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    //! Http server module
    //!
    //! The module contains everything necessary to setup
    //! HTTP server.
    //!
    //! In order to start HTTP server, first you need to create and configure it
    //! using factory that can be supplied to [new](fn.new.html).
    //!
    //! ## Factory
    //!
    //! Factory is a function that returns Application, describing how
    //! to serve incoming HTTP requests.
    //!
    //! As the server uses worker pool, the factory function is restricted to trait bounds
    //! `Send + Clone + 'static` so that each worker would be able to accept Application
    //! without a need for synchronization.
    //!
    //! If you wish to share part of state among all workers you should
    //! wrap it in `Arc` and potentially synchronization primitive like
    //! [RwLock](https://doc.rust-lang.org/std/sync/struct.RwLock.html)
    //! If the wrapped type is not thread safe.
    //!
    //! Note though that locking is not advisable for asynchronous programming
    //! and you should minimize all locks in your request handlers
    //!
    //! ## HTTPS Support
    //!
    //! Actix-web provides support for major crates that provides TLS.
    //! Each TLS implementation is provided with [AcceptorService](trait.AcceptorService.html)
    //! that describes how HTTP Server accepts connections.
    //!
    //! For `bind` and `listen` there are corresponding `bind_ssl|tls|rustls` and `listen_ssl|tls|rustls` that accepts
    //! these services.
    //!
    //! **NOTE:** `native-tls` doesn't support `HTTP2` yet
    //!
    //! ## Signal handling and shutdown
    //!
    //! By default HTTP Server listens for system signals
    //! and, gracefully shuts down at most after 30 seconds.
    //!
    //! Both signal handling and shutdown timeout can be controlled
    //! using corresponding methods.
    //!
    //! If worker, for some reason, unable to shut down within timeout
    //! it is forcibly dropped.
    //!
    //! ## Example
    //!
    //! ```rust,ignore
    //!extern crate actix;
    //!extern crate actix_web;
    //!extern crate rustls;
    //!
    //!use actix_web::{http, middleware, server, App, Error, HttpRequest, HttpResponse, Responder};
    //!use std::io::BufReader;
    //!use rustls::internal::pemfile::{certs, rsa_private_keys};
    //!use rustls::{NoClientAuth, ServerConfig};
    //!
    //!fn index(req: &HttpRequest) -> Result<HttpResponse, Error> {
    //!    Ok(HttpResponse::Ok().content_type("text/plain").body("Welcome!"))
    //!}
    //!
    //!fn load_ssl() -> ServerConfig {
    //!    use std::io::BufReader;
    //!
    //!    const CERT: &'static [u8] = include_bytes!("../cert.pem");
    //!    const KEY: &'static [u8] = include_bytes!("../key.pem");
    //!
    //!    let mut cert = BufReader::new(CERT);
    //!    let mut key = BufReader::new(KEY);
    //!
    //!    let mut config = ServerConfig::new(NoClientAuth::new());
    //!    let cert_chain = certs(&mut cert).unwrap();
    //!    let mut keys = rsa_private_keys(&mut key).unwrap();
    //!    config.set_single_cert(cert_chain, keys.remove(0)).unwrap();
    //!
    //!    config
    //!}
    //!
    //!fn main() {
    //!    let sys = actix::System::new("http-server");
    //!    // load ssl keys
    //!    let config = load_ssl();
    //!
    //!     // create and start server at once
    //!     server::new(|| {
    //!         App::new()
    //!             // register simple handler, handle all methods
    //!             .resource("/index.html", |r| r.f(index))
    //!             }))
    //!     }).bind_rustls("127.0.0.1:8443", config)
    //!     .unwrap()
    //!     .start();
    //!
    //!     println!("Started http server: 127.0.0.1:8080");
    //!     //Run system so that server would start accepting connections
    //!     let _ = sys.run();
    //!}
    //! ```
    use std::net::{Shutdown, SocketAddr};
    use std::rc::Rc;
    use std::{io, time};

