diff --git a/app/dispatcher/default.go b/app/dispatcher/default.go
index b66eef49e..ca2e6f0ae 100644
--- a/app/dispatcher/default.go
+++ b/app/dispatcher/default.go
@@ -12,6 +12,7 @@ import (
 	"v2ray.com/core/common/buf"
 	"v2ray.com/core/common/net"
 	"v2ray.com/core/common/protocol"
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/common/stats"
 	"v2ray.com/core/proxy"
 	"v2ray.com/core/transport/pipe"
@@ -143,7 +144,7 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
 			outbound.Reader = cReader
 			domain, err := sniffer(ctx, snifferList, cReader)
 			if err == nil {
-				newError("sniffed domain: ", domain).WithContext(ctx).WriteToLog()
+				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
 				destination.Address = net.ParseAddress(domain)
 				ctx = proxy.ContextWithTarget(ctx, destination)
 			}
@@ -189,13 +190,13 @@ func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *core.Link,
 	if d.router != nil {
 		if tag, err := d.router.PickRoute(ctx); err == nil {
 			if handler := d.ohm.GetHandler(tag); handler != nil {
-				newError("taking detour [", tag, "] for [", destination, "]").WithContext(ctx).WriteToLog()
+				newError("taking detour [", tag, "] for [", destination, "]").WriteToLog(session.ExportIDToError(ctx))
 				dispatcher = handler
 			} else {
-				newError("non existing tag: ", tag).AtWarning().WithContext(ctx).WriteToLog()
+				newError("non existing tag: ", tag).AtWarning().WriteToLog(session.ExportIDToError(ctx))
 			}
 		} else {
-			newError("default route for ", destination).WithContext(ctx).WriteToLog()
+			newError("default route for ", destination).WriteToLog(session.ExportIDToError(ctx))
 		}
 	}
 	dispatcher.Dispatch(ctx, link)
diff --git a/app/proxyman/inbound/inbound.go b/app/proxyman/inbound/inbound.go
index f251d2e9c..888564ece 100644
--- a/app/proxyman/inbound/inbound.go
+++ b/app/proxyman/inbound/inbound.go
@@ -10,6 +10,7 @@ import (
 	"v2ray.com/core/app/proxyman"
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/serial"
+	"v2ray.com/core/common/session"
 )
 
 // Manager is to manage all inbound handlers.
@@ -74,7 +75,7 @@ func (m *Manager) RemoveHandler(ctx context.Context, tag string) error {
 
 	if handler, found := m.taggedHandlers[tag]; found {
 		if err := handler.Close(); err != nil {
-			newError("failed to close handler ", tag).Base(err).AtWarning().WithContext(ctx).WriteToLog()
+			newError("failed to close handler ", tag).Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
 		}
 		delete(m.taggedHandlers, tag)
 		return nil
diff --git a/app/proxyman/inbound/worker.go b/app/proxyman/inbound/worker.go
index 2895f6269..2a97d7736 100644
--- a/app/proxyman/inbound/worker.go
+++ b/app/proxyman/inbound/worker.go
@@ -52,7 +52,7 @@ func (w *tcpWorker) callback(conn internet.Connection) {
 	if w.recvOrigDest {
 		dest, err := tcp.GetOriginalDestination(conn)
 		if err != nil {
-			newError("failed to get original destination").WithContext(ctx).Base(err).WriteToLog()
+			newError("failed to get original destination").Base(err).WriteToLog(session.ExportIDToError(ctx))
 		}
 		if dest.IsValid() {
 			ctx = proxy.ContextWithOriginalTarget(ctx, dest)
@@ -74,11 +74,11 @@ func (w *tcpWorker) callback(conn internet.Connection) {
 		}
 	}
 	if err := w.proxy.Process(ctx, net.Network_TCP, conn, w.dispatcher); err != nil {
-		newError("connection ends").Base(err).WithContext(ctx).WriteToLog()
+		newError("connection ends").Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
 	cancel()
 	if err := conn.Close(); err != nil {
-		newError("failed to close connection").Base(err).WithContext(ctx).WriteToLog()
+		newError("failed to close connection").Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
 }
 
diff --git a/app/proxyman/mux/mux.go b/app/proxyman/mux/mux.go
index b1e989465..02c4b5c4d 100644
--- a/app/proxyman/mux/mux.go
+++ b/app/proxyman/mux/mux.go
@@ -16,6 +16,7 @@ import (
 	"v2ray.com/core/common/log"
 	"v2ray.com/core/common/net"
 	"v2ray.com/core/common/protocol"
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/common/signal/done"
 	"v2ray.com/core/proxy"
 	"v2ray.com/core/transport/pipe"
@@ -170,10 +171,10 @@ func fetchInput(ctx context.Context, s *Session, output buf.Writer) {
 	defer s.Close()      // nolint: errcheck
 	defer writer.Close() // nolint: errcheck
 
