run_until(f))
     }
 
+    #[inline]
     fn spawn<F: Future<Output = ()> + 'static>(f: F) {
         tokio::task::spawn_local(f);
     }
@@ -102,4 +110,9 @@ impl ExecFactory for DefaultExec {
     fn spawn_ref<F: Future<Output = ()> + 'static>(exec: &mut Self::Executor, f: F) {
         exec.1.spawn_local(f);
     }
+
+    #[inline]
+    fn sleep(dur: Duration) -> Self::Sleep {
+        tokio::time::delay_for(dur)
+    }
 }
diff --git a/actix-rt/tests/integration_tests.rs b/actix-rt/tests/integration_tests.rs
index 4e228d38..dcf70f25 100644
--- a/actix-rt/tests/integration_tests.rs
+++ b/actix-rt/tests/integration_tests.rs
@@ -74,6 +74,7 @@ struct TokioCompatExec;
 
 impl ExecFactory for TokioCompatExec {
     type Executor = tokio_compat::runtime::current_thread::Runtime;
+    type Sleep = tokio::time::Delay;
 
     fn build() -> std::io::Result<Self::Executor> {
         let rt = tokio_compat::runtime::current_thread::Runtime::new()?;
@@ -94,6 +95,10 @@ impl ExecFactory for TokioCompatExec {
     fn spawn_ref<F: Future<Output = ()> + 'static>(exec: &mut Self::Executor, f: F) {
         exec.spawn_std(f);
     }
+
+    fn sleep(dur: Duration) -> Self::Sleep {
+        tokio::time::delay_for(dur)
+    }
 }
 
 #[test]
diff --git a/actix-server/Cargo.toml b/actix-server/Cargo.toml
index 1a67f61c..189e9c54 100644
--- a/actix-server/Cargo.toml
+++ b/actix-server/Cargo.toml
@@ -41,4 +41,5 @@ mio-uds = { version = "0.6.7" }
 bytes = "0.5"
 env_logger = "0.7"
 actix-testing = "1.0.0"
+async-std = { version = "1.6.5", features = ["unstable", "tokio02"] }
 tokio = { version = "0.2", features = ["io-util"] }
diff --git a/actix-server/examples/custom_executor.rs b/actix-server/examples/custom_executor.rs
new file mode 100644
index 00000000..81807274
--- /dev/null
+++ b/actix-server/examples/custom_executor.rs
@@ -0,0 +1,128 @@
+//! Simple composite-service TCP echo server.
+//!
+//! Using the following command:
+//!
+//! ```sh
+//! nc 127.0.0.1 8080
+//! ```
+//!
+//! Start typing. When you press enter the typed line will be echoed back. The server will log
+//! the length of each line it echos and the total size of data sent when the connection is closed.
+
+use std::future::Future;
+use std::pin::Pin;
+use std::sync::atomic::{AtomicUsize, Ordering};
+use std::sync::Arc;
+use std::time::Duration;
+use std::{env, io};
+
+use actix_rt::ExecFactory;
+use actix_server::{FromStream, Server, StdStream};
+use actix_service::pipeline_factory;
+use futures_util::future::ok;
+use log::{error, info};
+
+fn main() -> io::Result<()> {
+    actix_rt::System::new_with::<AsyncStdExec, _>("actix").block_on(async {
+        env::set_var("RUST_LOG", "actix=trace,basic=trace");
+        env_logger::init();
+
+        let count = Arc::new(AtomicUsize::new(0));
+
+        let addr = ("127.0.0.1", 8080);
+        info!("starting server on port: {}", &addr.0);
+
+        // Bind socket address and start worker(s). By default, the server uses the number of available
+        // logical CPU cores as the worker count. For this reason, the closure passed to bind needs
+        // to return a service *factory*; so it can be created once per worker.
+        Server::build_with::<AsyncStdExec>()
+            .bind("echo", addr, move || {
+                let count = Arc::clone(&count);
+                let num2 = Arc::clone(&count);
+
+                pipeline_factory(move |mut stream: AsyncStdTcpStream| {
+                    let count = Arc::clone(&count);
+
+                    async move {
+                        let num = count.fetch_add(1, Ordering::SeqCst);
+                        let num = num + 1;
+
+                        let mut size = 0;
+                        let mut buf = vec![0; 1024];
+
+                        use async_std::prelude::*;
+
+                        loop {
+                            match stream.0.read(&mut buf).await {
+                                // end of stream; bail from loop
+                                Ok(0) => break,
+
+                                // more bytes to process
+                                Ok(bytes_read) => {
+                                    info!("[{}] read {} bytes", num, bytes_read);
+                                    stream.0.write_all(&buf[size..]).await.unwrap();
+                                    size += bytes_read;
+                                }
+
+                                // stream error; bail from loop with error
+                                Err(err) => {
+                                    error!("Stream Error: {:?}", err);
+                                    return Err(());
+                                }
+                            }
+                        }
+
+                        // send data down service pipeline
+                        Ok((buf.len(), size))
+                    }
+                })
+                .map_err(|err| error!("Service Error: {:?}", err))
+                .and_then(move |(_, size)| {
+                    let num = num2.load(Ordering::SeqCst);
+                    info!("[{}] total bytes read: {}", num, size);
+                    ok(size)
+                })
+            })?
+            .workers(1)
+            .run()
+            .await
+    })
+}
+
+struct AsyncStdExec;
+
+struct AsyncStdTcpStream(async_std::net::TcpStream);
+
+impl FromStream for AsyncStdTcpStream {
+    fn from_stdstream(stream: StdStream) -> std::io::Result<Self> {
+        match stream {
+            StdStream::Tcp(tcp) => Ok(AsyncStdTcpStream(async_std::net::TcpStream::from(tcp))),
+            _ => unimplemented!(),
+        }
+    }
+}
+
+impl ExecFactory for AsyncStdExec {
+    type Executor = ();
+    type Sleep = Pin<Box<dyn Future<Output = ()> + Send + 'static>>;
+
+    fn build() -> std::io::Result<Self::Executor> {
+        Ok(())
+    }
+
+    fn block_on<F: Future>(_: &mut Self::Executor, f: F) -> <F as Future>::Output {
+        async_std::task::block_on(f)
+    }
+
+    fn spawn<F: Future<Output = ()> + 'static>(f: F) {
+        async_std::task::spawn_local(f);
+    }
+
+    fn spawn_ref<F: Future<Output = ()> + 'static>(_: &mut Self::Executor, f: F) {
+        async_std::task::spawn_local(f);
+    }
+
+    fn sleep(dur: Duration) -> Self::Sleep {
+        Box::pin(async_std::task::sleep(dur))
+    }
+}
diff --git a/actix-server/src/accept.rs b/actix-server/src/accept.rs
index 4dc218fd..60d6a98d 100644
--- a/actix-server/src/accept.rs
+++ b/actix-server/src/accept.rs
@@ -1,9 +1,9 @@
+use std::marker::PhantomData;
 use std::sync::mpsc as sync_mpsc;
-use std::time::Duration;
+use std::time::{Duration, Instant};
 use std::{io, thread};
 
