diff --git a/api/config.go b/api/config.go
index e5261a7..3cb09ea 100644
--- a/api/config.go
+++ b/api/config.go
@@ -54,7 +54,7 @@ func getConfig(ctx *gin.Context) {
 			if ok && ss != nil {
 				status := ss.Status()
 				svc.Status = &config.ServiceStatus{
-					CreateTime: status.CreateTime().UnixNano(),
+					CreateTime: status.CreateTime().Unix(),
 					State:      string(status.State()),
 				}
 				if st := status.Stats(); st != nil {
@@ -69,7 +69,7 @@ func getConfig(ctx *gin.Context) {
 				for _, ev := range status.Events() {
 					if !ev.Time.IsZero() {
 						svc.Status.Events = append(svc.Status.Events, config.ServiceEvent{
-							Time: ev.Time.UnixNano(),
+							Time: ev.Time.Unix(),
 							Msg:  ev.Message,
 						})
 					}
diff --git a/config/config.go b/config/config.go
index c511738..bb05bda 100644
--- a/config/config.go
+++ b/config/config.go
@@ -359,13 +359,15 @@ type ForwardNodeConfig struct {
 	Bypasses []string        `yaml:",omitempty" json:"bypasses,omitempty"`
 	HTTP     *HTTPNodeConfig `yaml:",omitempty" json:"http,omitempty"`
 	TLS      *TLSNodeConfig  `yaml:",omitempty" json:"tls,omitempty"`
-	Auth     *AuthConfig     `yaml:",omitempty" json:"auth,omitempty"`
-	Metadata map[string]any  `yaml:",omitempty" json:"metadata,omitempty"`
+	// DEPRECATED by HTTP.Auth
+	Auth     *AuthConfig    `yaml:",omitempty" json:"auth,omitempty"`
+	Metadata map[string]any `yaml:",omitempty" json:"metadata,omitempty"`
 }
 
 type HTTPNodeConfig struct {
 	Host   string            `yaml:",omitempty" json:"host,omitempty"`
 	Header map[string]string `yaml:",omitempty" json:"header,omitempty"`
+	Auth   *AuthConfig       `yaml:",omitempty" json:"auth,omitempty"`
 }
 
 type TLSNodeConfig struct {
diff --git a/config/parsing/node/parse.go b/config/parsing/node/parse.go
index d1cc6ef..7f51e99 100644
--- a/config/parsing/node/parse.go
+++ b/config/parsing/node/parse.go
@@ -168,10 +168,28 @@ func ParseNode(hop string, cfg *config.NodeConfig, log logger.Logger) (*chain.No
 		chain.NetworkNodeOption(cfg.Network),
 	}
 	if cfg.HTTP != nil {
-		opts = append(opts, chain.HTTPNodeOption(&chain.HTTPNodeSettings{
+		settings := &chain.HTTPNodeSettings{
 			Host:   cfg.HTTP.Host,
 			Header: cfg.HTTP.Header,
-		}))
+		}
+
+		auth := cfg.HTTP.Auth
+		if auth == nil {
+			auth = cfg.Auth
+		}
+		if auth != nil {
+			settings.Auther = xauth.NewAuthenticator(
+				xauth.AuthsOption(map[string]string{auth.Username: auth.Password}),
+				xauth.LoggerOption(log.WithFields(map[string]any{
+					"kind":     "node",
+					"node":     cfg.Name,
+					"addr":     cfg.Addr,
+					"host":     cfg.Host,
+					"protocol": cfg.Protocol,
+				})),
+			)
+		}
+		opts = append(opts, chain.HTTPNodeOption(settings))
 	}
 	if cfg.TLS != nil {
 		tlsCfg := &chain.TLSNodeSettings{
@@ -185,18 +203,5 @@ func ParseNode(hop string, cfg *config.NodeConfig, log logger.Logger) (*chain.No
 		}
 		opts = append(opts, chain.TLSNodeOption(tlsCfg))
 	}
-	if cfg.Auth != nil {
-		opts = append(opts, chain.AutherNodeOption(
-			xauth.NewAuthenticator(
-				xauth.AuthsOption(map[string]string{cfg.Auth.Username: cfg.Auth.Password}),
-				xauth.LoggerOption(logger.Default().WithFields(map[string]any{
-					"kind":     "node",
-					"node":     cfg.Name,
-					"addr":     cfg.Addr,
-					"host":     cfg.Host,
-					"protocol": cfg.Protocol,
-				})),
-			)))
-	}
 	return chain.NewNode(cfg.Name, cfg.Addr, opts...), nil
 }
diff --git a/connector/tunnel/bind.go b/connector/tunnel/bind.go
index 9370184..b9f5164 100644
--- a/connector/tunnel/bind.go
+++ b/connector/tunnel/bind.go
@@ -27,7 +27,8 @@ func (c *tunnelConnector) Bind(ctx context.Context, conn net.Conn, network, addr
 		"endpoint": endpoint,
 		"tunnel":   c.md.tunnelID.String(),
 	})
-	log.Infof("create tunnel on %s/%s OK, tunnel=%s, connector=%s", addr, network, c.md.tunnelID.String(), cid)
+	log.Infof("create tunnel on %s/%s OK, tunnel=%s, connector=%s, weight=%d",
+		addr, network, c.md.tunnelID.String(), cid, cid.Weight())
 