-	newError("dispatching request to ", dest).WithContext(ctx).WriteToLog()
+	newError("dispatching request to ", dest).WriteToLog(session.ExportIDToError(ctx))
 	if pReader, ok := s.input.(*pipe.Reader); ok {
 		if err := copyFirstPayload(pReader, writer); err != nil {
-			newError("failed to fetch first payload").Base(err).WithContext(ctx).WriteToLog()
+			newError("failed to fetch first payload").Base(err).WriteToLog(session.ExportIDToError(ctx))
 			writer.hasError = true
 			pipe.CloseError(s.input)
 			return
@@ -181,7 +182,7 @@ func fetchInput(ctx context.Context, s *Session, output buf.Writer) {
 	}
 
 	if err := buf.Copy(s.input, writer); err != nil {
-		newError("failed to fetch all input").Base(err).WithContext(ctx).WriteToLog()
+		newError("failed to fetch all input").Base(err).WriteToLog(session.ExportIDToError(ctx))
 		writer.hasError = true
 		pipe.CloseError(s.input)
 		return
@@ -346,7 +347,7 @@ type ServerWorker struct {
 func handle(ctx context.Context, s *Session, output buf.Writer) {
 	writer := NewResponseWriter(s.ID, output, s.transferType)
 	if err := buf.Copy(s.input, writer); err != nil {
-		newError("session ", s.ID, " ends.").Base(err).WithContext(ctx).WriteToLog()
+		newError("session ", s.ID, " ends.").Base(err).WriteToLog(session.ExportIDToError(ctx))
 		writer.hasError = true
 	}
 
@@ -362,7 +363,7 @@ func (w *ServerWorker) handleStatusKeepAlive(meta *FrameMetadata, reader *buf.Bu
 }
 
 func (w *ServerWorker) handleStatusNew(ctx context.Context, meta *FrameMetadata, reader *buf.BufferedReader) error {
-	newError("received request for ", meta.Target).WithContext(ctx).WriteToLog()
+	newError("received request for ", meta.Target).WriteToLog(session.ExportIDToError(ctx))
 	{
 		msg := &log.AccessMessage{
 			To:     meta.Target,
@@ -475,7 +476,7 @@ func (w *ServerWorker) run(ctx context.Context) {
 			err := w.handleFrame(ctx, reader)
 			if err != nil {
 				if errors.Cause(err) != io.EOF {
-					newError("unexpected EOF").Base(err).WithContext(ctx).WriteToLog()
+					newError("unexpected EOF").Base(err).WriteToLog(session.ExportIDToError(ctx))
 					pipe.CloseError(input)
 				}
 				return
diff --git a/app/proxyman/outbound/handler.go b/app/proxyman/outbound/handler.go
index 1a338559e..bb3ccfe5c 100644
--- a/app/proxyman/outbound/handler.go
+++ b/app/proxyman/outbound/handler.go
@@ -8,6 +8,7 @@ import (
 	"v2ray.com/core/app/proxyman/mux"
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/net"
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/proxy"
 	"v2ray.com/core/transport/internet"
 	"v2ray.com/core/transport/pipe"
@@ -77,13 +78,13 @@ func (h *Handler) Tag() string {
 func (h *Handler) Dispatch(ctx context.Context, link *core.Link) {
 	if h.mux != nil {
 		if err := h.mux.Dispatch(ctx, link); err != nil {
-			newError("failed to process mux outbound traffic").Base(err).WithContext(ctx).WriteToLog()
+			newError("failed to process mux outbound traffic").Base(err).WriteToLog(session.ExportIDToError(ctx))
 			pipe.CloseError(link.Writer)
 		}
 	} else {
 		if err := h.proxy.Process(ctx, link, h); err != nil {
 			// Ensure outbound ray is properly closed.
-			newError("failed to process outbound traffic").Base(err).WithContext(ctx).WriteToLog()
+			newError("failed to process outbound traffic").Base(err).WriteToLog(session.ExportIDToError(ctx))
 			pipe.CloseError(link.Writer)
 		} else {
 			common.Must(common.Close(link.Writer))
@@ -99,7 +100,7 @@ func (h *Handler) Dial(ctx context.Context, dest net.Destination) (internet.Conn
 			tag := h.senderSettings.ProxySettings.Tag
 			handler := h.outboundManager.GetHandler(tag)
 			if handler != nil {
-				newError("proxying to ", tag, " for dest ", dest).AtDebug().WithContext(ctx).WriteToLog()
+				newError("proxying to ", tag, " for dest ", dest).AtDebug().WriteToLog(session.ExportIDToError(ctx))
 				ctx = proxy.ContextWithTarget(ctx, dest)
 
 				opts := pipe.OptionsFromContext(ctx)
@@ -110,7 +111,7 @@ func (h *Handler) Dial(ctx context.Context, dest net.Destination) (internet.Conn
 				return net.NewConnection(net.ConnectionInputMulti(uplinkWriter), net.ConnectionOutputMulti(downlinkReader)), nil
 			}
 
