diff --git a/net/proxy/datagram.h b/net/proxy/datagram.h
index 1d9ed35..b91984a 100644
--- a/net/proxy/datagram.h
+++ b/net/proxy/datagram.h
@@ -17,7 +17,6 @@ class Datagram {
     using executor_type = any_io_executor;
 
     virtual ~Datagram() = default;
-    virtual any_io_executor get_executor() = 0;
 
     virtual void async_receive_from(
         absl::Span<mutable_buffer const> buffers,
@@ -29,6 +28,9 @@ class Datagram {
         const udp::endpoint &endpoint,
         absl::AnyInvocable<void(std::error_code, size_t) &&> callback) = 0;
 
+    virtual any_io_executor get_executor() = 0;
+    virtual void close() = 0;
+
     template <typename BuffersT>
     void async_receive_from(
         const BuffersT &buffers,
diff --git a/net/proxy/misc/random-handler.cc b/net/proxy/misc/random-handler.cc
index 87eb29d..b355994 100644
--- a/net/proxy/misc/random-handler.cc
+++ b/net/proxy/misc/random-handler.cc
@@ -25,7 +25,7 @@ class StreamConnection : public boost::intrusive_ref_counter<
 private:
     void read();
     void write();
-    void close() { stream_.reset(); }
+    void close() { stream_->close(); }
 
     std::unique_ptr<Stream> stream_;
     absl::FixedArray<uint8_t, 0> read_buffer_;
@@ -58,9 +58,6 @@ StreamConnection::StreamConnection(std::unique_ptr<Stream> stream)
 }
 
 void StreamConnection::read() {
-    if (!stream_) {
-        return;
-    }
     stream_->async_read_some(
         buffer(read_buffer_.data(), read_buffer_.size()),
         [connection = boost::intrusive_ptr<StreamConnection>(this)](
@@ -74,9 +71,6 @@ void StreamConnection::read() {
 }
 
 void StreamConnection::write() {
-    if (!stream_) {
-        return;
-    }
     stream_->async_write_some(
         const_buffer(write_buffer_.data(), write_buffer_.size()),
         [connection = boost::intrusive_ptr<StreamConnection>(this)](
diff --git a/net/proxy/misc/zero-handler.cc b/net/proxy/misc/zero-handler.cc
index 10b30a7..2f30f40 100644
--- a/net/proxy/misc/zero-handler.cc
+++ b/net/proxy/misc/zero-handler.cc
@@ -24,7 +24,7 @@ class StreamConnection : public boost::intrusive_ref_counter<
 private:
     void read();
     void write();
-    void close() { stream_.reset(); }
+    void close() { stream_->close(); }
 
     std::unique_ptr<Stream> stream_;
     absl::FixedArray<uint8_t, 0> read_buffer_;
@@ -55,9 +55,6 @@ StreamConnection::StreamConnection(std::unique_ptr<Stream> stream)
       write_buffer_(8192) {}
 
 void StreamConnection::read() {
-    if (!stream_) {
-        return;
-    }
     stream_->async_read_some(
         buffer(read_buffer_.data(), read_buffer_.size()),
         [connection = boost::intrusive_ptr<StreamConnection>(this)](
@@ -71,9 +68,6 @@ void StreamConnection::read() {
 }
 
 void StreamConnection::write() {
-    if (!stream_) {
-        return;
-    }
     stream_->async_write_some(
         const_buffer(write_buffer_.data(), write_buffer_.size()),
         [connection = boost::intrusive_ptr<StreamConnection>(this)](
diff --git a/net/proxy/shadowsocks/connector.cc b/net/proxy/shadowsocks/connector.cc
index 6b57069..411f78c 100644
--- a/net/proxy/shadowsocks/connector.cc
+++ b/net/proxy/shadowsocks/connector.cc
@@ -43,7 +43,8 @@ class Connector::TcpStream : public proxy::Stream {
         absl::Span<const_buffer const> buffers,
         absl::AnyInvocable<void(std::error_code, size_t) &&> callback) override;
 
-    any_io_executor get_executor() override;
+    any_io_executor get_executor() override { return connector_.executor_; }
+    void close() override { base_stream_->close(); }
 
 private:
     void connect(absl::AnyInvocable<void(std::error_code) &&> callback);
@@ -455,10 +456,6 @@ void Connector::TcpStream::async_write_some(
         });
 }
 