 	session, err := mux.ServerSession(conn, c.md.muxCfg)
 	if err != nil {
@@ -72,7 +73,7 @@ func (c *tunnelConnector) initTunnel(conn net.Conn, network, address string) (ad
 	req.Features = append(req.Features, af) // dst address
 
 	req.Features = append(req.Features, &relay.TunnelFeature{
-		ID: c.md.tunnelID.ID(),
+		ID: c.md.tunnelID,
 	})
 	if _, err = req.WriteTo(conn); err != nil {
 		return
@@ -100,7 +101,7 @@ func (c *tunnelConnector) initTunnel(conn net.Conn, network, address string) (ad
 			}
 		case relay.FeatureTunnel:
 			if feature, _ := f.(*relay.TunnelFeature); feature != nil {
-				cid = relay.NewConnectorID(feature.ID[:])
+				cid = feature.ID
 			}
 		}
 	}
diff --git a/connector/tunnel/connector.go b/connector/tunnel/connector.go
index 8a1c6dc..2b4eb95 100644
--- a/connector/tunnel/connector.go
+++ b/connector/tunnel/connector.go
@@ -86,7 +86,7 @@ func (c *tunnelConnector) Connect(ctx context.Context, conn net.Conn, network, a
 	req.Features = append(req.Features, af) // dst address
 
 	req.Features = append(req.Features, &relay.TunnelFeature{
-		ID: c.md.tunnelID.ID(),
+		ID: c.md.tunnelID,
 	})
 
 	if _, err := req.WriteTo(conn); err != nil {
diff --git a/connector/tunnel/metadata.go b/connector/tunnel/metadata.go
index d678b62..5163293 100644
--- a/connector/tunnel/metadata.go
+++ b/connector/tunnel/metadata.go
@@ -40,6 +40,10 @@ func (c *tunnelConnector) parseMetadata(md mdata.Metadata) (err error) {
 		c.md.tunnelID = relay.NewTunnelID(uuid[:])
 	}
 
