diff --git a/Cargo.lock b/Cargo.lock
index 2308a19..6272f0f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -115,6 +115,8 @@ dependencies = [
 [[package]]
 name = "kaminari"
 version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e61016796e12b5c49fae513e18b92b6cd722f6ad5b0f2c65efbf6fb7b98897a7"
 dependencies = [
  "lazy_static",
  "lightws",
@@ -127,9 +129,7 @@ dependencies = [
 
 [[package]]
 name = "kaminari"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e61016796e12b5c49fae513e18b92b6cd722f6ad5b0f2c65efbf6fb7b98897a7"
+version = "0.7.1"
 dependencies = [
  "lazy_static",
  "lightws",
@@ -145,7 +145,7 @@ name = "kaminari-cmd"
 version = "0.5.0"
 dependencies = [
  "anyhow",
- "kaminari 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "kaminari 0.7.0",
  "realm_io",
  "tokio",
 ]
diff --git a/kaminari/Cargo.toml b/kaminari/Cargo.toml
index 7289131..d0c4c5f 100644
--- a/kaminari/Cargo.toml
+++ b/kaminari/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "kaminari"
-version = "0.7.0"
+version = "0.7.1"
 edition = "2021"
 authors = ["zephyr <i@zephyr.moe>"]
 keywords = ["lightws", "network"]
diff --git a/kaminari/src/mix.rs b/kaminari/src/mix.rs
index fa399fe..2c8dbbe 100644
--- a/kaminari/src/mix.rs
+++ b/kaminari/src/mix.rs
@@ -1,5 +1,6 @@
 use std::io::Result;
 use std::future::Future;
+use std::fmt::{Display, Formatter};
 
 use super::{IOStream, AsyncAccept, AsyncConnect};
 use super::nop::{NopAccept, NopConnect};
@@ -253,3 +254,73 @@ impl_type_cast!(
         [as_tls :: Tls => TlsAccept<NopAccept>],
         [as_wss :: Wss => WsAccept<TlsAccept<NopAccept>>],
 );
+
+// ========== display ==========
+
+macro_rules! impl_display {
+    ($mix: ident || $($member: ident,)+ ) => {
+        impl Display for $mix {
+            fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+                use $mix::*;
+                match self {
+                    $(
+                        $member(x) => write!(f, "{}", x),
+                    )+
+                }
+            }
+        }
+    };
+}
+
+impl_display!(MixConnect || Plain, Ws, Tls, Wss,);
+impl_display!(MixAccept || Plain, Ws, Tls, Wss,);
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn print_conn() {
+        let conf = MixClientConf {
+            ws: Some(WsConf {
+                host: String::from("abc"),
+                path: String::from("chat"),
+            }),
+            tls: Some(TlsClientConf {
+                sni: String::from("abc"),
+                insecure: true,
+                early_data: true,
+            }),
+        };
+
+        println!("ws: {}", conf.clone().ws.unwrap());
+        println!("tls: {}", conf.clone().tls.unwrap());
+
+        let conn = MixConnect::new(conf);
+
+        println!("{}", conn);
+    }
+
+    #[test]
+    fn print_lis() {
+        let conf = MixServerConf {
+            ws: Some(WsConf {
+                host: String::from("abc"),
+                path: String::from("chat"),
+            }),
+            tls: Some(TlsServerConf {
+                crt: String::new(),
+                key: String::new(),
+                ocsp: String::new(),
+                server_name: String::from("abc"),
+            }),
+        };
+
+        println!("ws: {}", conf.clone().ws.unwrap());
+        println!("tls: {}", conf.clone().tls.unwrap());
+
+        let lis = MixAccept::new(conf);
+
+        println!("{}", lis);
+    }
+}
diff --git a/kaminari/src/nop.rs b/kaminari/src/nop.rs
index c63650d..6a3fd45 100644
--- a/kaminari/src/nop.rs
+++ b/kaminari/src/nop.rs
@@ -1,14 +1,23 @@
 use std::io::Result;
 use std::future::Future;
+use std::fmt::{Display, Formatter};
 
 use super::{IOStream, AsyncAccept, AsyncConnect};
 