-use actix_rt::time::{delay_until, Instant};
-use actix_rt::System;
+use actix_rt::{ExecFactory, System};
 use log::{error, info};
 use slab::Slab;
 
@@ -81,14 +81,16 @@ impl AcceptLoop {
         AcceptNotify::new(self.notify_ready.clone())
     }
 
-    pub(crate) fn start(
+    pub(crate) fn start<Exec>(
         &mut self,
         socks: Vec<(Token, StdListener)>,
         workers: Vec<WorkerClient>,
-    ) {
+    ) where
+        Exec: ExecFactory,
+    {
         let srv = self.srv.take().expect("Can not re-use AcceptInfo");
 
-        Accept::start(
+        Accept::<Exec>::start(
             self.rx.take().expect("Can not re-use AcceptInfo"),
             self.cmd_reg.take().expect("Can not re-use AcceptInfo"),
             self.notify_reg.take().expect("Can not re-use AcceptInfo"),
@@ -99,7 +101,7 @@ impl AcceptLoop {
     }
 }
 
-struct Accept {
+struct Accept<Exec> {
     poll: mio::Poll,
     rx: sync_mpsc::Receiver<Command>,
     sockets: Slab<ServerSocketInfo>,
@@ -108,6 +110,7 @@ struct Accept {
     timer: (mio::Registration, mio::SetReadiness),
     next: usize,
     backpressure: bool,
+    _exec: PhantomData<Exec>,
 }
 
 const DELTA: usize = 100;
@@ -128,7 +131,10 @@ fn connection_error(e: &io::Error) -> bool {
         || e.kind() == io::ErrorKind::ConnectionReset
 }
 
-impl Accept {
+impl<Exec> Accept<Exec>
+where
+    Exec: ExecFactory,
+{
     #![allow(clippy::too_many_arguments)]
     pub(crate) fn start(
         rx: sync_mpsc::Receiver<Command>,
@@ -145,7 +151,7 @@ impl Accept {
             .name("actix-server accept loop".to_owned())
             .spawn(move || {
                 System::set_current(sys);
-                let mut accept = Accept::new(rx, socks, workers, srv);
+                let mut accept = Accept::<Exec>::new(rx, socks, workers, srv);
 
                 // Start listening for incoming commands
                 if let Err(err) = accept.poll.register(
@@ -176,7 +182,7 @@ impl Accept {
         socks: Vec<(Token, StdListener)>,
         workers: Vec<WorkerClient>,
         srv: Server,
-    ) -> Accept {
+    ) -> Accept<Exec> {
         // Create a poll instance
         let poll = match mio::Poll::new() {
             Ok(poll) => poll,
@@ -227,6 +233,7 @@ impl Accept {
             next: 0,
             timer: (tm, tmr),
             backpressure: false,
+            _exec: PhantomData,
         }
     }
 