+	if weight := mdutil.GetInt(md, "tunnel.weight"); weight > 0 {
+		c.md.tunnelID = c.md.tunnelID.SetWeight(uint8(weight))
+	}
+
 	c.md.muxCfg = &mux.Config{
 		Version:           mdutil.GetInt(md, "mux.version"),
 		KeepAliveInterval: mdutil.GetDuration(md, "mux.keepaliveInterval"),
diff --git a/go.mod b/go.mod
index cb0e2a0..fb19f2e 100644
--- a/go.mod
+++ b/go.mod
@@ -7,11 +7,11 @@ require (
 	github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d
 	github.com/gin-contrib/cors v1.5.0
 	github.com/gin-gonic/gin v1.9.1
-	github.com/go-gost/core v0.0.0-20240103125300-5a427b4eaf99
+	github.com/go-gost/core v0.0.0-20240127130604-04314fa08476
 	github.com/go-gost/gosocks4 v0.0.1
 	github.com/go-gost/gosocks5 v0.4.0
 	github.com/go-gost/plugin v0.0.0-20240103125338-9c84e29cb81a
-	github.com/go-gost/relay v0.4.1-0.20230916134211-828f314ddfe7
+	github.com/go-gost/relay v0.4.1-0.20240128081525-e36d5f4a8322
 	github.com/go-gost/tls-dissector v0.0.2-0.20220408131628-aac992c27451
 	github.com/go-redis/redis/v8 v8.11.5
 	github.com/gobwas/glob v0.2.3
@@ -23,7 +23,7 @@ require (
 	github.com/pion/dtls/v2 v2.2.6
 	github.com/pires/go-proxyproto v0.7.0
 	github.com/prometheus/client_golang v1.17.0
-	github.com/quic-go/quic-go v0.40.0
+	github.com/quic-go/quic-go v0.40.1
 	github.com/quic-go/webtransport-go v0.6.0
 	github.com/refraction-networking/utls v1.5.4
 	github.com/rs/xid v1.3.0
diff --git a/go.sum b/go.sum
index 365c584..ef09d24 100644
--- a/go.sum
+++ b/go.sum
@@ -49,16 +49,16 @@ github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE
 github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
 github.com/gin-gonic/gin v1.9.1 h1:4idEAncQnU5cB7BeOkPtxjfCSye0AAm1R0RVIqJ+Jmg=
 github.com/gin-gonic/gin v1.9.1/go.mod h1:hPrL7YrpYKXt5YId3A/Tnip5kqbEAP+KLuI3SUcPTeU=
-github.com/go-gost/core v0.0.0-20240103125300-5a427b4eaf99 h1:/0hmilnQBEDlOaRcO+TlwaHH8a5ig6nc2aAsU4FGZcw=
-github.com/go-gost/core v0.0.0-20240103125300-5a427b4eaf99/go.mod h1:ndkgWVYRLwupVaFFWv8ML1Nr8tD3xhHK245PLpUDg4E=
+github.com/go-gost/core v0.0.0-20240127130604-04314fa08476 h1:4TA4ErfFw2CsVv5K5oqqYpUn68aZFrV+ONb4aGPJ1QQ=
+github.com/go-gost/core v0.0.0-20240127130604-04314fa08476/go.mod h1:ndkgWVYRLwupVaFFWv8ML1Nr8tD3xhHK245PLpUDg4E=
 github.com/go-gost/gosocks4 v0.0.1 h1:+k1sec8HlELuQV7rWftIkmy8UijzUt2I6t+iMPlGB2s=
 github.com/go-gost/gosocks4 v0.0.1/go.mod h1:3B6L47HbU/qugDg4JnoFPHgJXE43Inz8Bah1QaN9qCc=
 github.com/go-gost/gosocks5 v0.4.0 h1:EIrOEkpJez4gwHrMa33frA+hHXJyevjp47thpMQsJzI=
 github.com/go-gost/gosocks5 v0.4.0/go.mod h1:1G6I7HP7VFVxveGkoK8mnprnJqSqJjdcASKsdUn4Pp4=
 github.com/go-gost/plugin v0.0.0-20240103125338-9c84e29cb81a h1:ME7P1Brcg4C640DSPqlvQr7JuvvQfJ8QpmS3yCFlK3A=
 github.com/go-gost/plugin v0.0.0-20240103125338-9c84e29cb81a/go.mod h1:qXr2Zm9Ex2ATqnWuNUzVZqySPMnuIihvblYZt4MlZLw=
-github.com/go-gost/relay v0.4.1-0.20230916134211-828f314ddfe7 h1:qAG1OyjvdA5h221CfFSS3J359V3d2E7dJWyP29QoDSI=
-github.com/go-gost/relay v0.4.1-0.20230916134211-828f314ddfe7/go.mod h1:lcX+23LCQ3khIeASBo+tJ/WbwXFO32/N5YN6ucuYTG8=
+github.com/go-gost/relay v0.4.1-0.20240128081525-e36d5f4a8322 h1:R2a+Lx6XVvWdskGUUjteJ62WYBAskDHySgqNC6y8dI8=
+github.com/go-gost/relay v0.4.1-0.20240128081525-e36d5f4a8322/go.mod h1:lcX+23LCQ3khIeASBo+tJ/WbwXFO32/N5YN6ucuYTG8=
 github.com/go-gost/tls-dissector v0.0.2-0.20220408131628-aac992c27451 h1:xj8gUZGYO3nb5+6Bjw9+tsFkA9sYynrOvDvvC4uDV2I=
 github.com/go-gost/tls-dissector v0.0.2-0.20220408131628-aac992c27451/go.mod h1:/9QfdewqmHdaE362Hv5nDaSWLx3pCmtD870d6GaquXs=
 github.com/go-logr/logr v1.2.4 h1:g01GSCwiDw2xSZfjJ2/T9M+S6pFdcNtFYsp+Y43HYDQ=
@@ -182,8 +182,8 @@ github.com/quic-go/qpack v0.4.0 h1:Cr9BXA1sQS2SmDUWjSofMPNKmvF6IiIfDRmgU0w1ZCo=
 github.com/quic-go/qpack v0.4.0/go.mod h1:UZVnYIfi5GRk+zI9UMaCPsmZ2xKJP7XBUvVyT1Knj9A=
 github.com/quic-go/qtls-go1-20 v0.4.1 h1:D33340mCNDAIKBqXuAvexTNMUByrYmFYVfKfDN5nfFs=
 github.com/quic-go/qtls-go1-20 v0.4.1/go.mod h1:X9Nh97ZL80Z+bX/gUXMbipO6OxdiDi58b/fMC9mAL+k=
-github.com/quic-go/quic-go v0.40.0 h1:GYd1iznlKm7dpHD7pOVpUvItgMPo/jrMgDWZhMCecqw=
-github.com/quic-go/quic-go v0.40.0/go.mod h1:PeN7kuVJ4xZbxSv/4OX6S1USOX8MJvydwpTx31vx60c=
+github.com/quic-go/quic-go v0.40.1 h1:X3AGzUNFs0jVuO3esAGnTfvdgvL4fq655WaOi1snv1Q=
+github.com/quic-go/quic-go v0.40.1/go.mod h1:PeN7kuVJ4xZbxSv/4OX6S1USOX8MJvydwpTx31vx60c=
 github.com/quic-go/webtransport-go v0.6.0 h1:CvNsKqc4W2HljHJnoT+rMmbRJybShZ0YPFDD3NxaZLY=
 github.com/quic-go/webtransport-go v0.6.0/go.mod h1:9KjU4AEBqEQidGHNDkZrb8CAa1abRaosM2yGOyiikEc=
 github.com/refraction-networking/utls v1.5.4/go.mod h1:SPuDbBmgLGp8s+HLNc83FuavwZCFoMmExj+ltUHiHUw=
diff --git a/handler/forward/local/handler.go b/handler/forward/local/handler.go
index e3b743a..cc9e3f0 100644
--- a/handler/forward/local/handler.go
+++ b/handler/forward/local/handler.go
@@ -247,18 +247,19 @@ func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remot
 			})
 			log.Debugf("find node for host %s -> %s(%s)", req.Host, target.Name, target.Addr)
 