-#[derive(Clone, Copy)]
+#[derive(Debug, Clone, Copy)]
 pub struct NopConnect {}
 
-#[derive(Clone, Copy)]
+#[derive(Debug, Clone, Copy)]
 pub struct NopAccept {}
 
+impl Display for NopConnect {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { write!(f, "[plain]") }
+}
+
+impl Display for NopAccept {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { write!(f, "[plain]") }
+}
+
 impl<S> AsyncConnect<S> for NopConnect
 where
     S: IOStream,
diff --git a/kaminari/src/tls.rs b/kaminari/src/tls.rs
index d684a56..912c7a8 100644
--- a/kaminari/src/tls.rs
+++ b/kaminari/src/tls.rs
@@ -1,6 +1,7 @@
 use std::io::Result;
 use std::future::Future;
 use std::sync::Arc;
+use std::fmt::{Display, Formatter};
 
 use super::{IOStream, AsyncAccept, AsyncConnect};
 
@@ -21,6 +22,16 @@ pub struct TlsClientConf {
     pub early_data: bool,
 }
 
+impl Display for TlsClientConf {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "sni: {}, insecure: {}, early_data: {}",
+            self.sni, self.insecure, self.early_data
+        )
+    }
+}
+
 #[derive(Clone)]
 pub struct TlsConnect<T> {
     conn: T,
@@ -28,6 +39,13 @@ pub struct TlsConnect<T> {
     cc: TlsConnector,
 }
 
+impl<T> Display for TlsConnect<T>
+where
+    T: Display,
+{
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { write!(f, "[tls]{}", self.conn) }
+}
+
 impl<T> TlsConnect<T> {
     pub fn new(conn: T, conf: TlsClientConf) -> Self {
         let TlsClientConf {
@@ -110,12 +128,29 @@ pub struct TlsServerConf {
     pub server_name: String,
 }
 
+impl Display for TlsServerConf {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "cert: {}, key: {}, oscp: {}, server_name: {}",
+            self.crt, self.key, self.ocsp, self.server_name
+        )
+    }
+}
+
 #[derive(Clone)]
 pub struct TlsAccept<T> {
     lis: T,
     ac: TlsAcceptor,
 }
 
+impl<T> Display for TlsAccept<T>
+where
+    T: Display,
+{
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { write!(f, "[tls]{}", self.lis) }
+}
+
 impl<T> TlsAccept<T> {
     pub fn new(lis: T, conf: TlsServerConf) -> Self {
         let TlsServerConf {
diff --git a/kaminari/src/ws.rs b/kaminari/src/ws.rs
index 697e10b..0970bcd 100644
--- a/kaminari/src/ws.rs
+++ b/kaminari/src/ws.rs
@@ -1,6 +1,7 @@
 use std::io::Result;
 use std::future::Future;
 use std::marker::PhantomData;
+use std::fmt::{Display, Formatter};
 
 use super::{IOStream, AsyncAccept, AsyncConnect};
 
@@ -20,6 +21,12 @@ pub struct WsConf {
     pub path: String,
 }
 
+impl Display for WsConf {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "host: {}, path: {}", self.host, self.path)
+    }
+}
+
 // =========== client ==========
 #[derive(Clone, Copy)]
 pub struct Simple {}
@@ -46,13 +53,20 @@ impl Mode for Fixed {
     type ClientType = FixedMaskClient;
 }
 
-#[derive(Clone)]
+#[derive(Debug, Clone)]
 pub struct WsConnect<T, M = Simple> {
     conn: T,
     conf: WsConf,
     _marker: PhantomData<M>,
 }
 
+impl<T, M> Display for WsConnect<T, M>
+where
+    T: Display,
+{
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { write!(f, "[ws]{}", self.conn) }
+}
+
 impl<T> WsConnect<T> {
     #[inline]
     pub const fn new(conn: T, conf: WsConf) -> Self {
@@ -115,6 +129,13 @@ pub struct WsAccept<T> {
     conf: WsConf,
 }
 
+impl<T> Display for WsAccept<T>
+where
+    T: Display,
+{
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { write!(f, "[ws]{}", self.lis) }
+}
+
 impl<T> WsAccept<T> {
     #[inline]
     pub const fn new(lis: T, conf: WsConf) -> Self { Self { lis, conf } }