@@ -462,7 +469,7 @@ impl Accept {
 
                         let r = self.timer.1.clone();
                         System::current().arbiter().send(Box::pin(async move {
-                            delay_until(Instant::now() + Duration::from_millis(510)).await;
+                            Exec::sleep(Duration::from_millis(510)).await;
                             let _ = r.set_readiness(mio::Ready::readable());
                         }));
                         return;
diff --git a/actix-server/src/builder.rs b/actix-server/src/builder.rs
index 8a90d598..0c4e909f 100644
--- a/actix-server/src/builder.rs
+++ b/actix-server/src/builder.rs
@@ -1,11 +1,11 @@
+use std::marker::PhantomData;
 use std::pin::Pin;
 use std::task::{Context, Poll};
 use std::time::Duration;
 use std::{io, mem, net};
 
 use actix_rt::net::TcpStream;
-use actix_rt::time::{delay_until, Instant};
-use actix_rt::{spawn, System};
+use actix_rt::{DefaultExec, ExecFactory, System};
 use futures_channel::mpsc::{unbounded, UnboundedReceiver};
 use futures_channel::oneshot;
 use futures_util::future::ready;
@@ -21,10 +21,10 @@ use crate::service::{InternalServiceFactory, ServiceFactory, StreamNewService};
 use crate::signals::{Signal, Signals};
 use crate::socket::StdListener;
 use crate::worker::{self, Worker, WorkerAvailability, WorkerClient};
-use crate::Token;
+use crate::{FromStream, Token};
 
 /// Server builder
-pub struct ServerBuilder {
+pub struct ServerBuilder<Exec = DefaultExec> {
     threads: usize,
     token: Token,
     backlog: i32,
@@ -38,6 +38,7 @@ pub struct ServerBuilder {
     cmd: UnboundedReceiver<ServerCommand>,
     server: Server,
     notify: Vec<oneshot::Sender<()>>,
+    _exec: PhantomData<Exec>,
 }
 
 impl Default for ServerBuilder {
@@ -46,9 +47,20 @@ impl Default for ServerBuilder {
     }
 }
 
-impl ServerBuilder {
-    /// Create new Server builder instance
-    pub fn new() -> ServerBuilder {
+impl<Exec> ServerBuilder<Exec>
+where
+    Exec: ExecFactory,
+{
+    /// Create new Server builder instance with default tokio executor.
+    pub fn new() -> Self {
+        ServerBuilder::<DefaultExec>::new_with()
+    }
+
+    /// Create new Server builder instance with a generic executor.
+    pub fn new_with<E>() -> ServerBuilder<E>
+    where
+        E: ExecFactory,
+    {
         let (tx, rx) = unbounded();
         let server = Server::new(tx);
 
@@ -66,6 +78,7 @@ impl ServerBuilder {
             cmd: rx,
             notify: Vec::new(),
             server,
+            _exec: Default::default(),
         }
     }
 
@@ -134,7 +147,7 @@ impl ServerBuilder {
     ///
     /// This function is useful for moving parts of configuration to a
     /// different module or even library.
-    pub fn configure<F>(mut self, f: F) -> io::Result<ServerBuilder>
+    pub fn configure<F>(mut self, f: F) -> io::Result<ServerBuilder<Exec>>
     where
         F: Fn(&mut ServiceConfig) -> io::Result<()>,
     {
@@ -143,7 +156,7 @@ impl ServerBuilder {
         f(&mut cfg)?;
 
         if let Some(apply) = cfg.apply {
-            let mut srv = ConfiguredService::new(apply);
+            let mut srv = ConfiguredService::<Exec>::new(apply);
             for (name, lst) in cfg.services {
                 let token = self.token.next();
                 srv.stream(token, name.clone(), lst.local_addr()?);
@@ -157,16 +170,18 @@ impl ServerBuilder {
     }
 
     /// Add new service to the server.
-    pub fn bind<F, U, N: AsRef<str>>(mut self, name: N, addr: U, factory: F) -> io::Result<Self>
+    pub fn bind<F, U, N, S>(mut self, name: N, addr: U, factory: F) -> io::Result<Self>
     where
-        F: ServiceFactory<TcpStream>,
+        F: ServiceFactory<S>,
         U: net::ToSocketAddrs,
+        N: AsRef<str>,
+        S: FromStream,
     {
         let sockets = bind_addr(addr, self.backlog)?;
 
         for lst in sockets {
             let token = self.token.next();
-            self.services.push(StreamNewService::create(
+            self.services.push(StreamNewService::<_, _, Exec>::create(
                 name.as_ref().to_string(),
                 token,
                 factory.clone(),
@@ -180,11 +195,12 @@ impl ServerBuilder {
 
     #[cfg(all(unix))]
     /// Add new unix domain service to the server.
-    pub fn bind_uds<F, U, N>(self, name: N, addr: U, factory: F) -> io::Result<Self>
+    pub fn bind_uds<F, U, N, S>(self, name: N, addr: U, factory: F) -> io::Result<Self>
     where
-        F: ServiceFactory<actix_rt::net::UnixStream>,
-        N: AsRef<str>,
+        F: ServiceFactory<S>,
         U: AsRef<std::path::Path>,
+        N: AsRef<str>,
+        S: FromStream,
     {
         use std::os::unix::net::UnixListener;
 