-any_io_executor Connector::TcpStream::get_executor() {
-    return connector_.executor_;
-}
-
 }  // namespace shadowsocks
 }  // namespace proxy
 }  // namespace net
diff --git a/net/proxy/shadowsocks/handler.cc b/net/proxy/shadowsocks/handler.cc
index fa932a4..7574a7d 100644
--- a/net/proxy/shadowsocks/handler.cc
+++ b/net/proxy/shadowsocks/handler.cc
@@ -85,9 +85,6 @@ Handler::TcpConnection::TcpConnection(
       write_header_(handler_.pre_shared_key_.method().is_spec_2022()) {}
 
 void Handler::TcpConnection::forward_read() {
-    if (!stream_) {
-        return;
-    }
     BufferSpan read_buffer = decryptor_.buffer();
     stream_->async_read_some(
         buffer(read_buffer.data(), read_buffer.size()),
@@ -342,9 +339,6 @@ void Handler::TcpConnection::forward_parse_host(size_t header_length) {
 }
 
 void Handler::TcpConnection::forward_write() {
-    if (!remote_stream_) {
-        return;
-    }
     async_write(
         *remote_stream_,
         buffer(decryptor_.pop_buffer(read_length_), read_length_),
@@ -361,9 +355,6 @@ void Handler::TcpConnection::forward_write() {
 }
 
 void Handler::TcpConnection::backward_read() {
-    if (!remote_stream_) {
-        return;
-    }
     remote_stream_->async_read_some(
         buffer(backward_read_buffer_.data(), backward_read_buffer_.size()),
         [connection = boost::intrusive_ptr<TcpConnection>(this)](
@@ -378,9 +369,6 @@ void Handler::TcpConnection::backward_read() {
 }
 
 void Handler::TcpConnection::backward_write() {
-    if (!stream_) {
-        return;
-    }
     ConstBufferSpan read_buffer(
         backward_read_buffer_.data(), backward_read_size_);
     do {
@@ -420,8 +408,10 @@ void Handler::TcpConnection::backward_write() {
 }
 
 void Handler::TcpConnection::close() {
-    remote_stream_.reset();
-    stream_.reset();
+    if (remote_stream_) {
+        remote_stream_->close();
+    }
+    stream_->close();
 }
 
 }  // namespace shadowsocks
diff --git a/net/proxy/socks/handler.cc b/net/proxy/socks/handler.cc
index 8e472f2..fca0948 100644
--- a/net/proxy/socks/handler.cc
+++ b/net/proxy/socks/handler.cc
@@ -76,9 +76,6 @@ Handler::TcpConnection::TcpConnection(
       backward_buffer_(4096) {}
 
 void Handler::TcpConnection::forward_read() {
-    if (!stream_) {
-        return;
-    }
     stream_->async_read_some(
         buffer(
             &forward_buffer_[forward_size_],
@@ -246,9 +243,6 @@ void Handler::TcpConnection::connect_host(ConstBufferSpan buffer) {
 }
 
 void Handler::TcpConnection::forward_write() {
-    if (!remote_stream_) {
-        return;
-    }
     async_write(
         *remote_stream_,
         buffer(forward_buffer_.data(), forward_size_),
@@ -279,9 +273,6 @@ void Handler::TcpConnection::reply() {
 }
 
 void Handler::TcpConnection::backward_write() {
-    if (!stream_) {
-        return;
-    }
     async_write(
         *stream_,
         buffer(backward_buffer_.data(), backward_size_),
@@ -309,9 +300,6 @@ void Handler::TcpConnection::backward_dispatch() {
 }
 
 void Handler::TcpConnection::backward_read() {
-    if (!remote_stream_) {
-        return;
-    }
     remote_stream_->async_read_some(
         buffer(
             &backward_buffer_[backward_size_],
@@ -328,8 +316,10 @@ void Handler::TcpConnection::backward_read() {
 }
 
 void Handler::TcpConnection::close() {
-    remote_stream_.reset();
-    stream_.reset();
+    if (remote_stream_) {
+        remote_stream_->close();
+    }
+    stream_->close();
 }
 
 }  // namespace socks
diff --git a/net/proxy/stream.h b/net/proxy/stream.h
index 022e8de..e7ec186 100644
--- a/net/proxy/stream.h
+++ b/net/proxy/stream.h
@@ -17,7 +17,6 @@ class Stream {
     using executor_type = any_io_executor;
 
     virtual ~Stream() = default;
-    virtual any_io_executor get_executor() = 0;
 
     virtual void async_read_some(
         absl::Span<mutable_buffer const> buffers,
@@ -27,6 +26,9 @@ class Stream {
         absl::Span<const_buffer const> buffers,
         absl::AnyInvocable<void(std::error_code, size_t) &&> callback) = 0;
 
