Function tcp_connect 

pub async fn tcp_connect<Dns, Connector>(
    extensions: &Extensions,
    address: HostWithPort,
    dns: Dns,
    connector: Connector,
    exec: Executor,
) -> Result<(TcpStream, SocketAddr), Box<dyn Error + Sync + Send>>
where
    Dns: DnsAddressResolver,
    Connector: TcpStreamConnector + Clone,
    <Connector as TcpStreamConnector>::Error: Into<Box<dyn Error + Sync + Send>> + Send + 'static,

Available on crate feature tcp only.

Establish a TcpStream connection for the given HostWithPort.

IPv4-mapped IPv6 addresses (::ffff:a.b.c.d) — whether given as an IP literal host or resolved from AAAA records — are canonicalized to the embedded IPv4 address, as they identify IPv4 wire traffic.