@@ -205,19 +221,21 @@ impl ServerBuilder {
     /// Add new unix domain service to the server.
     /// Useful when running as a systemd service and
     /// a socket FD can be acquired using the systemd crate.
-    pub fn listen_uds<F, N: AsRef<str>>(
+    pub fn listen_uds<F, N, S>(
         mut self,
         name: N,
         lst: std::os::unix::net::UnixListener,
         factory: F,
     ) -> io::Result<Self>
     where
-        F: ServiceFactory<actix_rt::net::UnixStream>,
+        F: ServiceFactory<S>,
+        N: AsRef<str>,
+        S: FromStream,
     {
         use std::net::{IpAddr, Ipv4Addr, SocketAddr};
         let token = self.token.next();
         let addr = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
-        self.services.push(StreamNewService::create(
+        self.services.push(StreamNewService::<_, _, Exec>::create(
             name.as_ref().to_string(),
             token,
             factory,
@@ -239,7 +257,7 @@ impl ServerBuilder {
         F: ServiceFactory<TcpStream>,
     {
         let token = self.token.next();
-        self.services.push(StreamNewService::create(
+        self.services.push(StreamNewService::<_, _, Exec>::create(
             name.as_ref().to_string(),
             token,
             factory,
@@ -276,7 +294,7 @@ impl ServerBuilder {
             for sock in &self.sockets {
                 info!("Starting \"{}\" service on {}", sock.1, sock.2);
             }
-            self.accept.start(
+            self.accept.start::<Exec>(
                 mem::take(&mut self.sockets)
                     .into_iter()
                     .map(|t| (t.0, t.2))
@@ -286,12 +304,12 @@ impl ServerBuilder {
 
             // handle signals
             if !self.no_signals {
-                Signals::start(self.server.clone()).unwrap();
+                Signals::<Exec>::start(self.server.clone()).unwrap();
             }
 
             // start http server actor
             let server = self.server.clone();
-            spawn(self);
+            Exec::spawn(self);
             server
         }
     }
@@ -301,7 +319,7 @@ impl ServerBuilder {
         let services: Vec<Box<dyn InternalServiceFactory>> =
             self.services.iter().map(|v| v.clone_factory()).collect();
 
-        Worker::start(idx, services, avail, self.shutdown_timeout)
+        Worker::<Exec>::start(idx, services, avail, self.shutdown_timeout)
     }
 
     fn handle_cmd(&mut self, item: ServerCommand) {
@@ -360,7 +378,7 @@ impl ServerBuilder {
 
                 // stop workers
                 if !self.workers.is_empty() && graceful {
-                    spawn(
+                    Exec::spawn(
                         self.workers
                             .iter()
                             .map(move |worker| worker.1.stop(graceful))
@@ -374,16 +392,10 @@ impl ServerBuilder {
                                     let _ = tx.send(());
                                 }
                                 if exit {
-                                    spawn(
-                                        async {
-                                            delay_until(
-                                                Instant::now() + Duration::from_millis(300),
-                                            )
-                                            .await;
-                                            System::current().stop();
-                                        }
-                                        .boxed(),
-                                    );
+                                    Exec::spawn(async {
+                                        Exec::sleep(Duration::from_millis(300)).await;
+                                        System::current().stop();
+                                    });
                                 }
                                 ready(())
                             }),
@@ -391,14 +403,10 @@ impl ServerBuilder {
                 } else {
                     // we need to stop system if server was spawned
                     if self.exit {
-                        spawn(
-                            delay_until(Instant::now() + Duration::from_millis(300)).then(
-                                |_| {
-                                    System::current().stop();
-                                    ready(())
-                                },
-                            ),
-                        );
+                        Exec::spawn(async {
+                            Exec::sleep(Duration::from_millis(300)).await;
+                            System::current().stop();
+                        });
                     }
                     if let Some(tx) = completion {
                         let _ = tx.send(());
@@ -441,7 +449,10 @@ impl ServerBuilder {
     }
 }
 
-impl Future for ServerBuilder {
+impl<Exec> Future for ServerBuilder<Exec>
+where
+    Exec: ExecFactory,
+{
     type Output = ();
 
     fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
diff --git a/actix-server/src/config.rs b/actix-server/src/config.rs
index fda1ade9..6004290b 100644
--- a/actix-server/src/config.rs
+++ b/actix-server/src/config.rs
@@ -12,6 +12,8 @@ use super::service::{
     BoxedServerService, InternalServiceFactory, ServerMessage, StreamService,
 };
 use super::Token;
+use actix_rt::ExecFactory;
+use std::marker::PhantomData;
 
 pub struct ServiceConfig {
     pub(crate) services: Vec<(String, net::TcpListener)>,
@@ -72,20 +74,22 @@ impl ServiceConfig {
     }
 }
 
-pub(super) struct ConfiguredService {
+pub(super) struct ConfiguredService<Exec> {
     rt: Box<dyn ServiceRuntimeConfiguration>,
     names: HashMap<Token, (String, net::SocketAddr)>,
     topics: HashMap<String, Token>,
     services: Vec<Token>,
+    _exec: PhantomData<Exec>,
 }
 