-			if auther := target.Options().Auther; auther != nil {
-				username, password, _ := req.BasicAuth()
-				id, ok := auther.Authenticate(ctx, username, password)
-				if !ok {
-					resp.StatusCode = http.StatusUnauthorized
-					resp.Header.Set("WWW-Authenticate", "Basic")
-					log.Warnf("node %s(%s) 401 unauthorized", target.Name, target.Addr)
-					return resp.Write(rw)
-				}
-				ctx = ctxvalue.ContextWithClientID(ctx, ctxvalue.ClientID(id))
-			}
 			if httpSettings := target.Options().HTTP; httpSettings != nil {
+				if auther := httpSettings.Auther; auther != nil {
+					username, password, _ := req.BasicAuth()
+					id, ok := auther.Authenticate(ctx, username, password)
+					if !ok {
+						resp.StatusCode = http.StatusUnauthorized
+						resp.Header.Set("WWW-Authenticate", "Basic")
+						log.Warnf("node %s(%s) 401 unauthorized", target.Name, target.Addr)
+						return resp.Write(rw)
+					}
+					ctx = ctxvalue.ContextWithClientID(ctx, ctxvalue.ClientID(id))
+				}
+
 				if httpSettings.Host != "" {
 					req.Host = httpSettings.Host
 				}
diff --git a/handler/forward/remote/handler.go b/handler/forward/remote/handler.go
index ea92caa..6766805 100644
--- a/handler/forward/remote/handler.go
+++ b/handler/forward/remote/handler.go
@@ -248,18 +248,18 @@ func (h *forwardHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, remot
 			})
 			log.Debugf("find node for host %s -> %s(%s)", req.Host, target.Name, target.Addr)
 
