diff --git a/agent/agent.go b/agent/agent.go
index b4f1bf0b..316e65f0 100644
--- a/agent/agent.go
+++ b/agent/agent.go
@@ -14,7 +14,6 @@ import (
 	"time"
 
 	log "github.com/Sirupsen/logrus"
-	"github.com/gin-gonic/gin"
 
 	"github.com/Dataman-Cloud/swan/agent/ipam"
 	"github.com/Dataman-Cloud/swan/agent/janitor"
@@ -202,12 +201,7 @@ func (agent *Agent) ServeApi(l net.Listener) error {
 	return httpd.Serve(l)
 }
 
-func (agent *Agent) serveProxy(ctx *gin.Context) {
-	var (
-		r = ctx.Request
-		w = ctx.Writer
-	)
-
+func (agent *Agent) serveProxy(w http.ResponseWriter, r *http.Request) {
 	hijacker, ok := w.(http.Hijacker)
 	if !ok {
 		w.WriteHeader(500)
diff --git a/agent/api.go b/agent/api.go
index 2b40e2bc..388ca255 100644
--- a/agent/api.go
+++ b/agent/api.go
@@ -1,93 +1,95 @@
 package agent
 
 import (
+	"encoding/json"
 	"net/http"
 
-	"github.com/gin-gonic/gin"
+	"github.com/gorilla/mux"
 )
 
 func (agent *Agent) NewHTTPMux() http.Handler {
-	mux := gin.Default()
-	gin.SetMode(gin.ReleaseMode)
+	m := mux.NewRouter()
 
-	mux.GET("/sysinfo", agent.sysinfo)
-	mux.GET("/configs", agent.showConfigs)
+	m.Path("/sysinfo").Methods("GET").HandlerFunc(agent.sysinfo)
+	m.Path("/configs").Methods("GET").HandlerFunc(agent.showConfigs)
 
 	// /proxy/**
 	if agent.config.Janitor.Enabled {
-		agent.setupProxyHandlers(mux)
+		agent.setupProxyHandlers(m)
 	}
 
 	// /dns/**
 	if agent.config.DNS.Enabled {
-		agent.setupDNSHandlers(mux)
+		agent.setupDNSHandlers(m)
 	}
 
 	// /ipam/**
 	if agent.config.IPAM.Enabled {
-		agent.setupIPAMHandlers(mux)
+		agent.setupIPAMHandlers(m)
 	}
 
-	mux.NoRoute(agent.serveProxy)
-	return mux
+	m.NotFoundHandler = http.HandlerFunc(agent.serveProxy)
+
+	return m
 }
 
-func (agent *Agent) setupProxyHandlers(mux *gin.Engine) {
+func (agent *Agent) setupProxyHandlers(mux *mux.Router) {
 	var (
 		janitor = agent.janitor
 	)
 
-	r := mux.Group("/proxy")
-	r.GET("", janitor.ListUpstreams)
-	r.GET("/upstreams", janitor.ListUpstreams)
-	r.GET("/upstreams/:uid", janitor.GetUpstream)
-	r.PUT("/upstreams", janitor.UpsertUpstream)
-	r.DELETE("/upstreams", janitor.DelUpstream)
-	r.GET("/sessions", janitor.ListSessions)
-	r.GET("/configs", janitor.ShowConfigs)
-	r.GET("/stats", janitor.ShowStats)
-	r.GET("/stats/:uid", janitor.ShowUpstreamStats)
-	r.GET("/stats/:uid/:bid", janitor.ShowBackendStats)
+	r := mux.PathPrefix("/proxy").Subrouter()
+	r.Path("").Methods("GET").HandlerFunc(janitor.ListUpstreams)
+	r.Path("/upstreams").Methods("GET").HandlerFunc(janitor.ListUpstreams)
+	r.Path("/upstreams/{uid}").Methods("GET").HandlerFunc(janitor.GetUpstream)
+	r.Path("/upstreams").Methods("PUT").HandlerFunc(janitor.UpsertUpstream)
+	r.Path("/upstreams").Methods("DELETE").HandlerFunc(janitor.DelUpstream)
+	r.Path("/sessions").Methods("GET").HandlerFunc(janitor.ListSessions)
+	r.Path("/configs").Methods("GET").HandlerFunc(janitor.ShowConfigs)
+	r.Path("/stats").Methods("GET").HandlerFunc(janitor.ShowStats)
+	r.Path("/stats/{uid}").Methods("GET").HandlerFunc(janitor.ShowUpstreamStats)
+	r.Path("/stats/{uid}/{bid}").Methods("GET").HandlerFunc(janitor.ShowBackendStats)
 }
 