-impl ConfiguredService {
+impl<Exec> ConfiguredService<Exec> {
     pub(super) fn new(rt: Box<dyn ServiceRuntimeConfiguration>) -> Self {
         ConfiguredService {
             rt,
             names: HashMap::new(),
             topics: HashMap::new(),
             services: Vec::new(),
+            _exec: Default::default(),
         }
     }
 
@@ -96,7 +100,10 @@ impl ConfiguredService {
     }
 }
 
-impl InternalServiceFactory for ConfiguredService {
+impl<Exec> InternalServiceFactory for ConfiguredService<Exec>
+where
+    Exec: ExecFactory,
+{
     fn name(&self, token: Token) -> &str {
         &self.names[&token].0
     }
@@ -107,6 +114,7 @@ impl InternalServiceFactory for ConfiguredService {
             names: self.names.clone(),
             topics: self.topics.clone(),
             services: self.services.clone(),
+            _exec: PhantomData,
         })
     }
 
@@ -142,7 +150,7 @@ impl InternalServiceFactory for ConfiguredService {
                     let name = names.remove(&token).unwrap().0;
                     res.push((
                         token,
-                        Box::new(StreamService::new(actix::fn_service(
+                        Box::new(StreamService::<_, Exec>::new(actix::fn_service(
                             move |_: TcpStream| {
                                 error!("Service {:?} is not configured", name);
                                 ok::<_, ()>(())
@@ -207,20 +215,22 @@ impl ServiceRuntime {
     ///
     /// Name of the service must be registered during configuration stage with
     /// *ServiceConfig::bind()* or *ServiceConfig::listen()* methods.
-    pub fn service<T, F>(&mut self, name: &str, service: F)
+    pub fn service<T, F, Exec>(&mut self, name: &str, service: F)
     where
         F: actix::IntoServiceFactory<T>,
         T: actix::ServiceFactory<Config = (), Request = TcpStream> + 'static,
         T::Future: 'static,
         T::Service: 'static,
         T::InitError: fmt::Debug,
+        Exec: ExecFactory,
     {
         // let name = name.to_owned();
         if let Some(token) = self.names.get(name) {
             self.services.insert(
                 *token,
-                Box::new(ServiceFactory {
+                Box::new(ServiceFactory::<_, Exec> {
                     inner: service.into_factory(),
+                    _exec: PhantomData,
                 }),
             );
         } else {
@@ -249,17 +259,19 @@ type BoxedNewService = Box<
     >,
 >;
 
-struct ServiceFactory<T> {
+struct ServiceFactory<T, Exec> {
     inner: T,
+    _exec: PhantomData<Exec>,
 }
 
-impl<T> actix::ServiceFactory for ServiceFactory<T>
+impl<T, Exec> actix::ServiceFactory for ServiceFactory<T, Exec>
 where
     T: actix::ServiceFactory<Config = (), Request = TcpStream>,
     T::Future: 'static,
     T::Service: 'static,
     T::Error: 'static,
     T::InitError: fmt::Debug + 'static,
+    Exec: ExecFactory,
 {
     type Request = (Option<CounterGuard>, ServerMessage);
     type Response = ();
@@ -273,7 +285,7 @@ where
         let fut = self.inner.new_service(());
         async move {
             match fut.await {
-                Ok(s) => Ok(Box::new(StreamService::new(s)) as BoxedServerService),
+                Ok(s) => Ok(Box::new(StreamService::<_, Exec>::new(s)) as BoxedServerService),
                 Err(e) => {
                     error!("Can not construct service: {:?}", e);
                     Err(())
diff --git a/actix-server/src/lib.rs b/actix-server/src/lib.rs
index 8efc29d3..01f486f6 100644
--- a/actix-server/src/lib.rs
+++ b/actix-server/src/lib.rs
@@ -15,6 +15,7 @@ pub use self::builder::ServerBuilder;
 pub use self::config::{ServiceConfig, ServiceRuntime};
 pub use self::server::Server;
 pub use self::service::ServiceFactory;
+pub use self::socket::StdStream;
 
 #[doc(hidden)]
 pub use self::socket::FromStream;
diff --git a/actix-server/src/server.rs b/actix-server/src/server.rs
index b29a9e02..54930529 100644
--- a/actix-server/src/server.rs
+++ b/actix-server/src/server.rs
@@ -3,6 +3,7 @@ use std::io;
 use std::pin::Pin;
 use std::task::{Context, Poll};
 
+use actix_rt::ExecFactory;
 use futures_channel::mpsc::UnboundedSender;
 use futures_channel::oneshot;
 use futures_util::FutureExt;
@@ -41,6 +42,11 @@ impl Server {
         ServerBuilder::default()
     }
 
+    /// Start server building process with a custom executor
+    pub fn build_with<Exec: ExecFactory>() -> ServerBuilder<Exec> {
+        ServerBuilder::<Exec>::new_with()
+    }
+
     pub(crate) fn signal(&self, sig: Signal) {
         let _ = self.0.unbounded_send(ServerCommand::Signal(sig));
     }
diff --git a/actix-server/src/service.rs b/actix-server/src/service.rs
index 984e5228..77145e2f 100644
--- a/actix-server/src/service.rs
+++ b/actix-server/src/service.rs
@@ -3,7 +3,7 @@ use std::net::SocketAddr;
 use std::task::{Context, Poll};
 use std::time::Duration;
 