-			if auther := target.Options().Auther; auther != nil {
-				username, password, _ := req.BasicAuth()
-				id, ok := auther.Authenticate(ctx, username, password)
-				if !ok {
-					resp.StatusCode = http.StatusUnauthorized
-					resp.Header.Set("WWW-Authenticate", "Basic")
-					log.Warnf("node %s(%s) 401 unauthorized", target.Name, target.Addr)
-					return resp.Write(rw)
-				}
-				ctx = ctxvalue.ContextWithClientID(ctx, ctxvalue.ClientID(id))
-			}
 			if httpSettings := target.Options().HTTP; httpSettings != nil {
+				if auther := httpSettings.Auther; auther != nil {
+					username, password, _ := req.BasicAuth()
+					id, ok := auther.Authenticate(ctx, username, password)
+					if !ok {
+						resp.StatusCode = http.StatusUnauthorized
+						resp.Header.Set("WWW-Authenticate", "Basic")
+						log.Warnf("node %s(%s) 401 unauthorized", target.Name, target.Addr)
+						return resp.Write(rw)
+					}
+					ctx = ctxvalue.ContextWithClientID(ctx, ctxvalue.ClientID(id))
+				}
 				if httpSettings.Host != "" {
 					req.Host = httpSettings.Host
 				}
diff --git a/handler/tunnel/bind.go b/handler/tunnel/bind.go
index 188691b..aa76849 100644
--- a/handler/tunnel/bind.go
+++ b/handler/tunnel/bind.go
@@ -30,6 +30,8 @@ func (h *tunnelHandler) handleBind(ctx context.Context, conn net.Conn, network,
 	if network == "udp" {
 		connectorID = relay.NewUDPConnectorID(uuid[:])
 	}
+	// copy weight from tunnelID
+	connectorID = connectorID.SetWeight(tunnelID.Weight())
 
 	v := md5.Sum([]byte(tunnelID.String()))
 	endpoint := hex.EncodeToString(v[:8])
@@ -47,7 +49,7 @@ func (h *tunnelHandler) handleBind(ctx context.Context, conn net.Conn, network,
 	}
 	resp.Features = append(resp.Features, af,
 		&relay.TunnelFeature{
-			ID: connectorID.ID(),
+			ID: connectorID,
 		},
 	)
 	resp.WriteTo(conn)
@@ -84,7 +86,7 @@ func (h *tunnelHandler) handleBind(ctx context.Context, conn net.Conn, network,
 		}
 	}
 