+    virtual any_io_executor get_executor() = 0;
+    virtual void close() = 0;
+
     template <typename BuffersT>
     void async_read_some(
         const BuffersT &buffers,
diff --git a/net/proxy/system/tcp-socket-stream.cc b/net/proxy/system/tcp-socket-stream.cc
index 59d683e..007e7e9 100644
--- a/net/proxy/system/tcp-socket-stream.cc
+++ b/net/proxy/system/tcp-socket-stream.cc
@@ -8,7 +8,7 @@ namespace system {
 
 TcpSocketStream::TcpSocketStream(tcp::socket socket, TimerList &timer_list)
     : socket_(std::move(socket)),
-      timer_(timer_list, [this]() { socket_.close(); }) {}
+      timer_(timer_list, [this]() { close(); }) {}
 
 void TcpSocketStream::async_read_some(
     absl::Span<mutable_buffer const> buffers,
@@ -28,6 +28,11 @@ void TcpSocketStream::async_write_some(
     timer_.update();
 }
 
+void TcpSocketStream::close() {
+    boost::system::error_code ec;
+    socket_.close(ec);
+}
+
 }  // namespace proxy
 }  // namespace system
 }  // namespace net
diff --git a/net/proxy/system/tcp-socket-stream.h b/net/proxy/system/tcp-socket-stream.h
index c49fb5e..d839ab9 100644
--- a/net/proxy/system/tcp-socket-stream.h
+++ b/net/proxy/system/tcp-socket-stream.h
@@ -16,10 +16,6 @@ class TcpSocketStream : public Stream {
     TcpSocketStream(const TcpSocketStream &) = delete;
     TcpSocketStream &operator=(const TcpSocketStream &) = delete;
 
-    any_io_executor get_executor() override {
-        return socket_.get_executor();
-    }
-
     void async_read_some(
         absl::Span<mutable_buffer const> buffers,
         absl::AnyInvocable<void(std::error_code, size_t) &&> callback) override;
@@ -28,6 +24,9 @@ class TcpSocketStream : public Stream {
         absl::Span<const_buffer const> buffers,
         absl::AnyInvocable<void(std::error_code, size_t) &&> callback) override;
 
+    any_io_executor get_executor() override { return socket_.get_executor(); }
+    void close() override;
+
     using Stream::async_read_some;
     using Stream::async_write_some;
 
diff --git a/net/proxy/system/udp-socket-datagram.cc b/net/proxy/system/udp-socket-datagram.cc
index 3859ccf..c26c467 100644
--- a/net/proxy/system/udp-socket-datagram.cc
+++ b/net/proxy/system/udp-socket-datagram.cc
@@ -29,6 +29,11 @@ void UdpSocketDatagram::async_send_to(
         std::move(callback));
 }
 
+void UdpSocketDatagram::close() {
+    boost::system::error_code ec;
+    socket_.close(ec);
+}
+
 }  // namespace proxy
 }  // namespace system
 }  // namespace net
diff --git a/net/proxy/system/udp-socket-datagram.h b/net/proxy/system/udp-socket-datagram.h
index 6a81b5a..ed74bff 100644
--- a/net/proxy/system/udp-socket-datagram.h
+++ b/net/proxy/system/udp-socket-datagram.h
@@ -15,10 +15,6 @@ class UdpSocketDatagram : public Datagram {
     UdpSocketDatagram(const UdpSocketDatagram &) = delete;
     UdpSocketDatagram &operator=(const UdpSocketDatagram &) = delete;
 
-    any_io_executor get_executor() override {
-        return socket_.get_executor();
-    }
-
     void async_receive_from(
         absl::Span<mutable_buffer const> buffers,
         udp::endpoint &endpoint,
@@ -29,6 +25,9 @@ class UdpSocketDatagram : public Datagram {
         const udp::endpoint &endpoint,
         absl::AnyInvocable<void(std::error_code, size_t) &&> callback) override;
 
+    any_io_executor get_executor() override { return socket_.get_executor(); }
+    void close() override;
+
     using Datagram::async_receive_from;
     using Datagram::async_send_to;