-			newError("failed to get outbound handler with tag: ", tag).AtWarning().WithContext(ctx).WriteToLog()
+			newError("failed to get outbound handler with tag: ", tag).AtWarning().WriteToLog(session.ExportIDToError(ctx))
 		}
 
 		if h.senderSettings.Via != nil {
diff --git a/common/errors/errors.go b/common/errors/errors.go
index b9b354157..8a487c288 100644
--- a/common/errors/errors.go
+++ b/common/errors/errors.go
@@ -2,13 +2,11 @@
 package errors // import "v2ray.com/core/common/errors"
 
 import (
-	"context"
 	"os"
 	"strings"
 
 	"v2ray.com/core/common/log"
 	"v2ray.com/core/common/serial"
-	"v2ray.com/core/common/session"
 )
 
 type hasInnerError interface {
@@ -20,17 +18,13 @@ type hasSeverity interface {
 	Severity() log.Severity
 }
 
-type hasContext interface {
-	Context() context.Context
-}
-
 // Error is an error object with underlying error.
 type Error struct {
+	prefix   []interface{}
+	path     []string
 	message  []interface{}
 	inner    error
 	severity log.Severity
-	path     []string
-	ctx      context.Context
 }
 
 // Error implements error.Error().
@@ -42,7 +36,13 @@ func (v *Error) Error() string {
 	if len(v.path) > 0 {
 		msg = strings.Join(v.path, "|") + ": " + msg
 	}
-	return msg
+
+	var prefix string
+	for _, p := range v.prefix {
+		prefix += "[" + serial.ToString(p) + "] "
+	}
+
+	return prefix + msg
 }
 
 // Inner implements hasInnerError.Inner()
@@ -58,28 +58,6 @@ func (v *Error) Base(err error) *Error {
 	return v
 }
 
-func (v *Error) WithContext(ctx context.Context) *Error {
-	v.ctx = ctx
-	return v
-}
-
-// Context returns the context that associated with the Error.
-func (v *Error) Context() context.Context {
-	if v.ctx != nil {
-		return v.ctx
-	}
-
-	if v.inner == nil {
-		return nil
-	}
-
-	if c, ok := v.inner.(hasContext); ok {
-		return c.Context()
-	}
-
-	return nil
-}
-
 func (v *Error) atSeverity(s log.Severity) *Error {
 	v.severity = s
 	return v
@@ -132,25 +110,29 @@ func (v *Error) String() string {
 }
 
 // WriteToLog writes current error into log.
-func (v *Error) WriteToLog() {
-	ctx := v.Context()
-	var sid session.ID
-	if ctx != nil {
-		sid = session.IDFromContext(ctx)
+func (v *Error) WriteToLog(opts ...ExportOption) {
+	var holder ExportOptionHolder
+
+	for _, opt := range opts {
+		opt(&holder)
 	}
-	var c interface{} = v
-	if sid > 0 {
-		c = sessionLog{
-			id:      sid,
-			content: v,
-		}
+
+	if holder.SessionID > 0 {
+		v.prefix = append(v.prefix, holder.SessionID)
 	}
+
 	log.Record(&log.GeneralMessage{
 		Severity: GetSeverity(v),
-		Content:  c,
+		Content:  v,
 	})
 }
 
+type ExportOptionHolder struct {
+	SessionID uint32
+}
+
+type ExportOption func(*ExportOptionHolder)
+
 // New returns a new error object with message formed from given arguments.
 func New(msg ...interface{}) *Error {
 	return &Error{
@@ -196,12 +178,3 @@ func GetSeverity(err error) log.Severity {
 	}
 	return log.Severity_Info
 }
-
-type sessionLog struct {
-	id      session.ID
-	content interface{}
-}
-
-func (s sessionLog) String() string {
-	return serial.Concat("[", s.id, "] ", s.content)
-}
diff --git a/common/session/request.go b/common/session/request.go
new file mode 100644
index 000000000..2b54047aa
--- /dev/null
+++ b/common/session/request.go
@@ -0,0 +1,6 @@
+package session
+
+type Request struct {
+	//Destination   net.Destination
+	DecodedLayers []interface{}
+}
diff --git a/common/session/session.go b/common/session/session.go
index e1be95766..b7b9042e1 100644
--- a/common/session/session.go
+++ b/common/session/session.go
@@ -4,6 +4,8 @@ package session // import "v2ray.com/core/common/session"
 import (
 	"context"
 	"math/rand"
+
+	"v2ray.com/core/common/errors"
 )
 