-use actix_rt::spawn;
+use actix_rt::ExecFactory;
 use actix_service::{self as actix, Service, ServiceFactory as ActixServiceFactory};
 use actix_utils::counter::CounterGuard;
 use futures_util::future::{err, ok, LocalBoxFuture, Ready};
@@ -48,22 +48,27 @@ pub(crate) type BoxedServerService = Box<
     >,
 >;
 
-pub(crate) struct StreamService<T> {
+pub(crate) struct StreamService<T, Exec> {
     service: T,
+    _exec: PhantomData<Exec>,
 }
 
-impl<T> StreamService<T> {
+impl<T, Exec> StreamService<T, Exec> {
     pub(crate) fn new(service: T) -> Self {
-        StreamService { service }
+        StreamService {
+            service,
+            _exec: PhantomData,
+        }
     }
 }
 
-impl<T, I> Service for StreamService<T>
+impl<T, I, Exec> Service for StreamService<T, Exec>
 where
     T: Service<Request = I>,
     T::Future: 'static,
     T::Error: 'static,
     I: FromStream,
+    Exec: ExecFactory,
 {
     type Request = (Option<CounterGuard>, ServerMessage);
     type Response = ();
@@ -83,7 +88,7 @@ where
 
                 if let Ok(stream) = stream {
                     let f = self.service.call(stream);
-                    spawn(async move {
+                    Exec::spawn(async move {
                         let _ = f.await;
                         drop(guard);
                     });
@@ -97,18 +102,24 @@ where
     }
 }
 
-pub(crate) struct StreamNewService<F: ServiceFactory<Io>, Io: FromStream> {
+pub(crate) struct StreamNewService<F, Io, Exec>
+where
+    F: ServiceFactory<Io>,
+    Io: FromStream,
+    Exec: ExecFactory,
+{
     name: String,
     inner: F,
     token: Token,
     addr: SocketAddr,
-    _t: PhantomData<Io>,
+    _t: PhantomData<(Io, Exec)>,
 }
 
-impl<F, Io> StreamNewService<F, Io>
+impl<F, Io, Exec> StreamNewService<F, Io, Exec>
 where
     F: ServiceFactory<Io>,
     Io: FromStream + Send + 'static,
+    Exec: ExecFactory,
 {
     pub(crate) fn create(
         name: String,
@@ -126,10 +137,11 @@ where
     }
 }
 
-impl<F, Io> InternalServiceFactory for StreamNewService<F, Io>
+impl<F, Io, Exec> InternalServiceFactory for StreamNewService<F, Io, Exec>
 where
     F: ServiceFactory<Io>,
     Io: FromStream + Send + 'static,
+    Exec: ExecFactory,
 {
     fn name(&self, _: Token) -> &str {
         &self.name
@@ -152,7 +164,8 @@ where
             .new_service(())
             .map_err(|_| ())
             .map_ok(move |inner| {
-                let service: BoxedServerService = Box::new(StreamService::new(inner));
+                let service: BoxedServerService =
+                    Box::new(StreamService::<_, Exec>::new(inner));
                 vec![(token, service)]
             })
             .boxed_local()
diff --git a/actix-server/src/signals.rs b/actix-server/src/signals.rs
index b6339621..c531e455 100644
--- a/actix-server/src/signals.rs
+++ b/actix-server/src/signals.rs
@@ -6,6 +6,8 @@ use std::task::{Context, Poll};
 use futures_util::future::lazy;
 
 use crate::server::Server;
+use actix_rt::ExecFactory;
+use std::marker::PhantomData;
 
 /// Different types of process signals
 #[allow(dead_code)]
@@ -21,20 +23,24 @@ pub(crate) enum Signal {
     Quit,
 }
 
-pub(crate) struct Signals {
+pub(crate) struct Signals<Exec> {
     srv: Server,
     #[cfg(not(unix))]
     stream: Pin<Box<dyn Future<Output = io::Result<()>>>>,
     #[cfg(unix)]
     streams: Vec<(Signal, actix_rt::signal::unix::Signal)>,
+    _exec: PhantomData<Exec>,
 }
 
-impl Signals {
+impl<Exec> Signals<Exec>
+where
+    Exec: ExecFactory,
+{
     pub(crate) fn start(srv: Server) -> io::Result<()> {
-        actix_rt::spawn(lazy(|_| {
+        Exec::spawn(lazy(|_| {
             #[cfg(not(unix))]
             {
-                actix_rt::spawn(Signals {
+                Exec::spawn(Signals {
                     srv,
                     stream: Box::pin(actix_rt::signal::ctrl_c()),
                 });
@@ -63,7 +69,11 @@ impl Signals {
                     }
                 }
 
-                actix_rt::spawn(Signals { srv, streams })
+                Exec::spawn(Self {
+                    srv,
+                    streams,
+                    _exec: PhantomData,
+                })
             }
         }));
 