-func (agent *Agent) setupDNSHandlers(mux *gin.Engine) {
+func (agent *Agent) setupDNSHandlers(mux *mux.Router) {
 	var (
 		resolver = agent.resolver
 	)
 
-	r := mux.Group("/dns")
-	r.GET("", resolver.ListRecords)
-	r.GET("/records", resolver.ListRecords)
-	r.GET("/records/:id", resolver.GetRecord)
-	r.PUT("/records", resolver.UpsertRecord)
-	r.DELETE("/records", resolver.DelRecord)
-	r.GET("/configs", resolver.ShowConfigs)
-	r.GET("/stats", resolver.ShowStats)
-	r.GET("/stats/:id", resolver.ShowParentStats)
-
+	r := mux.PathPrefix("/dns").Subrouter()
+	r.Path("").Methods("GET").HandlerFunc(resolver.ListRecords)
+	r.Path("/records").Methods("GET").HandlerFunc(resolver.ListRecords)
+	r.Path("/records/{id}").Methods("GET").HandlerFunc(resolver.GetRecord)
+	r.Path("/records").Methods("PUT").HandlerFunc(resolver.UpsertRecord)
+	r.Path("/records").Methods("DELETE").HandlerFunc(resolver.DelRecord)
+	r.Path("/configs").Methods("GET").HandlerFunc(resolver.ShowConfigs)
+	r.Path("/stats").Methods("GET").HandlerFunc(resolver.ShowStats)
+	r.Path("/stats/{id}").Methods("GET").HandlerFunc(resolver.ShowParentStats)
 }
 
-func (agent *Agent) setupIPAMHandlers(mux *gin.Engine) {
+func (agent *Agent) setupIPAMHandlers(mux *mux.Router) {
 	var (
 		ipam = agent.ipam
 	)
 
-	r := mux.Group("/ipam")
-	r.GET("", ipam.ListSubNets)
-	r.GET("subnets", ipam.ListSubNets)
-	r.PUT("subnets", ipam.SetSubNetPool)
+	r := mux.PathPrefix("/ipam").Subrouter()
+	r.Path("").Methods("GET").HandlerFunc(ipam.ListSubNets)
+	r.Path("/subnets").Methods("GET").HandlerFunc(ipam.ListSubNets)
+	r.Path("/subnets").Methods("PUT").HandlerFunc(ipam.SetSubNetPool)
 }
 
-func (agent *Agent) sysinfo(ctx *gin.Context) {
+func (agent *Agent) sysinfo(w http.ResponseWriter, r *http.Request) {
 	info, err := Gather()
 	if err != nil {
-		http.Error(ctx.Writer, err.Error(), http.StatusInternalServerError)
+		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
 
-	ctx.JSON(200, info)
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(info)
 }
 
-func (agent *Agent) showConfigs(ctx *gin.Context) {
-	ctx.JSON(200, agent.config)
+func (agent *Agent) showConfigs(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(agent.config)
 }
diff --git a/agent/ipam/api.go b/agent/ipam/api.go
index 3b289c32..60fa6d8c 100644
--- a/agent/ipam/api.go
+++ b/agent/ipam/api.go
@@ -1,15 +1,14 @@
 package ipam
 
 import (
+	"encoding/json"
 	"net/http"
-
-	"github.com/gin-gonic/gin"
 )
 
-func (m *IPAM) ListSubNets(c *gin.Context) {
+func (m *IPAM) ListSubNets(w http.ResponseWriter, r *http.Request) {
 	subnets, err := m.store.ListSubNets()
 	if err != nil {
-		http.Error(c.Writer, err.Error(), 500)
+		http.Error(w, err.Error(), 500)
 		return
 	}
 
@@ -31,23 +30,24 @@ func (m *IPAM) ListSubNets(c *gin.Context) {
 		}
 	}
 
-	c.JSON(200, ret)
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(ret)
 }
 
-func (m *IPAM) SetSubNetPool(c *gin.Context) {
+func (m *IPAM) SetSubNetPool(w http.ResponseWriter, r *http.Request) {
 	var pool *IPPoolRange
-	if err := c.BindJSON(&pool); err != nil {
-		http.Error(c.Writer, err.Error(), 400)
+	if err := json.NewDecoder(r.Body).Decode(&pool); err != nil {
+		http.Error(w, err.Error(), 400)
 		return
 	}
 
 	if err := pool.Valid(); err != nil {
-		http.Error(c.Writer, err.Error(), 400)
+		http.Error(w, err.Error(), 400)
 		return
 	}
 
 	if err := m.SetIPPool(pool); err != nil {
-		http.Error(c.Writer, err.Error(), 500)
+		http.Error(w, err.Error(), 500)
 		return
 	}
 }
diff --git a/agent/janitor/api.go b/agent/janitor/api.go
index 0474e38d..21c0e760 100644
--- a/agent/janitor/api.go
+++ b/agent/janitor/api.go
@@ -1,21 +1,23 @@
 package janitor
 
 import (
+	"encoding/json"
 	"net/http"
 