    use bytes::{BufMut, BytesMut};
    use futures::{Async, Poll};
    use tokio_io::{AsyncRead, AsyncWrite};
    use tokio_tcp::TcpStream;

    pub use actix_net::server::{PauseServer, ResumeServer, StopServer};

    pub(crate) mod acceptor;
    pub(crate) mod builder;
    mod channel;
    mod error;
    pub(crate) mod h1;
    pub(crate) mod h1decoder;
    mod h1writer;
    mod h2;
    mod h2writer;
    mod handler;
    pub(crate) mod helpers;
    mod http;
    pub(crate) mod incoming;
    pub(crate) mod input;
    pub(crate) mod message;
    pub(crate) mod output;
    pub(crate) mod service;
    pub(crate) mod settings;
    mod ssl;

    pub use self::handler::*;
    pub use self::http::HttpServer;
    pub use self::message::Request;
    pub use self::ssl::*;

    pub use self::error::{AcceptorError, HttpDispatchError};
    pub use self::settings::ServerSettings;

    #[doc(hidden)]
    pub use self::acceptor::AcceptorTimeout;

    #[doc(hidden)]
    pub use self::settings::{ServiceConfig, ServiceConfigBuilder};

    #[doc(hidden)]
    pub use self::service::{H1Service, HttpService, StreamConfiguration};

    #[doc(hidden)]
    pub use self::helpers::write_content_length;

    use body::Binary;
    use extensions::Extensions;
    use header::ContentEncoding;
    use httpresponse::HttpResponse;

    /// max buffer size 64k
    pub(crate) const MAX_WRITE_BUFFER_SIZE: usize = 65_536;

    const LW_BUFFER_SIZE: usize = 4096;
    const HW_BUFFER_SIZE: usize = 32_768;

    /// Create new http server with application factory.
    ///
    /// This is shortcut for `server::HttpServer::new()` method.
    ///
    /// ```rust
    /// # extern crate actix_web;
    /// use actix_web::{actix, server, App, HttpResponse};
    ///
    /// fn main() {
    ///     let sys = actix::System::new("example");  // <- create Actix system
    ///
    ///     server::new(
    ///         || App::new()
    ///             .resource("/", |r| r.f(|_| HttpResponse::Ok())))
    ///         .bind("127.0.0.1:59090").unwrap()
    ///         .start();
    ///
    /// #       actix::System::current().stop();
    ///     sys.run();
    /// }
    /// ```
    pub fn new<F, H>(factory: F) -> HttpServer<H, F>
    where
        F: Fn() -> H + Send + Clone + 'static,
        H: IntoHttpHandler + 'static,
    {
        HttpServer::new(factory)
    }

    #[doc(hidden)]
    bitflags! {
        ///Flags that can be used to configure HTTP Server.
        pub struct ServerFlags: u8 {
            ///Use HTTP1 protocol
            const HTTP1 = 0b0000_0001;
            ///Use HTTP2 protocol
            const HTTP2 = 0b0000_0010;
        }
    }

    #[derive(Debug, PartialEq, Clone, Copy)]
    /// Server keep-alive setting
    pub enum KeepAlive {
        /// Keep alive in seconds
        Timeout(usize),
        /// Use `SO_KEEPALIVE` socket option, value in seconds
        Tcp(usize),
        /// Relay on OS to shutdown tcp connection
        Os,
        /// Disabled
        Disabled,
    }

    impl From<usize> for KeepAlive {
        fn from(keepalive: usize) -> Self {
            KeepAlive::Timeout(keepalive)
        }
    }

    impl From<Option<usize>> for KeepAlive {
        fn from(keepalive: Option<usize>) -> Self {
            if let Some(keepalive) = keepalive {
                KeepAlive::Timeout(keepalive)
            } else {
                KeepAlive::Disabled
            }
        }
    }

    #[doc(hidden)]
    #[derive(Debug)]
    pub enum WriterState {
        Done,
        Pause,
    }