 // ID of a session.
@@ -38,3 +40,10 @@ func IDFromContext(ctx context.Context) ID {
 	}
 	return 0
 }
+
+func ExportIDToError(ctx context.Context) errors.ExportOption {
+	id := IDFromContext(ctx)
+	return func(h *errors.ExportOptionHolder) {
+		h.SessionID = uint32(id)
+	}
+}
diff --git a/proxy/dokodemo/dokodemo.go b/proxy/dokodemo/dokodemo.go
index 40bf3289d..e4f7154ba 100644
--- a/proxy/dokodemo/dokodemo.go
+++ b/proxy/dokodemo/dokodemo.go
@@ -10,6 +10,7 @@ import (
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/buf"
 	"v2ray.com/core/common/net"
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/common/signal"
 	"v2ray.com/core/common/task"
 	"v2ray.com/core/proxy"
@@ -54,7 +55,7 @@ func (d *DokodemoDoor) policy() core.Policy {
 }
 
 func (d *DokodemoDoor) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher core.Dispatcher) error {
-	newError("processing connection from: ", conn.RemoteAddr()).AtDebug().WithContext(ctx).WriteToLog()
+	newError("processing connection from: ", conn.RemoteAddr()).AtDebug().WriteToLog(session.ExportIDToError(ctx))
 	dest := net.Destination{
 		Network: network,
 		Address: d.address,
diff --git a/proxy/freedom/freedom.go b/proxy/freedom/freedom.go
index 91a68e071..c5ce3eda1 100644
--- a/proxy/freedom/freedom.go
+++ b/proxy/freedom/freedom.go
@@ -12,6 +12,7 @@ import (
 	"v2ray.com/core/common/dice"
 	"v2ray.com/core/common/net"
 	"v2ray.com/core/common/retry"
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/common/signal"
 	"v2ray.com/core/common/task"
 	"v2ray.com/core/proxy"
@@ -56,7 +57,7 @@ func (h *Handler) resolveIP(ctx context.Context, domain string) net.Address {
 
 	ips, err := h.dns.LookupIP(domain)
 	if err != nil {
-		newError("failed to get IP address for domain ", domain).Base(err).WithContext(ctx).WriteToLog()
+		newError("failed to get IP address for domain ", domain).Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
 	if len(ips) == 0 {
 		return nil
@@ -75,7 +76,7 @@ func (h *Handler) Process(ctx context.Context, link *core.Link, dialer proxy.Dia
 			Port:    net.Port(server.Port),
 		}
 	}
-	newError("opening connection to ", destination).WithContext(ctx).WriteToLog()
+	newError("opening connection to ", destination).WriteToLog(session.ExportIDToError(ctx))
 
 	input := link.Reader
 	output := link.Writer
@@ -88,7 +89,7 @@ func (h *Handler) Process(ctx context.Context, link *core.Link, dialer proxy.Dia
 				Address: ip,
 				Port:    destination.Port,
 			}
-			newError("changing destination to ", destination).WithContext(ctx).WriteToLog()
+			newError("changing destination to ", destination).WriteToLog(session.ExportIDToError(ctx))
 		}
 	}
 
diff --git a/proxy/http/server.go b/proxy/http/server.go
index f09ae875f..de96e9298 100755
--- a/proxy/http/server.go
+++ b/proxy/http/server.go
@@ -17,6 +17,7 @@ import (
 	"v2ray.com/core/common/log"
 	"v2ray.com/core/common/net"
 	http_proto "v2ray.com/core/common/protocol/http"
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/common/signal"
 	"v2ray.com/core/common/task"
 	"v2ray.com/core/transport/internet"
@@ -105,7 +106,7 @@ func (s *Server) Process(ctx context.Context, network net.Network, conn internet
 
 Start:
 	if err := conn.SetReadDeadline(time.Now().Add(s.policy().Timeouts.Handshake)); err != nil {
-		newError("failed to set read deadline").Base(err).WithContext(ctx).WriteToLog()
+		newError("failed to set read deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
 
 	request, err := http.ReadRequest(reader)
@@ -124,9 +125,9 @@ Start:
 		}
 	}
 
-	newError("request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]").WithContext(ctx).WriteToLog()
+	newError("request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]").WriteToLog(session.ExportIDToError(ctx))
 	if err := conn.SetReadDeadline(time.Time{}); err != nil {
-		newError("failed to clear read deadline").Base(err).WithContext(ctx).WriteToLog()
+		newError("failed to clear read deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
 
 	defaultPort := net.Port(80)
@@ -285,7 +286,7 @@ func (s *Server) handlePlainHTTP(ctx context.Context, request *http.Request, wri
 				result = nil
 			}
 		} else {
-			newError("failed to read response from ", request.Host).Base(err).AtWarning().WithContext(ctx).WriteToLog()
+			newError("failed to read response from ", request.Host).Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
 			response = &http.Response{
 				Status:        "Service Unavailable",
 				StatusCode:    503,
diff --git a/proxy/shadowsocks/client.go b/proxy/shadowsocks/client.go
index 3e8309448..8b1478a28 100644
--- a/proxy/shadowsocks/client.go
+++ b/proxy/shadowsocks/client.go
@@ -3,6 +3,7 @@ package shadowsocks
 import (
 	"context"
 