-	log.Debugf("%s/%s: tunnel=%s, connector=%s established", addr, network, tunnelID, connectorID)
+	log.Debugf("%s/%s: tunnel=%s, connector=%s, weight=%d established", addr, network, tunnelID, connectorID, connectorID.Weight())
 
 	return
 }
diff --git a/handler/tunnel/handler.go b/handler/tunnel/handler.go
index af385e4..0d40624 100644
--- a/handler/tunnel/handler.go
+++ b/handler/tunnel/handler.go
@@ -216,7 +216,7 @@ func (h *tunnelHandler) Handle(ctx context.Context, conn net.Conn, opts ...handl
 			}
 		case relay.FeatureTunnel:
 			if feature, _ := f.(*relay.TunnelFeature); feature != nil {
-				tunnelID = relay.NewTunnelID(feature.ID[:])
+				tunnelID = feature.ID
 			}
 		case relay.FeatureNetwork:
 			if feature, _ := f.(*relay.NetworkFeature); feature != nil {
diff --git a/handler/tunnel/tunnel.go b/handler/tunnel/tunnel.go
index b71f6eb..7d3d432 100644
--- a/handler/tunnel/tunnel.go
+++ b/handler/tunnel/tunnel.go
@@ -3,16 +3,20 @@ package tunnel
 import (
 	"context"
 	"sync"
-	"sync/atomic"
 	"time"
 
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/core/sd"
 	"github.com/go-gost/relay"
 	"github.com/go-gost/x/internal/util/mux"
+	"github.com/go-gost/x/selector"
 	"github.com/google/uuid"
 )
 
+const (
+	MaxWeight uint8 = 0xff
+)
+
 type Connector struct {
 	id   relay.ConnectorID
 	tid  relay.TunnelID
@@ -67,11 +71,11 @@ type Tunnel struct {
 	id         relay.TunnelID
 	connectors []*Connector
 	t          time.Time
-	n          uint64
 	close      chan struct{}
 	mu         sync.RWMutex
 	sd         sd.SD
 	ttl        time.Duration
+	rw         *selector.RandomWeighted[*Connector]
 }
 
 func NewTunnel(node string, tid relay.TunnelID, ttl time.Duration) *Tunnel {
@@ -81,6 +85,7 @@ func NewTunnel(node string, tid relay.TunnelID, ttl time.Duration) *Tunnel {
 		t:     time.Now(),
 		close: make(chan struct{}),
 		ttl:   ttl,
+		rw:    selector.NewRandomWeighted[*Connector](),
 	}
 	if t.ttl <= 0 {
 		t.ttl = defaultTTL
@@ -112,21 +117,34 @@ func (t *Tunnel) GetConnector(network string) *Connector {
 	t.mu.RLock()
 	defer t.mu.RUnlock()
 
-	var connectors []*Connector
+	rw := t.rw
+	rw.Reset()
+
+	found := false
 	for _, c := range t.connectors {
 		if c.Session().IsClosed() {
 			continue
 		}
+
+		weight := c.ID().Weight()
+		if weight == 0 {
+			weight = 1
+		}
+
 		if network == "udp" && c.id.IsUDP() ||
 			network != "udp" && !c.id.IsUDP() {
-			connectors = append(connectors, c)
+			if weight == MaxWeight && !found {
+				rw.Reset()
+				found = true
+			}
+
+			if weight == MaxWeight || !found {
+				rw.Add(c, int(weight))
+			}
 		}
 	}
-	if len(connectors) == 0 {
-		return nil
-	}
-	n := atomic.AddUint64(&t.n, 1) - 1
-	return connectors[n%uint64(len(connectors))]
+
+	return rw.Next()
 }
 
 func (t *Tunnel) CloseOnIdle() bool {
diff --git a/hop/plugin/http.go b/hop/plugin/http.go
index 0025e01..9e77da8 100644
--- a/hop/plugin/http.go
+++ b/hop/plugin/http.go
@@ -24,10 +24,6 @@ type httpPluginRequest struct {
 	Src     string `json:"src"`
 }
 
-type httpPluginResponse struct {
-	Node string `json:"node"`
-}
-
 type httpPlugin struct {
 	name   string
 	url    string
@@ -101,18 +97,8 @@ func (p *httpPlugin) Select(ctx context.Context, opts ...hop.SelectOption) *chai
 		return nil
 	}
 
