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    use bytes::Buf;
    use h2::SendStream;
    use http::header::{
        HeaderName, CONNECTION, PROXY_AUTHENTICATE, PROXY_AUTHORIZATION, TE, TRAILER,
        TRANSFER_ENCODING, UPGRADE,
    };
    use http::HeaderMap;
    use pin_project::pin_project;
    use std::error::Error as StdError;
    use std::io::IoSlice;

    use crate::body::{DecodedLength, HttpBody};
    use crate::common::{task, Future, Pin, Poll};
    use crate::headers::content_length_parse_all;

    pub(crate) mod ping;

    cfg_client! {
        pub(crate) mod client;
        pub(crate) use self::client::ClientTask;
    }

    cfg_server! {
        pub(crate) mod server;
        pub(crate) use self::server::Server;
    }

    /// Default initial stream window size defined in HTTP2 spec.
    pub(crate) const SPEC_WINDOW_SIZE: u32 = 65_535;

    fn strip_connection_headers(headers: &mut HeaderMap, is_request: bool) {
        // List of connection headers from:
        // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Connection
        //
        // TE headers are allowed in HTTP/2 requests as long as the value is "trailers", so they're
        // tested separately.
        let connection_headers = [
            HeaderName::from_lowercase(b"keep-alive").unwrap(),
            HeaderName::from_lowercase(b"proxy-connection").unwrap(),
            PROXY_AUTHENTICATE,
            PROXY_AUTHORIZATION,
            TRAILER,
            TRANSFER_ENCODING,
            UPGRADE,
        ];

        for header in connection_headers.iter() {
            if headers.remove(header).is_some() {
                warn!("Connection header illegal in HTTP/2: {}", header.as_str());
            }
        }

        if is_request {
            if headers
                .get(TE)
                .map(|te_header| te_header != "trailers")
                .unwrap_or(false)
            {
                warn!("TE headers not set to \"trailers\" are illegal in HTTP/2 requests");
                headers.remove(TE);
            }
        } else if headers.remove(TE).is_some() {
            warn!("TE headers illegal in HTTP/2 responses");
        }

        if let Some(header) = headers.remove(CONNECTION) {
            warn!(
                "Connection header illegal in HTTP/2: {}",
                CONNECTION.as_str()
            );
            let header_contents = header.to_str().unwrap();

            // A `Connection` header may have a comma-separated list of names of other headers that
            // are meant for only this specific connection.
            //
            // Iterate these names and remove them as headers. Connection-specific headers are
            // forbidden in HTTP2, as that information has been moved into frame types of the h2
            // protocol.
            for name in header_contents.split(',') {
                let name = name.trim();
                headers.remove(name);
            }
        }
    }

    fn decode_content_length(headers: &HeaderMap) -> DecodedLength {
        if let Some(len) = content_length_parse_all(headers) {
            // If the length is u64::MAX, oh well, just reported chunked.
            DecodedLength::checked_new(len).unwrap_or_else(|_| DecodedLength::CHUNKED)
        } else {
            DecodedLength::CHUNKED
        }
    }

    // body adapters used by both Client and Server

    #[pin_project]
    struct PipeToSendStream<S>
    where
        S: HttpBody,
    {
        body_tx: SendStream<SendBuf<S::Data>>,
        data_done: bool,
        #[pin]
        stream: S,
    }

    impl<S> PipeToSendStream<S>
    where
        S: HttpBody,
    {
        fn new(stream: S, tx: SendStream<SendBuf<S::Data>>) -> PipeToSendStream<S> {
            PipeToSendStream {
                body_tx: tx,
                data_done: false,
                stream,
            }
        }
    }

    impl<S> Future for PipeToSendStream<S>
    where
        S: HttpBody,
        S::Error: Into<Box<dyn StdError + Send + Sync>>,
    {
        type Output = crate::Result<()>;

        fn poll(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<Self::Output> {
            let mut me = self.project();
            loop {
                if !*me.data_done {
                    // we don't have the next chunk of data yet, so just reserve 1 byte to make
                    // sure there's some capacity available. h2 will handle the capacity management
                    // for the actual body chunk.
                    me.body_tx.reserve_capacity(1);