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/common/task"
 
 	"v2ray.com/core"
@@ -64,7 +65,7 @@ func (c *Client) Process(ctx context.Context, link *core.Link, dialer proxy.Dial
 	if err != nil {
 		return newError("failed to find an available destination").AtWarning().Base(err)
 	}
-	newError("tunneling request to ", destination, " via ", server.Destination()).WithContext(ctx).WriteToLog()
+	newError("tunneling request to ", destination, " via ", server.Destination()).WriteToLog(session.ExportIDToError(ctx))
 
 	defer conn.Close()
 
diff --git a/proxy/shadowsocks/server.go b/proxy/shadowsocks/server.go
index a8558fb0d..8c5b8961d 100644
--- a/proxy/shadowsocks/server.go
+++ b/proxy/shadowsocks/server.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"time"
 
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/common/task"
 
 	"v2ray.com/core"
@@ -86,7 +87,7 @@ func (s *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection
 			request, data, err := DecodeUDPPacket(s.user, payload)
 			if err != nil {
 				if source, ok := proxy.SourceFromContext(ctx); ok {
-					newError("dropping invalid UDP packet from: ", source).Base(err).WithContext(ctx).WriteToLog()
+					newError("dropping invalid UDP packet from: ", source).Base(err).WriteToLog(session.ExportIDToError(ctx))
 					log.Record(&log.AccessMessage{
 						From:   source,
 						To:     "",
@@ -99,13 +100,13 @@ func (s *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection
 			}
 
 			if request.Option.Has(RequestOptionOneTimeAuth) && s.account.OneTimeAuth == Account_Disabled {
-				newError("client payload enables OTA but server doesn't allow it").WithContext(ctx).WriteToLog()
+				newError("client payload enables OTA but server doesn't allow it").WriteToLog(session.ExportIDToError(ctx))
 				payload.Release()
 				continue
 			}
 
 			if !request.Option.Has(RequestOptionOneTimeAuth) && s.account.OneTimeAuth == Account_Enabled {
-				newError("client payload disables OTA but server forces it").WithContext(ctx).WriteToLog()
+				newError("client payload disables OTA but server forces it").WriteToLog(session.ExportIDToError(ctx))
 				payload.Release()
 				continue
 			}
@@ -119,14 +120,14 @@ func (s *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection
 					Reason: "",
 				})
 			}
-			newError("tunnelling request to ", dest).WithContext(ctx).WriteToLog()
+			newError("tunnelling request to ", dest).WriteToLog(session.ExportIDToError(ctx))
 
 			ctx = protocol.ContextWithUser(ctx, request.User)
 			udpServer.Dispatch(ctx, dest, data, func(payload *buf.Buffer) {
 				data, err := EncodeUDPPacket(request, payload.Bytes())
 				payload.Release()
 				if err != nil {
-					newError("failed to encode UDP packet").Base(err).AtWarning().WithContext(ctx).WriteToLog()
+					newError("failed to encode UDP packet").Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
 					return
 				}
 				defer data.Release()
@@ -164,7 +165,7 @@ func (s *Server) handleConnection(ctx context.Context, conn internet.Connection,
 		Status: log.AccessAccepted,
 		Reason: "",
 	})
-	newError("tunnelling request to ", dest).WithContext(ctx).WriteToLog()
+	newError("tunnelling request to ", dest).WriteToLog(session.ExportIDToError(ctx))
 
 	ctx = protocol.ContextWithUser(ctx, request.User)
 
diff --git a/proxy/socks/client.go b/proxy/socks/client.go
index ede7e6b49..8765b94e7 100644
--- a/proxy/socks/client.go
+++ b/proxy/socks/client.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"time"
 
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/common/task"
 
 	"v2ray.com/core"
@@ -66,7 +67,7 @@ func (c *Client) Process(ctx context.Context, link *core.Link, dialer proxy.Dial
 
 	defer func() {
 		if err := conn.Close(); err != nil {
-			newError("failed to closed connection").Base(err).WithContext(ctx).WriteToLog()
+			newError("failed to closed connection").Base(err).WriteToLog(session.ExportIDToError(ctx))
 		}
 	}()
 