    #[doc(hidden)]
    /// Stream writer
    pub trait Writer {
        /// number of bytes written to the stream
        fn written(&self) -> u64;

        #[doc(hidden)]
        fn set_date(&mut self);

        #[doc(hidden)]
        fn buffer(&mut self) -> &mut BytesMut;

        fn start(
            &mut self, req: &Request, resp: &mut HttpResponse, encoding: ContentEncoding,
        ) -> io::Result<WriterState>;

        fn write(&mut self, payload: &Binary) -> io::Result<WriterState>;

        fn write_eof(&mut self) -> io::Result<WriterState>;

        fn poll_completed(&mut self, shutdown: bool) -> Poll<(), io::Error>;
    }

    #[doc(hidden)]
    /// Low-level io stream operations
    pub trait IoStream: AsyncRead + AsyncWrite + 'static {
        fn shutdown(&mut self, how: Shutdown) -> io::Result<()>;

        /// Returns the socket address of the remote peer of this TCP connection.
        fn peer_addr(&self) -> Option<SocketAddr> {
            None
        }

        /// Sets the value of the TCP_NODELAY option on this socket.
        fn set_nodelay(&mut self, nodelay: bool) -> io::Result<()>;

        fn set_linger(&mut self, dur: Option<time::Duration>) -> io::Result<()>;

        fn set_keepalive(&mut self, dur: Option<time::Duration>) -> io::Result<()>;

        fn read_available(&mut self, buf: &mut BytesMut) -> Poll<(bool, bool), io::Error> {
            let mut read_some = false;
            loop {
                if buf.remaining_mut() < LW_BUFFER_SIZE {
                    buf.reserve(HW_BUFFER_SIZE);
                }

                let read = unsafe { self.read(buf.bytes_mut()) };
                match read {
                    Ok(n) => {
                        if n == 0 {
                            return Ok(Async::Ready((read_some, true)));
                        } else {
                            read_some = true;
                            unsafe {
                                buf.advance_mut(n);
                            }
                        }
                    }
                    Err(e) => {
                        return if e.kind() == io::ErrorKind::WouldBlock {
                            if read_some {
                                Ok(Async::Ready((read_some, false)))
                            } else {
                                Ok(Async::NotReady)
                            }
                        } else {
                            Err(e)
                        };
                    }
                }
            }
        }

        /// Extra io stream extensions
        fn extensions(&self) -> Option<Rc<Extensions>> {
            None
        }
    }

    #[cfg(all(unix, feature = "uds"))]
    impl IoStream for ::tokio_uds::UnixStream {
        #[inline]
        fn shutdown(&mut self, how: Shutdown) -> io::Result<()> {
            ::tokio_uds::UnixStream::shutdown(self, how)
        }

        #[inline]
        fn set_nodelay(&mut self, _nodelay: bool) -> io::Result<()> {
            Ok(())
        }

        #[inline]
        fn set_linger(&mut self, _dur: Option<time::Duration>) -> io::Result<()> {
            Ok(())
        }

        #[inline]
        fn set_keepalive(&mut self, _nodelay: bool) -> io::Result<()> {
            Ok(())
        }
    }

    impl IoStream for TcpStream {
        #[inline]
        fn shutdown(&mut self, how: Shutdown) -> io::Result<()> {
            TcpStream::shutdown(self, how)
        }

        #[inline]
        fn peer_addr(&self) -> Option<SocketAddr> {
            TcpStream::peer_addr(self).ok()
        }

        #[inline]
        fn set_nodelay(&mut self, nodelay: bool) -> io::Result<()> {
            TcpStream::set_nodelay(self, nodelay)
        }

        #[inline]
        fn set_linger(&mut self, dur: Option<time::Duration>) -> io::Result<()> {
            TcpStream::set_linger(self, dur)
        }

        #[inline]
        fn set_keepalive(&mut self, dur: Option<time::Duration>) -> io::Result<()> {
            TcpStream::set_keepalive(self, dur)
        }
    }

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