@@ -71,7 +81,10 @@ impl Signals {
     }
 }
 
-impl Future for Signals {
+impl<Exec> Future for Signals<Exec>
+where
+    Exec: Unpin,
+{
     type Output = ();
 
     fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
diff --git a/actix-server/src/socket.rs b/actix-server/src/socket.rs
index 3025660a..7155f9dd 100644
--- a/actix-server/src/socket.rs
+++ b/actix-server/src/socket.rs
@@ -1,6 +1,5 @@
 use std::{fmt, io, net};
 
-use actix_codec::{AsyncRead, AsyncWrite};
 use actix_rt::net::TcpStream;
 
 pub(crate) enum StdListener {
@@ -143,7 +142,7 @@ impl mio::Evented for SocketListener {
     }
 }
 
-pub trait FromStream: AsyncRead + AsyncWrite + Sized {
+pub trait FromStream: Sized + Send + 'static {
     fn from_stdstream(sock: StdStream) -> io::Result<Self>;
 }
 
diff --git a/actix-server/src/worker.rs b/actix-server/src/worker.rs
index 35331757..7528ee28 100644
--- a/actix-server/src/worker.rs
+++ b/actix-server/src/worker.rs
@@ -1,11 +1,11 @@
+use std::marker::PhantomData;
 use std::pin::Pin;
 use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
 use std::sync::Arc;
 use std::task::{Context, Poll};
 use std::time;
 
-use actix_rt::time::{delay_until, Delay, Instant};
-use actix_rt::{spawn, Arbiter};
+use actix_rt::{Arbiter, ExecFactory};
 use actix_utils::counter::Counter;
 use futures_channel::mpsc::{unbounded, UnboundedReceiver, UnboundedSender};
 use futures_channel::oneshot;
@@ -125,15 +125,19 @@ impl WorkerAvailability {
 ///
 /// Worker accepts Socket objects via unbounded channel and starts stream
 /// processing.
-pub(crate) struct Worker {
+pub(crate) struct Worker<Exec>
+where
+    Exec: ExecFactory,
+{
     rx: UnboundedReceiver<WorkerCommand>,
     rx2: UnboundedReceiver<StopCommand>,
     services: Vec<WorkerService>,
     availability: WorkerAvailability,
     conns: Counter,
     factories: Vec<Box<dyn InternalServiceFactory>>,
-    state: WorkerState,
+    state: WorkerState<Exec>,
     shutdown_timeout: time::Duration,
+    _exec: PhantomData<Exec>,
 }
 
 struct WorkerService {
@@ -159,7 +163,10 @@ enum WorkerServiceStatus {
     Stopped,
 }
 
-impl Worker {
+impl<Exec> Worker<Exec>
+where
+    Exec: ExecFactory,
+{
     pub(crate) fn start(
         idx: usize,
         factories: Vec<Box<dyn InternalServiceFactory>>,
@@ -170,10 +177,10 @@ impl Worker {
         let (tx2, rx2) = unbounded();
         let avail = availability.clone();
 
-        Arbiter::new().send(
+        Arbiter::new_with::<Exec>().send(
             async move {
                 availability.set(false);
-                let mut wrk = MAX_CONNS_COUNTER.with(move |conns| Worker {
+                let mut wrk: Worker<Exec> = MAX_CONNS_COUNTER.with(move |conns| Worker {
                     rx,
                     rx2,
                     availability,
@@ -182,6 +189,7 @@ impl Worker {
                     services: Vec::new(),
                     conns: conns.clone(),
                     state: WorkerState::Unavailable(Vec::new()),
+                    _exec: PhantomData,
                 });
 
                 let mut fut: Vec<MapOk<LocalBoxFuture<'static, _>, _>> = Vec::new();
@@ -193,7 +201,7 @@ impl Worker {
                     }));
                 }
 
-                spawn(async move {
+                Exec::spawn(async move {
                     let res = join_all(fut).await;
                     let res: Result<Vec<_>, _> = res.into_iter().collect();
                     match res {
@@ -228,7 +236,7 @@ impl Worker {
             self.services.iter_mut().for_each(|srv| {
                 if srv.status == WorkerServiceStatus::Available {
                     srv.status = WorkerServiceStatus::Stopped;
-                    actix_rt::spawn(
+                    Exec::spawn(
                         srv.service
                             .call((None, ServerMessage::ForceShutdown))
                             .map(|_| ()),
@@ -240,7 +248,7 @@ impl Worker {
             self.services.iter_mut().for_each(move |srv| {
                 if srv.status == WorkerServiceStatus::Available {
                     srv.status = WorkerServiceStatus::Stopping;
-                    actix_rt::spawn(
+                    Exec::spawn(
                         srv.service
                             .call((None, ServerMessage::Shutdown(timeout)))
                             .map(|_| ()),
@@ -297,7 +305,7 @@ impl Worker {
     }
 }
 