-	"github.com/gin-gonic/gin"
-
 	"github.com/Dataman-Cloud/swan/agent/janitor/stats"
 	"github.com/Dataman-Cloud/swan/agent/janitor/upstream"
+
+	"github.com/gorilla/mux"
 )
 
-func (s *JanitorServer) ListUpstreams(c *gin.Context) {
-	c.JSON(200, upstream.AllUpstreams())
+func (s *JanitorServer) ListUpstreams(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(upstream.AllUpstreams())
 }
 
-func (s *JanitorServer) GetUpstream(c *gin.Context) {
+func (s *JanitorServer) GetUpstream(w http.ResponseWriter, r *http.Request) {
 	var (
-		uid = c.Param("uid")
+		uid = mux.Vars(r)["uid"]
 		m   = upstream.AllUpstreams()
 		ret = new(upstream.Upstream)
 	)
@@ -27,74 +29,88 @@ func (s *JanitorServer) GetUpstream(c *gin.Context) {
 		}
 	}
 
-	c.JSON(200, ret)
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(ret)
 }
 
-func (s *JanitorServer) UpsertUpstream(c *gin.Context) {
+func (s *JanitorServer) UpsertUpstream(w http.ResponseWriter, r *http.Request) {
 	var cmb *upstream.BackendCombined
-	if err := c.BindJSON(&cmb); err != nil {
-		http.Error(c.Writer, err.Error(), 400)
+	if err := json.NewDecoder(r.Body).Decode(&cmb); err != nil {
+		http.Error(w, err.Error(), 400)
 		return
 	}
 
 	if err := cmb.Valid(); err != nil {
-		http.Error(c.Writer, err.Error(), 400)
+		http.Error(w, err.Error(), 400)
 		return
 	}
 
 	if err := s.UpsertBackend(cmb); err != nil {
-		http.Error(c.Writer, err.Error(), 500)
+		http.Error(w, err.Error(), 500)
 		return
 	}
 
-	c.Writer.WriteHeader(201)
+	w.WriteHeader(http.StatusCreated)
 }
 
-func (s *JanitorServer) DelUpstream(c *gin.Context) {
+func (s *JanitorServer) DelUpstream(w http.ResponseWriter, r *http.Request) {
 	var cmb *upstream.BackendCombined
-	if err := c.BindJSON(&cmb); err != nil {
-		http.Error(c.Writer, err.Error(), 400)
+	if err := json.NewDecoder(r.Body).Decode(&cmb); err != nil {
+		http.Error(w, err.Error(), 400)
 		return
 	}
 
 	s.removeBackend(cmb)
-	c.Writer.WriteHeader(204)
+	w.WriteHeader(http.StatusNoContent)
 }
 
-func (s *JanitorServer) ListSessions(c *gin.Context) {
-	c.JSON(200, upstream.AllSessions())
+func (s *JanitorServer) ListSessions(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(upstream.AllSessions())
 }
 
-func (s *JanitorServer) ShowConfigs(c *gin.Context) {
-	c.JSON(200, s.config)
+func (s *JanitorServer) ShowConfigs(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(s.config)
 }
 
-func (s *JanitorServer) ShowStats(c *gin.Context) {
+func (s *JanitorServer) ShowStats(w http.ResponseWriter, r *http.Request) {
 	wrapper := map[string]interface{}{
 		"httpd":    s.config.ListenAddr,
 		"httpdTLS": s.config.TLSListenAddr,
 		"counter":  stats.Get(),
 		"tcpd":     s.tcpd,
 	}
-	c.JSON(200, wrapper)
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(wrapper)
 }
 
-func (s *JanitorServer) ShowUpstreamStats(c *gin.Context) {
-	uid := c.Param("uid")
+func (s *JanitorServer) ShowUpstreamStats(w http.ResponseWriter, r *http.Request) {
+	uid := mux.Vars(r)["uid"]
 	if m, ok := stats.UpstreamStats()[uid]; ok {
-		c.JSON(200, m)
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(m)
 		return
 	}
-	c.JSON(200, make(map[string]interface{}))
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(make(map[string]interface{}))
 }
 
