You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: connection.rs
    path of file: ./repos/actix-web/awc/src/client
    
    the code of the file until where you have to start completion: use std::{
    io,
    ops::{Deref, DerefMut},
    pin::Pin,
    task::{Context, Poll},
    time,
};

use actix_codec::{AsyncRead, AsyncWrite, Framed, ReadBuf};
use actix_http::{body::MessageBody, h1::ClientCodec, Payload, RequestHeadType, ResponseHead};
use actix_rt::task::JoinHandle;
use bytes::Bytes;
use futures_core::future::LocalBoxFuture;
use h2::client::SendRequest;

use super::{error::SendRequestError, h1proto, h2proto, pool::Acquired};
use crate::BoxError;

/// Trait alias for types impl [tokio::io::AsyncRead] and [tokio::io::AsyncWrite].
pub trait ConnectionIo: AsyncRead + AsyncWrite + Unpin + 'static {}

impl<T: AsyncRead + AsyncWrite + Unpin + 'static> ConnectionIo for T {}

/// HTTP client connection
pub struct H1Connection<Io: ConnectionIo> {
    io: Option<Io>,
    created: time::Instant,
    acquired: Acquired<Io>,
}

impl<Io: ConnectionIo> H1Connection<Io> {
    
    
    async fn test_h2_connection_drop() {
        env_logger::try_init().ok();

        let addr = "127.0.0.1:0".parse::<net::SocketAddr>().unwrap();
        let listener = net::TcpListener::bind(addr).unwrap();
        let local = listener.local_addr().unwrap();

        std::thread::spawn(move || while listener.accept().is_ok() {});

        let tcp = TcpStream::connect(local).await.unwrap();
        let (sender, connection) = h2::client::handshake(tcp).await.unwrap();
        let conn = H2ConnectionInner::new(sender.clone(), connection);

        assert!(sender.clone().ready().await.is_ok());
        assert!(h2::client::SendRequest::clone(&conn.sender)
            .ready()
            .await
            .is_ok());

        drop(conn);

        struct DropCheck {
            sender: h2::client::SendRequest<Bytes>,
            interval: Interval,
            start_from: Instant,
        }

        impl Future for DropCheck {
            type Output = ();

            fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
                let this = self.get_mut();
                match futures_core::ready!(this.sender.poll_ready(cx)) {
                    Ok(()) => {
                        if this.start_from.elapsed() > Duration::from_secs(10) {
                            panic!("connection should be gone and can not be ready");
                        } else {
                            match this.interval.poll_tick(cx) {
                                Poll::Ready(_) => {
                                    // prevents spurious test hang
                                    this.interval.reset();

                                    Poll::Pending
                                }
                                Poll::Pending => Poll::Pending,
                            }
                        }
                    }
                    Err(_) => Poll::Ready(()),
                }
            }
        }

        DropCheck {
            sender,
            interval: interval(Duration::from_millis(100)),
            start_from: Instant::now(),
        }
        .await;
    }