@@ -89,7 +90,7 @@ func (c *Client) Process(ctx context.Context, link *core.Link, dialer proxy.Dial
 	}
 
 	if err := conn.SetDeadline(time.Now().Add(p.Timeouts.Handshake)); err != nil {
-		newError("failed to set deadline for handshake").Base(err).WithContext(ctx).WriteToLog()
+		newError("failed to set deadline for handshake").Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
 	udpRequest, err := ClientHandshake(request, conn, conn)
 	if err != nil {
@@ -97,7 +98,7 @@ func (c *Client) Process(ctx context.Context, link *core.Link, dialer proxy.Dial
 	}
 
 	if err := conn.SetDeadline(time.Time{}); err != nil {
-		newError("failed to clear deadline after handshake").Base(err).WithContext(ctx).WriteToLog()
+		newError("failed to clear deadline after handshake").Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
 
 	ctx, cancel := context.WithCancel(ctx)
diff --git a/proxy/socks/server.go b/proxy/socks/server.go
index bd3b165ca..cb46d230e 100644
--- a/proxy/socks/server.go
+++ b/proxy/socks/server.go
@@ -5,15 +5,15 @@ import (
 	"io"
 	"time"
 
-	"v2ray.com/core/common/task"
-
 	"v2ray.com/core"
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/buf"
 	"v2ray.com/core/common/log"
 	"v2ray.com/core/common/net"
 	"v2ray.com/core/common/protocol"
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/common/signal"
+	"v2ray.com/core/common/task"
 	"v2ray.com/core/proxy"
 	"v2ray.com/core/transport/internet"
 	"v2ray.com/core/transport/internet/udp"
@@ -69,7 +69,7 @@ func (s *Server) Process(ctx context.Context, network net.Network, conn internet
 
 func (s *Server) processTCP(ctx context.Context, conn internet.Connection, dispatcher core.Dispatcher) error {
 	if err := conn.SetReadDeadline(time.Now().Add(s.policy().Timeouts.Handshake)); err != nil {
-		newError("failed to set deadline").Base(err).WithContext(ctx).WriteToLog()
+		newError("failed to set deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
 
 	reader := &buf.BufferedReader{Reader: buf.NewReader(conn)}
@@ -78,12 +78,12 @@ func (s *Server) processTCP(ctx context.Context, conn internet.Connection, dispa
 	if !ok {
 		return newError("inbound entry point not specified")
 	}
-	session := &ServerSession{
+	svrSession := &ServerSession{
 		config: s.config,
 		port:   inboundDest.Port,
 	}
 
-	request, err := session.Handshake(reader, conn)
+	request, err := svrSession.Handshake(reader, conn)
 	if err != nil {
 		if source, ok := proxy.SourceFromContext(ctx); ok {
 			log.Record(&log.AccessMessage{
@@ -97,12 +97,12 @@ func (s *Server) processTCP(ctx context.Context, conn internet.Connection, dispa
 	}
 
 	if err := conn.SetReadDeadline(time.Time{}); err != nil {
-		newError("failed to clear deadline").Base(err).WithContext(ctx).WriteToLog()
+		newError("failed to clear deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
 
 	if request.Command == protocol.RequestCommandTCP {
 		dest := request.Destination()
-		newError("TCP Connect request to ", dest).WithContext(ctx).WriteToLog()
+		newError("TCP Connect request to ", dest).WriteToLog(session.ExportIDToError(ctx))
 		if source, ok := proxy.SourceFromContext(ctx); ok {
 			log.Record(&log.AccessMessage{
 				From:   source,
@@ -175,7 +175,7 @@ func (s *Server) handleUDPPayload(ctx context.Context, conn internet.Connection,
 	udpServer := udp.NewDispatcher(dispatcher)
 
 	if source, ok := proxy.SourceFromContext(ctx); ok {
-		newError("client UDP connection from ", source).WithContext(ctx).WriteToLog()
+		newError("client UDP connection from ", source).WriteToLog(session.ExportIDToError(ctx))
 	}
 
 	reader := buf.NewReader(conn)
@@ -189,7 +189,7 @@ func (s *Server) handleUDPPayload(ctx context.Context, conn internet.Connection,
 			request, err := DecodeUDPPacket(payload)
 
 			if err != nil {
-				newError("failed to parse UDP request").Base(err).WithContext(ctx).WriteToLog()
+				newError("failed to parse UDP request").Base(err).WriteToLog(session.ExportIDToError(ctx))
 				payload.Release()
 				continue
 			}
@@ -199,7 +199,7 @@ func (s *Server) handleUDPPayload(ctx context.Context, conn internet.Connection,
 				continue
 			}
 