-	res := httpPluginResponse{}
-	if err := json.NewDecoder(resp.Body).Decode(&res); err != nil {
-		p.log.Error(resp.Status)
-		return nil
-	}
-
-	if res.Node == "" {
-		return nil
-	}
-
 	var cfg config.NodeConfig
-	if err := json.NewDecoder(bytes.NewReader([]byte(res.Node))).Decode(&cfg); err != nil {
+	if err := json.NewDecoder(resp.Body).Decode(&cfg); err != nil {
 		p.log.Error(err)
 		return nil
 	}
diff --git a/listener/udp/metadata.go b/listener/udp/metadata.go
index 2c7eeec..6cb7b30 100644
--- a/listener/udp/metadata.go
+++ b/listener/udp/metadata.go
@@ -27,7 +27,7 @@ func (l *udpListener) parseMetadata(md mdata.Metadata) (err error) {
 		readBufferSize = "readBufferSize"
 		readQueueSize  = "readQueueSize"
 		backlog        = "backlog"
-		keepAlive      = "keepAlive"
+		keepalive      = "keepalive"
 		ttl            = "ttl"
 	)
 
@@ -49,7 +49,7 @@ func (l *udpListener) parseMetadata(md mdata.Metadata) (err error) {
 	if l.md.backlog <= 0 {
 		l.md.backlog = defaultBacklog
 	}
-	l.md.keepalive = mdutil.GetBool(md, keepAlive)
+	l.md.keepalive = mdutil.GetBool(md, keepalive)
 
 	return
 }
diff --git a/selector/strategy.go b/selector/strategy.go
index 4a93448..fe4d886 100644
--- a/selector/strategy.go
+++ b/selector/strategy.go
@@ -35,7 +35,7 @@ func (s *roundRobinStrategy[T]) Apply(ctx context.Context, vs ...T) (v T) {
 }
 
 type randomStrategy[T any] struct {
-	rw *randomWeighted[T]
+	rw *RandomWeighted[T]
 	mu sync.Mutex
 }
 
@@ -43,7 +43,7 @@ type randomStrategy[T any] struct {
 // The node will be selected randomly.
 func RandomStrategy[T any]() selector.Strategy[T] {
 	return &randomStrategy[T]{
-		rw: newRandomWeighted[T](),
+		rw: NewRandomWeighted[T](),
 	}
 }
 
diff --git a/selector/weighted.go b/selector/weighted.go
index 956342e..bb50f2a 100644
--- a/selector/weighted.go
+++ b/selector/weighted.go
@@ -10,25 +10,25 @@ type randomWeightedItem[T any] struct {
 	weight int
 }
 
-type randomWeighted[T any] struct {
+type RandomWeighted[T any] struct {
 	items []*randomWeightedItem[T]
 	sum   int
 	r     *rand.Rand
 }
 
-func newRandomWeighted[T any]() *randomWeighted[T] {
-	return &randomWeighted[T]{
+func NewRandomWeighted[T any]() *RandomWeighted[T] {
+	return &RandomWeighted[T]{
 		r: rand.New(rand.NewSource(time.Now().UnixNano())),
 	}
 }
 
-func (rw *randomWeighted[T]) Add(item T, weight int) {
+func (rw *RandomWeighted[T]) Add(item T, weight int) {
 	ri := &randomWeightedItem[T]{item: item, weight: weight}
 	rw.items = append(rw.items, ri)
 	rw.sum += weight
 }
 
-func (rw *randomWeighted[T]) Next() (v T) {
+func (rw *RandomWeighted[T]) Next() (v T) {
 	if len(rw.items) == 0 {
 		return
 	}
@@ -46,7 +46,7 @@ func (rw *randomWeighted[T]) Next() (v T) {
 	return rw.items[len(rw.items)-1].item
 }
 
-func (rw *randomWeighted[T]) Reset() {
+func (rw *RandomWeighted[T]) Reset() {
 	rw.items = nil
 	rw.sum = 0
 }