diff --git a/src/main.rs b/src/main.rs
index 939fb1c..65e4ba2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -26,7 +26,7 @@ use tokio::net::TcpStream;
 use tokio_rustls::rustls::server::DnsName;
 use tokio_rustls::rustls::{Certificate, PrivateKey, ServerName};
 
-use tracing::{debug, error, field, instrument, Instrument, Span};
+use tracing::{debug, error, instrument, Instrument, Span};
 
 use tracing_subscriber::EnvFilter;
 use url::{Host, Url};
@@ -572,7 +572,7 @@ async fn main() {
     tokio::signal::ctrl_c().await.unwrap();
 }
 
-#[instrument(name="tunnel", level="info", skip_all, fields(id=field::Empty, remote=field::Empty))]
+#[instrument(name="tunnel", level="info", skip_all, fields(id=tracing::field::Empty, remote=tracing::field::Empty))]
 async fn run_tunnel<T, R, W>(
     server_config: Arc<WsClientConfig>,
     tunnel: LocalToRemote,
diff --git a/src/tcp.rs b/src/tcp.rs
index b248a23..3014d1e 100644
--- a/src/tcp.rs
+++ b/src/tcp.rs
@@ -2,7 +2,6 @@ use anyhow::{anyhow, Context};
 use std::{io, vec};
 
 use std::net::{SocketAddr, SocketAddrV4, SocketAddrV6};
-use std::os::fd::AsRawFd;
 use std::time::Duration;
 use tokio::net::{TcpListener, TcpSocket, TcpStream};
 use tokio::time::timeout;
@@ -21,6 +20,7 @@ fn configure_socket(socket: &mut TcpSocket, so_mark: &Option<i32>) -> Result<(),
 
     #[cfg(target_os = "linux")]
     if let Some(so_mark) = so_mark {
+        use std::os::fd::AsRawFd;
         unsafe {
             let optval: libc::c_int = *so_mark;
             let ret = libc::setsockopt(
diff --git a/src/transport.rs b/src/transport.rs
index e176805..ff07bd6 100644
--- a/src/transport.rs
+++ b/src/transport.rs
@@ -1,8 +1,5 @@
-#![allow(unused_imports)]
-
 use std::collections::HashSet;
 use std::future::Future;
-use std::net::Ipv4Addr;
 use std::ops::{Deref, Not};
 use std::pin::Pin;
 use std::sync::Arc;
@@ -10,12 +7,11 @@ use std::time::Duration;
 
 use crate::{tcp, tls, L4Protocol, LocalToRemote, WsClientConfig, WsServerConfig};
 use anyhow::Context;
-use fastwebsockets::upgrade::UpgradeFut;
 use fastwebsockets::{
     Frame, OpCode, Payload, WebSocket, WebSocketError, WebSocketRead, WebSocketWrite,
 };
-use futures_util::{pin_mut, StreamExt};
-use hyper::header::{AUTHORIZATION, SEC_WEBSOCKET_VERSION, UPGRADE, X_FRAME_OPTIONS};
+use futures_util::{pin_mut};
+use hyper::header::{AUTHORIZATION, SEC_WEBSOCKET_VERSION, UPGRADE};
 use hyper::header::{CONNECTION, HOST, SEC_WEBSOCKET_KEY};
 use hyper::server::conn::Http;
 use hyper::service::service_fn;
@@ -23,21 +19,16 @@ use hyper::upgrade::Upgraded;
 use hyper::{http, Body, Request, Response, StatusCode};
 use jsonwebtoken::{Algorithm, DecodingKey, EncodingKey, Header, TokenData, Validation};
 use once_cell::sync::Lazy;
-use tokio::io::{
-    AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, Interest, ReadHalf, WriteHalf,
-};
-use tokio::net::{TcpListener, TcpStream, UdpSocket};
+use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, ReadHalf, WriteHalf};
+use tokio::net::{TcpListener, UdpSocket};
 use tokio::select;
 use tokio::sync::oneshot;
-use tokio::time::error::Elapsed;
 use tokio::time::timeout;
 
-use crate::udp::{MyUdpSocket, UdpStream};
+use crate::udp::MyUdpSocket;
 use serde::{Deserialize, Serialize};
-use tokio_rustls::TlsAcceptor;
 use tracing::log::debug;
-use tracing::{error, field, info, instrument, trace, warn, Instrument, Span};
-use url::quirks::host;
+use tracing::{error, info, instrument, trace, warn, Instrument, Span};
 use url::Host;
 use uuid::Uuid;
 
@@ -318,7 +309,7 @@ async fn server_upgrade(
     Ok(response)
 }
 
-#[instrument(name="tunnel", level="info", skip_all, fields(id=field::Empty, remote=field::Empty, peer=field::Empty, forwarded_for=field::Empty))]
+#[instrument(name="tunnel", level="info", skip_all, fields(id=tracing::field::Empty, remote=tracing::field::Empty, peer=tracing::field::Empty, forwarded_for=tracing::field::Empty))]
 pub async fn run_server(server_config: Arc<WsServerConfig>) -> anyhow::Result<()> {
     info!(
         "Starting wstunnel server listening on {}",
diff --git a/src/udp.rs b/src/udp.rs
index 73a5d35..c21e68e 100644
--- a/src/udp.rs
+++ b/src/udp.rs
@@ -1,21 +1,16 @@
-#![allow(unused_imports)]
-
 use anyhow::Context;
-use futures_util::future::join;
-use futures_util::{stream, FutureExt, Stream};
-use hyper::server;
-use libc::poll;
+use futures_util::{stream, Stream};
 use pin_project::{pin_project, pinned_drop};
 use std::collections::hash_map::Entry;
 use std::collections::HashMap;
 use std::future::Future;
 use std::io;
-use std::io::{Error, ErrorKind, IoSlice};
+use std::io::{Error, ErrorKind};
 use std::net::SocketAddr;
 use std::pin::{pin, Pin};
 use std::sync::{Arc, RwLock, Weak};
 use std::task::Poll;
-use std::time::{Duration, Instant};
+use std::time::Duration;
 use tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt, DuplexStream, ReadBuf};
 use tokio::net::UdpSocket;
 use tokio::time::Sleep;