diff --git a/src/config.rs b/src/config.rs
index 139da942..90e3958a 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -679,10 +679,7 @@ impl ConfigType {
 
     /// Check if it is manager server type
     pub fn is_manager(self) -> bool {
-        match self {
-            ConfigType::Manager => true,
-            _ => false,
-        }
+        matches!(self, ConfigType::Manager)
     }
 }
 
@@ -696,17 +693,11 @@ pub enum Mode {
 
 impl Mode {
     pub fn enable_udp(self) -> bool {
-        match self {
-            Mode::UdpOnly | Mode::TcpAndUdp => true,
-            _ => false,
-        }
+        matches!(self, Mode::UdpOnly | Mode::TcpAndUdp)
     }
 
     pub fn enable_tcp(self) -> bool {
-        match self {
-            Mode::TcpOnly | Mode::TcpAndUdp => true,
-            _ => false,
-        }
+        matches!(self, Mode::TcpOnly | Mode::TcpAndUdp)
     }
 }
 
diff --git a/src/crypto/ring.rs b/src/crypto/ring.rs
index 8662a4a4..3b38d154 100644
--- a/src/crypto/ring.rs
+++ b/src/crypto/ring.rs
@@ -119,10 +119,8 @@ impl<'a> AsMut<[u8]> for SealBuffer<'a> {
 
 impl<'a, 'in_out> Extend<&'in_out u8> for SealBuffer<'a> {
     fn extend<T: IntoIterator<Item = &'in_out u8>>(&mut self, iter: T) {
-        let mut idx = 0;
-        for b in iter {
+        for (idx, b) in iter.into_iter().enumerate() {
             self.buffer[self.input_len + idx] = *b;
-            idx += 1;
         }
     }
 }
diff --git a/src/relay/tcprelay/http_local.rs b/src/relay/tcprelay/http_local.rs
index 58e02c0a..b3feb488 100644
--- a/src/relay/tcprelay/http_local.rs
+++ b/src/relay/tcprelay/http_local.rs
@@ -391,11 +391,8 @@ fn host_addr(uri: &Uri) -> Option<Address> {
 }
 
 fn check_keep_alive(version: Version, headers: &HeaderMap<HeaderValue>, check_proxy: bool) -> bool {
-    let mut conn_keep_alive = match version {
-        Version::HTTP_09 | Version::HTTP_10 => false,
-        // HTTP/1.1, HTTP/2, HTTP/3 keeps alive by default
-        _ => true,
-    };
+    // HTTP/1.1, HTTP/2, HTTP/3 keeps alive by default
+    let mut conn_keep_alive = !matches!(version, Version::HTTP_09 | Version::HTTP_10);
 
     if check_proxy {
         // Modern browers will send Proxy-Connection instead of Connection
diff --git a/src/relay/tcprelay/proxy_stream.rs b/src/relay/tcprelay/proxy_stream.rs
index 56777c3a..55d845cd 100644
--- a/src/relay/tcprelay/proxy_stream.rs
+++ b/src/relay/tcprelay/proxy_stream.rs
@@ -180,10 +180,7 @@ enum ProxyConnection {
 impl ProxyConnection {
     /// Check if the underlying connection is proxied
     fn is_proxied(&self) -> bool {
-        match *self {
-            ProxyConnection::Proxied { .. } => true,
-            _ => false,
-        }
+        matches!(*self, ProxyConnection::Proxied { .. })
     }
 
     fn local_addr(&self) -> io::Result<SocketAddr> {