-			newError("send packet to ", request.Destination(), " with ", payload.Len(), " bytes").AtDebug().WithContext(ctx).WriteToLog()
+			newError("send packet to ", request.Destination(), " with ", payload.Len(), " bytes").AtDebug().WriteToLog(session.ExportIDToError(ctx))
 			if source, ok := proxy.SourceFromContext(ctx); ok {
 				log.Record(&log.AccessMessage{
 					From:   source,
@@ -210,14 +210,14 @@ func (s *Server) handleUDPPayload(ctx context.Context, conn internet.Connection,
 			}
 
 			udpServer.Dispatch(ctx, request.Destination(), payload, func(payload *buf.Buffer) {
-				newError("writing back UDP response with ", payload.Len(), " bytes").AtDebug().WithContext(ctx).WriteToLog()
+				newError("writing back UDP response with ", payload.Len(), " bytes").AtDebug().WriteToLog(session.ExportIDToError(ctx))
 
 				udpMessage, err := EncodeUDPPacket(request, payload.Bytes())
 				payload.Release()
 
 				defer udpMessage.Release()
 				if err != nil {
-					newError("failed to write UDP response").AtWarning().Base(err).WithContext(ctx).WriteToLog()
+					newError("failed to write UDP response").AtWarning().Base(err).WriteToLog(session.ExportIDToError(ctx))
 				}
 
 				conn.Write(udpMessage.Bytes()) // nolint: errcheck
diff --git a/proxy/vmess/inbound/inbound.go b/proxy/vmess/inbound/inbound.go
index f2890c99b..73be09876 100644
--- a/proxy/vmess/inbound/inbound.go
+++ b/proxy/vmess/inbound/inbound.go
@@ -9,6 +9,7 @@ import (
 	"sync"
 	"time"
 
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/common/task"
 
 	"v2ray.com/core"
@@ -226,8 +227,8 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection i
 
 	reader := &buf.BufferedReader{Reader: buf.NewReader(connection)}
 
-	session := encoding.NewServerSession(h.clients, h.sessionHistory)
-	request, err := session.DecodeRequestHeader(reader)
+	svrSession := encoding.NewServerSession(h.clients, h.sessionHistory)
+	request, err := svrSession.DecodeRequestHeader(reader)
 
 	if err != nil {
 		if errors.Cause(err) != io.EOF {
@@ -261,10 +262,10 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection i
 		})
 	}
 
-	newError("received request for ", request.Destination()).WithContext(ctx).WriteToLog()
+	newError("received request for ", request.Destination()).WriteToLog(session.ExportIDToError(ctx))
 
 	if err := connection.SetReadDeadline(time.Time{}); err != nil {
-		newError("unable to set back read deadline").Base(err).WithContext(ctx).WriteToLog()
+		newError("unable to set back read deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
 
 	sessionPolicy = h.policyManager.ForLevel(request.User.Level)
@@ -281,7 +282,7 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection i
 
 	requestDone := func() error {
 		defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
-		return transferRequest(timer, session, request, reader, link.Writer)
+		return transferRequest(timer, svrSession, request, reader, link.Writer)
 	}
 
 	responseDone := func() error {
@@ -292,7 +293,7 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection i
 		response := &protocol.ResponseHeader{
 			Command: h.generateCommand(ctx, request),
 		}
-		return transferResponse(timer, session, request, response, link.Reader, writer)
+		return transferResponse(timer, svrSession, request, response, link.Reader, writer)
 	}
 
 	var requestDonePost = task.Single(requestDone, task.OnSuccess(task.Close(link.Writer)))
@@ -311,7 +312,7 @@ func (h *Handler) generateCommand(ctx context.Context, request *protocol.Request
 		if h.inboundHandlerManager != nil {
 			handler, err := h.inboundHandlerManager.GetHandler(ctx, tag)
 			if err != nil {
-				newError("failed to get detour handler: ", tag).Base(err).AtWarning().WithContext(ctx).WriteToLog()
+				newError("failed to get detour handler: ", tag).Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
 				return nil
 			}
 			proxyHandler, port, availableMin := handler.GetRandomInboundProxy()
@@ -321,7 +322,7 @@ func (h *Handler) generateCommand(ctx context.Context, request *protocol.Request
 					availableMin = 255
 				}
 
-				newError("pick detour handler for port ", port, " for ", availableMin, " minutes.").AtDebug().WithContext(ctx).WriteToLog()
+				newError("pick detour handler for port ", port, " for ", availableMin, " minutes.").AtDebug().WriteToLog(session.ExportIDToError(ctx))
 				user := inboundHandler.GetUser(request.User.Email)
 				if user == nil {
 					return nil
diff --git a/proxy/vmess/outbound/outbound.go b/proxy/vmess/outbound/outbound.go
index cc4a32f90..5b7e7d4a6 100644
--- a/proxy/vmess/outbound/outbound.go
+++ b/proxy/vmess/outbound/outbound.go
@@ -6,6 +6,7 @@ import (
 	"context"
 	"time"
 
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/common/task"
 