                    if me.body_tx.capacity() == 0 {
                        loop {
                            match ready!(me.body_tx.poll_capacity(cx)) {
                                Some(Ok(0)) => {}
                                Some(Ok(_)) => break,
                                Some(Err(e)) => {
                                    return Poll::Ready(Err(crate::Error::new_body_write(e)))
                                }
                                None => {
                                    // None means the stream is no longer in a
                                    // streaming state, we either finished it
                                    // somehow, or the remote reset us.
                                    return Poll::Ready(Err(crate::Error::new_body_write(
                                        "send stream capacity unexpectedly closed",
                                    )));
                                }
                            }
                        }
                    } else if let Poll::Ready(reason) = me
                        .body_tx
                        .poll_reset(cx)
                        .map_err(crate::Error::new_body_write)?
                    {
                        debug!("stream received RST_STREAM: {:?}", reason);
                        return Poll::Ready(Err(crate::Error::new_body_write(::h2::Error::from(
                            reason,
                        ))));
                    }

                    match ready!(me.stream.as_mut().poll_data(cx)) {
                        Some(Ok(chunk)) => {
                            let is_eos = me.stream.is_end_stream();
                            trace!(
                                "send body chunk: {} bytes, eos={}",
                                chunk.remaining(),
                                is_eos,
                            );

                            let buf = SendBuf(Some(chunk));
                            me.body_tx
                                .send_data(buf, is_eos)
                                .map_err(crate::Error::new_body_write)?;

                            if is_eos {
                                return Poll::Ready(Ok(()));
                            }
                        }
                        Some(Err(e)) => return Poll::Ready(Err(me.body_tx.on_user_err(e))),
                        None => {
                            me.body_tx.reserve_capacity(0);
                            let is_eos = me.stream.is_end_stream();
                            if is_eos {
                                return Poll::Ready(me.body_tx.send_eos_frame());
                            } else {
                                *me.data_done = true;
                                // loop again to poll_trailers
                            }
                        }
                    }
                } else {
                    if let Poll::Ready(reason) = me
                        .body_tx
                        .poll_reset(cx)
                        .map_err(crate::Error::new_body_write)?
                    {
                        debug!("stream received RST_STREAM: {:?}", reason);
                        return Poll::Ready(Err(crate::Error::new_body_write(::h2::Error::from(
                            reason,
                        ))));
                    }

                    match ready!(me.stream.poll_trailers(cx)) {
                        Ok(Some(trailers)) => {
                            me.body_tx
                                .send_trailers(trailers)
                                .map_err(crate::Error::new_body_write)?;
                            return Poll::Ready(Ok(()));
                        }
                        Ok(None) => {
                            // There were no trailers, so send an empty DATA frame...
                            return Poll::Ready(me.body_tx.send_eos_frame());
                        }
                        Err(e) => return Poll::Ready(Err(me.body_tx.on_user_err(e))),
                    }
                }
            }
        }
    }

    trait SendStreamExt {
        fn on_user_err<E>(&mut self, err: E) -> crate::Error
        where
            E: Into<Box<dyn std::error::Error + Send + Sync>>;
        fn send_eos_frame(&mut self) -> crate::Result<()>;
    }

    impl<B: Buf> SendStreamExt for SendStream<SendBuf<B>> {
        fn on_user_err<E>(&mut self, err: E) -> crate::Error
        where
            E: Into<Box<dyn std::error::Error + Send + Sync>>,
        {
            let err = crate::Error::new_user_body(err);
            debug!("send body user stream error: {}", err);
            self.send_reset(err.h2_reason());
            err
        }

        fn send_eos_frame(&mut self) -> crate::Result<()> {
            trace!("send body eos");
            self.send_data(SendBuf(None), true)
                .map_err(crate::Error::new_body_write)
        }
    }

    struct SendBuf<B>(Option<B>);

    impl<B: Buf> Buf for SendBuf<B> {
        #[inline]
        fn remaining(&self) -> usize {
            self.0.as_ref().map(|b| b.remaining()).unwrap_or(0)
        }

        #[inline]
        fn chunk(&self) -> &[u8] {
            self.0.as_ref().map(|b| b.chunk()).unwrap_or(&[])
        }

        #[inline]
        fn advance(&mut self, cnt: usize) {
            if let Some(b) = self.0.as_mut() {
                b.advance(cnt)
            }
        }

        fn chunks_vectored<'a>(&'a self, dst: &mut [IoSlice<'a>]) -> usize {
            self.0.as_ref().map(|b| b.chunks_vectored(dst)).unwrap_or(0)
        }
    }