-enum WorkerState {
+enum WorkerState<Exec: ExecFactory> {
     Available,
     Unavailable(Vec<Conn>),
     Restarting(
@@ -306,14 +314,13 @@ enum WorkerState {
         #[allow(clippy::type_complexity)]
         Pin<Box<dyn Future<Output = Result<Vec<(Token, BoxedServerService)>, ()>>>>,
     ),
-    Shutdown(
-        Pin<Box<Delay>>,
-        Pin<Box<Delay>>,
-        Option<oneshot::Sender<bool>>,
-    ),
+    Shutdown(Exec::Sleep, Exec::Sleep, Option<oneshot::Sender<bool>>),
 }
 
-impl Future for Worker {
+impl<Exec> Future for Worker<Exec>
+where
+    Exec: ExecFactory,
+{
     type Output = ();
 
     // FIXME: remove this attribute
@@ -335,8 +342,8 @@ impl Future for Worker {
                 if num != 0 {
                     info!("Graceful worker shutdown, {} connections", num);
                     self.state = WorkerState::Shutdown(
-                        Box::pin(delay_until(Instant::now() + time::Duration::from_secs(1))),
-                        Box::pin(delay_until(Instant::now() + self.shutdown_timeout)),
+                        Exec::sleep(time::Duration::from_secs(1)),
+                        Exec::sleep(self.shutdown_timeout),
                         Some(result),
                     );
                 } else {
@@ -423,31 +430,24 @@ impl Future for Worker {
                 }
 
                 // check graceful timeout
-                match t2.as_mut().poll(cx) {
-                    Poll::Pending => (),
-                    Poll::Ready(_) => {
-                        let _ = tx.take().unwrap().send(false);
-                        self.shutdown(true);
-                        Arbiter::current().stop();
-                        return Poll::Ready(());
-                    }
+                if Pin::new(t2).poll(cx).is_ready() {
+                    let _ = tx.take().unwrap().send(false);
+                    self.shutdown(true);
+                    Arbiter::current().stop();
+                    return Poll::Ready(());
                 }
 
                 // sleep for 1 second and then check again
-                match t1.as_mut().poll(cx) {
-                    Poll::Pending => (),
-                    Poll::Ready(_) => {
-                        *t1 = Box::pin(delay_until(
-                            Instant::now() + time::Duration::from_secs(1),
-                        ));
-                        let _ = t1.as_mut().poll(cx);
-                    }
+                if Pin::new(&mut *t1).poll(cx).is_ready() {
+                    *t1 = Exec::sleep(time::Duration::from_secs(1));
+                    let _ = Pin::new(t1).poll(cx);
                 }
+
                 Poll::Pending
             }
             WorkerState::Available => {
                 loop {
-                    match Pin::new(&mut self.rx).poll_next(cx) {
+                    return match Pin::new(&mut self.rx).poll_next(cx) {
                         // handle incoming io stream
                         Poll::Ready(Some(WorkerCommand(msg))) => {
                             match self.check_readiness(cx) {
@@ -478,14 +478,14 @@ impl Future for Worker {
                                     );
                                 }
                             }
-                            return self.poll(cx);
+                            self.poll(cx)
                         }
                         Poll::Pending => {
                             self.state = WorkerState::Available;
-                            return Poll::Pending;
+                            Poll::Pending
                         }
-                        Poll::Ready(None) => return Poll::Ready(()),
-                    }
+                        Poll::Ready(None) => Poll::Ready(()),
+                    };
                 }
             }
         }
diff --git a/actix-server/tests/test_server.rs b/actix-server/tests/test_server.rs
index 838c3cf1..26a682eb 100644
--- a/actix-server/tests/test_server.rs
+++ b/actix-server/tests/test_server.rs
@@ -2,10 +2,12 @@ use std::sync::atomic::{AtomicUsize, Ordering::Relaxed};
 use std::sync::{mpsc, Arc};
 use std::{net, thread, time};
 
+use actix_rt::DefaultExec;
 use actix_server::Server;
 use actix_service::fn_service;
 use futures_util::future::{lazy, ok};
 use socket2::{Domain, Protocol, Socket, Type};
+use tokio::net::TcpStream;
 
 fn unused_addr() -> net::SocketAddr {
     let addr: net::SocketAddr = "127.0.0.1:0".parse().unwrap();
@@ -28,7 +30,9 @@ fn test_bind() {
             Server::build()
                 .workers(1)
                 .disable_signals()
-                .bind("test", addr, move || fn_service(|_| ok::<_, ()>(())))
+                .bind("test", addr, move || {
+                    fn_service(|_: TcpStream| ok::<_, ()>(()))
+                })
                 .unwrap()
                 .start()
         }));
@@ -165,8 +169,14 @@ fn test_configure() {
                         .listen("addr3", lst)
                         .apply(move |rt| {
                             let num = num.clone();
-                            rt.service("addr1", fn_service(|_| ok::<_, ()>(())));
-                            rt.service("addr3", fn_service(|_| ok::<_, ()>(())));
+                            rt.service::<_, _, DefaultExec>(
+                                "addr1",
+                                fn_service(|_| ok::<_, ()>(())),
+                            );
+                            rt.service::<_, _, DefaultExec>(
+                                "addr3",
+                                fn_service(|_| ok::<_, ()>(())),
+                            );
                             rt.on_start(lazy(move |_| {
                                 let _ = num.fetch_add(1, Relaxed);
                             }))