 	"v2ray.com/core/transport/pipe"
@@ -69,7 +70,7 @@ func (v *Handler) Process(ctx context.Context, link *core.Link, dialer proxy.Dia
 	if !ok {
 		return newError("target not specified").AtError()
 	}
-	newError("tunneling request to ", target, " via ", rec.Destination()).WithContext(ctx).WriteToLog()
+	newError("tunneling request to ", target, " via ", rec.Destination()).WriteToLog(session.ExportIDToError(ctx))
 
 	command := protocol.RequestCommandTCP
 	if target.Network == net.Network_UDP {
diff --git a/transport/internet/tcp/dialer.go b/transport/internet/tcp/dialer.go
index d90ed46e2..d4f1a9fcc 100644
--- a/transport/internet/tcp/dialer.go
+++ b/transport/internet/tcp/dialer.go
@@ -5,6 +5,7 @@ import (
 
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/net"
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/transport/internet"
 	"v2ray.com/core/transport/internet/tls"
 )
@@ -19,7 +20,7 @@ func getTCPSettingsFromContext(ctx context.Context) *Config {
 
 // Dial dials a new TCP connection to the given destination.
 func Dial(ctx context.Context, dest net.Destination) (internet.Connection, error) {
-	newError("dialing TCP to ", dest).WithContext(ctx).WriteToLog()
+	newError("dialing TCP to ", dest).WriteToLog(session.ExportIDToError(ctx))
 	src := internet.DialerSourceFromContext(ctx)
 
 	conn, err := internet.DialSystem(ctx, src, dest)
diff --git a/transport/internet/tcp/hub.go b/transport/internet/tcp/hub.go
index 51f3e5a1b..7b5809285 100644
--- a/transport/internet/tcp/hub.go
+++ b/transport/internet/tcp/hub.go
@@ -7,6 +7,7 @@ import (
 
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/net"
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/transport/internet"
 	"v2ray.com/core/transport/internet/tls"
 )
@@ -29,7 +30,7 @@ func ListenTCP(ctx context.Context, address net.Address, port net.Port, handler
 	if err != nil {
 		return nil, err
 	}
-	newError("listening TCP on ", address, ":", port).WithContext(ctx).WriteToLog()
+	newError("listening TCP on ", address, ":", port).WriteToLog(session.ExportIDToError(ctx))
 
 	tcpSettings := getTCPSettingsFromContext(ctx)
 
diff --git a/transport/internet/udp/dispatcher.go b/transport/internet/udp/dispatcher.go
index 792e92310..e07bb6b13 100644
--- a/transport/internet/udp/dispatcher.go
+++ b/transport/internet/udp/dispatcher.go
@@ -9,6 +9,7 @@ import (
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/buf"
 	"v2ray.com/core/common/net"
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/common/signal"
 )
 
@@ -72,13 +73,13 @@ func (v *Dispatcher) getInboundRay(dest net.Destination, callback ResponseCallba
 
 func (v *Dispatcher) Dispatch(ctx context.Context, destination net.Destination, payload *buf.Buffer, callback ResponseCallback) {
 	// TODO: Add user to destString
-	newError("dispatch request to: ", destination).AtDebug().WithContext(ctx).WriteToLog()
+	newError("dispatch request to: ", destination).AtDebug().WriteToLog(session.ExportIDToError(ctx))
 
 	conn := v.getInboundRay(destination, callback)
 	outputStream := conn.link.Writer
 	if outputStream != nil {
 		if err := outputStream.WriteMultiBuffer(buf.NewMultiBufferValue(payload)); err != nil {
-			newError("failed to write first UDP payload").Base(err).WithContext(ctx).WriteToLog()
+			newError("failed to write first UDP payload").Base(err).WriteToLog(session.ExportIDToError(ctx))
 			conn.cancel()
 			return
 		}
@@ -98,7 +99,7 @@ func handleInput(ctx context.Context, conn *connEntry, callback ResponseCallback
 
 		mb, err := input.ReadMultiBuffer()
 		if err != nil {
-			newError("failed to handle UDP input").Base(err).WithContext(ctx).WriteToLog()
+			newError("failed to handle UDP input").Base(err).WriteToLog(session.ExportIDToError(ctx))
 			conn.cancel()
 			return
 		}
diff --git a/transport/internet/websocket/dialer.go b/transport/internet/websocket/dialer.go
index f0f5ef2aa..873e9bd05 100644
--- a/transport/internet/websocket/dialer.go
+++ b/transport/internet/websocket/dialer.go
@@ -8,13 +8,14 @@ import (
 
 	"v2ray.com/core/common"
 	"v2ray.com/core/common/net"
+	"v2ray.com/core/common/session"
 	"v2ray.com/core/transport/internet"
 	"v2ray.com/core/transport/internet/tls"
 )
 
 // Dial dials a WebSocket connection to the given destination.
 func Dial(ctx context.Context, dest net.Destination) (internet.Connection, error) {
-	newError("creating connection to ", dest).WithContext(ctx).WriteToLog()
+	newError("creating connection to ", dest).WriteToLog(session.ExportIDToError(ctx))
 
 	conn, err := dialWebsocket(ctx, dest)
 	if err != nil {