diff --git a/client.json b/client.json
index b7b60b2..aa7e172 100644
--- a/client.json
+++ b/client.json
@@ -1,6 +1,6 @@
 {
   "listen": "127.0.0.1:2001",
   "cert_pem_file": "cert.pem",
-  "proxy_address": "47.52.7.223:1443",
+  "proxy_address": "127.0.0.1:2002",
   "proxy_server_name": "localhost"
 }
diff --git a/src/client.rs b/src/client.rs
index 177ae88..64228c8 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -2,7 +2,7 @@ use std::fs;
 use std::net::SocketAddr;
 
 use rust_util::{util_time, XResult};
-use s2n_quic::Client;
+use s2n_quic::{Client, Connection};
 use s2n_quic::client::Connect;
 use tokio::net::TcpListener;
 use tokio::sync::mpsc::channel;
@@ -42,6 +42,7 @@ pub async fn run(listen_config: &ListenConfig) -> XResult<()> {
     let server_name = opt_value_result!(&listen_config.proxy_server_name,
         "proxy_server_name in config is require in client mode");
 
+    let mut connection_opt: Option<Connection> = None;
     loop {
         let (client_stream_time, client_stream) = match inbound_stream_channel_receiver.recv().await {
             Some(time_and_stream) => time_and_stream,
@@ -51,34 +52,37 @@ pub async fn run(listen_config: &ListenConfig) -> XResult<()> {
             }
         };
         information!("Get connection: {} - {}", client_stream_time, client_stream.peer_addr().unwrap());
-        let addr = addr.clone();
-        let client = client.clone();
-        let server_name = server_name.clone();
-        tokio::spawn(async move {
+        let time = util_time::get_current_millis();
+        if (time as i128 - client_stream_time as i128).abs() > 3_000 {
+            warning!("Connection is more than 3 second, abandon connection");
+            continue;
+        }
+
+        if let None = connection_opt {
             let connect = Connect::new(addr).with_server_name(server_name.as_str());
             let mut connection = match client.connect(connect).await {
                 Ok(connection) => connection,
                 Err(e) => {
                     failure!("Connect to server failed: {}", e);
-                    return;
+                    continue;
                 }
             };
             connection.keep_alive(true).ok();
+            connection_opt = Some(connection);
+        }
 
-            let time = util_time::get_current_millis();
-            if (time as i128 - client_stream_time as i128).abs() > 3_000 {
-                warning!("Connection is more than 3 second, abandon connection");
-                return;
+        let connection = connection_opt.as_mut().unwrap();
+        let server_stream = match connection.open_bidirectional_stream().await {
+            Ok(stream) => stream,
+            Err(e) => {
+                failure!("Open stream in connection to server failed: {}", e);
+                connection_opt = None;
+                continue;
             }
-
-            let server_stream = match connection.open_bidirectional_stream().await {
-                Ok(stream) => stream,
-                Err(e) => {
-                    failure!("Open stream in connection to server failed: {}", e);
-                    return;
-                }
-            };
-            let conn_count = format!("{}", util_time::get_current_millis());
+        };
+        let connection_id = connection.id();
+        tokio::spawn(async move {
+            let conn_count = format!("{}-{}-{}", util_time::get_current_millis(), connection_id, server_stream.id());
             if let Err(e) = io_util::transfer_for_client_to_server(client_stream, server_stream, conn_count).await {
                 failure!("Client - Server error: {}", e);
             }
diff --git a/src/io_util.rs b/src/io_util.rs
index e706d78..ed9db4d 100644
--- a/src/io_util.rs
+++ b/src/io_util.rs
@@ -2,11 +2,14 @@ use std::io::{Error, ErrorKind};
 use std::time::Duration;
 
 use futures::future::try_join;
+use rust_util::util_msg;
+use rust_util::util_msg::MessageType;
 use s2n_quic::stream::BidirectionalStream;
 use tokio::{select, time};
 use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt};
 use tokio::net::TcpStream;
 
+#[derive(Debug)]
 enum StreamDirection {
     Up,
     Down,
@@ -143,7 +146,7 @@ async fn inner_transfer<'a, R1, W1, R2, W2>(mut ri: &'a mut R1, mut wi: &'a mut
 // }
 
 async fn copy_data<'a, R, W>(
-    reader: &'a mut R, writer: &'a mut W, _direction: StreamDirection, _conn_count: &str) -> tokio::io::Result<u64>
+    reader: &'a mut R, writer: &'a mut W, direction: StreamDirection, conn_count: &str) -> tokio::io::Result<u64>
     where R: AsyncRead + Unpin + ?Sized,
           W: AsyncWrite + Unpin + ?Sized {
     let mut total_copied_bytes = 0_u64;
@@ -151,11 +154,17 @@ async fn copy_data<'a, R, W>(
     loop {
         match reader.read(&mut buff).await {
             Ok(0) => return Ok(total_copied_bytes),
-            Ok(n) => match writer.write_all(&buff[..n]).await {
-                Ok(_) => {
-                    total_copied_bytes += n as u64;
+            Ok(n) => {
+                util_msg::when(MessageType::DEBUG, || {
+                    debugging!("[conn {}] Direction: {:?}, {} bytes: {:02x?}", conn_count, direction, n, &buff[..n]);
+                    debugging!("[conn {}] Direction: {:?}, {} string: {}", conn_count, direction, n, String::from_utf8_lossy(&buff[..n]).to_string());
+                });
+                match writer.write_all(&buff[..n]).await {
+                    Ok(_) => {
+                        total_copied_bytes += n as u64;
+                    }
+                    Err(e) => return Err(e),
                 }
-                Err(e) => return Err(e),
             }
             Err(e) => return Err(e),
         }
diff --git a/src/server.rs b/src/server.rs
index 85d4379..2a774e7 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -26,10 +26,11 @@ pub async fn run(listen_config: &ListenConfig) -> XResult<()> {
             information!("Connection accepted from {:?}", connection.remote_addr());
             while let Ok(Some(stream)) = connection.accept_bidirectional_stream().await {
                 // spawn a new task for the stream
+                let connection_id = connection.id();
                 let proxy_address = proxy_address.clone();
                 tokio::spawn(async move {
                     information!("Stream opened from {:?}", stream.connection().remote_addr());
-                    let conn_count = format!("{}", rust_util::util_time::get_current_millis());
+                    let conn_count = format!("{}-{}-{}", rust_util::util_time::get_current_millis(), connection_id, stream.id());
                     if let Err(e) = io_util::transfer_for_server_to_remote(stream, proxy_address, conn_count).await {
                         failure!("Server - Client error: {}", e);
                     }