-func (s *JanitorServer) ShowBackendStats(c *gin.Context) {
-	uid, bid := c.Param("uid"), c.Param("bid")
+func (s *JanitorServer) ShowBackendStats(w http.ResponseWriter, r *http.Request) {
+	var (
+		vars = mux.Vars(r)
+		uid  = vars["uid"]
+		bid  = vars["bid"]
+	)
+
 	if ups, ok := stats.UpstreamStats()[uid]; ok {
 		if backend, ok := ups[bid]; ok {
-			c.JSON(200, backend)
+			w.Header().Set("Content-Type", "application/json")
+			json.NewEncoder(w).Encode(backend)
 			return
 		}
 	}
-	c.JSON(200, make(map[string]interface{}))
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(make(map[string]interface{}))
 }
diff --git a/agent/resolver/api.go b/agent/resolver/api.go
index ce5672ad..fcfa0c34 100644
--- a/agent/resolver/api.go
+++ b/agent/resolver/api.go
@@ -1,70 +1,78 @@
 package resolver
 
 import (
+	"encoding/json"
 	"net/http"
 
-	"github.com/gin-gonic/gin"
+	"github.com/gorilla/mux"
 )
 
-func (s *Resolver) ListRecords(c *gin.Context) {
-	c.JSON(200, s.allRecords())
+func (s *Resolver) ListRecords(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(s.allRecords())
 }
 
-func (s *Resolver) GetRecord(c *gin.Context) {
+func (s *Resolver) GetRecord(w http.ResponseWriter, r *http.Request) {
 	var (
-		id  = c.Param("id")
-		m   = s.allRecords()
-		ret = make([]*Record, 0)
+		vars = mux.Vars(r)
+		id   = vars["id"]
+		m    = s.allRecords()
+		ret  = make([]*Record, 0)
 	)
 	if val, ok := m[id]; ok {
 		ret = val
 	}
-	c.JSON(200, ret)
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(ret)
 }
 
-func (s *Resolver) UpsertRecord(c *gin.Context) {
+func (s *Resolver) UpsertRecord(w http.ResponseWriter, r *http.Request) {
 	var record *Record
-	if err := c.BindJSON(&record); err != nil {
-		http.Error(c.Writer, err.Error(), 400)
+	if err := json.NewDecoder(r.Body).Decode(&record); err != nil {
+		http.Error(w, err.Error(), 400)
 		return
 	}
 
 	if err := s.Upsert(record); err != nil {
-		http.Error(c.Writer, err.Error(), 500)
+		http.Error(w, err.Error(), 500)
 		return
 	}
 
-	c.Writer.WriteHeader(201)
+	w.WriteHeader(http.StatusCreated)
 
 }
 
-func (s *Resolver) DelRecord(c *gin.Context) {
+func (s *Resolver) DelRecord(w http.ResponseWriter, r *http.Request) {
 	var record *Record
-	if err := c.BindJSON(&record); err != nil {
-		http.Error(c.Writer, err.Error(), 400)
+	if err := json.NewDecoder(r.Body).Decode(&record); err != nil {
+		http.Error(w, err.Error(), 400)
 		return
 	}
 
 	if s.remove(record) {
 		s.stats.Del(record.Parent)
 	}
-	c.Writer.WriteHeader(204)
+	w.WriteHeader(http.StatusNoContent)
 }
 
-func (s *Resolver) ShowConfigs(c *gin.Context) {
-	c.JSON(200, s.config)
+func (s *Resolver) ShowConfigs(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(s.config)
 }
 
-func (s *Resolver) ShowStats(c *gin.Context) {
-	c.JSON(200, s.stats.Get())
+func (s *Resolver) ShowStats(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(s.stats.Get())
 }
 
-func (s *Resolver) ShowParentStats(c *gin.Context) {
-	pid := c.Param("id")
+func (s *Resolver) ShowParentStats(w http.ResponseWriter, r *http.Request) {
+	pid := mux.Vars(r)["id"]
 	m := s.stats.Get()
 	if m, ok := m.Parents[pid]; ok {
-		c.JSON(200, m)
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(m)
 		return
 	}
-	c.JSON(200, make(map[string]interface{}))
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(make(map[string]interface{}))
 }
diff --git a/agent/resolver/resolver.go b/agent/resolver/resolver.go
index 4c528850..fc8f32e1 100644
--- a/agent/resolver/resolver.go
+++ b/agent/resolver/resolver.go
@@ -109,7 +109,8 @@ func (r *Resolver) handleLocal(w dns.ResponseWriter, req *dns.Msg) {
 		MsgHdr: dns.MsgHdr{
 			Authoritative:      true,
 			RecursionAvailable: r.config.RecurseOn,
-		}}
+		},
+	}
 	msg.SetReply(req)
 
 	var (