diff --git a/driver/scheduler/scheduler_fetch.go b/driver/scheduler/scheduler_fetch.go
index cb20bfa..3bf6e58 100644
--- a/driver/scheduler/scheduler_fetch.go
+++ b/driver/scheduler/scheduler_fetch.go
@@ -32,6 +32,7 @@ func (s *Scheduler) Fetch(demands []market.Demand) {
 	result, err := Assign(s.Leader, &request)
 	if err != nil {
 		log.Printf("%s Failed to allocate: %v", s.Leader, err)
+		time.Sleep(time.Millisecond * time.Duration(15000+rand.Int63n(5000)))
 	} else {
 		if len(result.Allocations) == 0 {
 			log.Printf("%s Failed to allocate any server.", s.Leader)
@@ -77,7 +78,7 @@ func Assign(leader string, request *resource.AllocationRequest) (*resource.Alloc
 		return nil, fmt.Errorf("/agent/assign result JSON unmarshal error:%v, json:%s", err, string(jsonBlob))
 	}
 	if ret.Error != "" {
-		return nil, fmt.Errorf("/agent/assign error:%v, json:%s", ret.Error, string(jsonBlob))
+		return nil, fmt.Errorf("/agent/assign error:%v", ret.Error)
 	}
 	return &ret, nil
 }
diff --git a/resource/resource.go b/resource/resource.go
index fac9442..5cd6a9b 100644
--- a/resource/resource.go
+++ b/resource/resource.go
@@ -1,6 +1,7 @@
 package resource
 
 import (
+	"fmt"
 	"net/http"
 	"net/url"
 	"strconv"
@@ -12,6 +13,10 @@ type ComputeResource struct {
 	MemoryMB int64 `json:"memoryMB,omitempty"`
 }
 
+func (a ComputeResource) String() string {
+	return fmt.Sprintf("CPUCount %d Level %d Memory %d MB", a.CPUCount, a.CPULevel, a.MemoryMB)
+}
+
 func (a ComputeResource) Minus(b ComputeResource) ComputeResource {
 	return ComputeResource{
 		CPUCount: a.CPUCount - b.CPUCount,
diff --git a/resource/service_discovery/leader/handler_agents.go b/resource/service_discovery/leader/handler_agents.go
index 0bfb368..2229fb7 100644
--- a/resource/service_discovery/leader/handler_agents.go
+++ b/resource/service_discovery/leader/handler_agents.go
@@ -11,51 +11,51 @@ import (
 	"strings"
 
 	"github.com/chrislusf/glow/resource"
-	"github.com/labstack/echo"
+	"github.com/chrislusf/glow/util"
 )
 
-func (tl *TeamLeader) listAgentsHandler(c *echo.Context) error {
-	c.JSON(http.StatusAccepted, tl.LeaderResource.Topology)
-	return nil
+func (tl *TeamLeader) listAgentsHandler(w http.ResponseWriter, r *http.Request) {
+	util.Json(w, r, http.StatusAccepted, tl.LeaderResource.Topology)
 }
 
-func (tl *TeamLeader) requestAgentHandler(c *echo.Context) error {
-	requestBlob := []byte(c.Request().FormValue("request"))
+func (tl *TeamLeader) requestAgentHandler(w http.ResponseWriter, r *http.Request) {
+	requestBlob := []byte(r.FormValue("request"))
 	var request resource.AllocationRequest
 	err := json.Unmarshal(requestBlob, &request)
 	if err != nil {
-		return fmt.Errorf("request JSON unmarshal error:%v, json:%s", err, string(requestBlob))
+		util.Error(w, r, http.StatusBadRequest, fmt.Sprintf("request JSON unmarshal error:%v, json:%s", err, string(requestBlob)))
+		return
 	}
 
-	fmt.Printf("request:\n%+v\n", request)
+	// fmt.Printf("request:\n%+v\n", request)
 
 	result := tl.allocate(&request)
-	fmt.Printf("result: %v\n%+v\n", result.Error, result.Allocations)
+	// fmt.Printf("result: %v\n%+v\n", result.Error, result.Allocations)
 	if result.Error != "" {
-		c.JSON(http.StatusNotFound, result)
+		util.Json(w, r, http.StatusNotFound, result)
+		return
 	}
 
-	c.JSON(http.StatusAccepted, result)
+	util.Json(w, r, http.StatusAccepted, result)
 
-	return nil
 }
 
-func (tl *TeamLeader) updateAgentHandler(c *echo.Context) error {
-	servicePortString := c.Request().FormValue("servicePort")
+func (tl *TeamLeader) updateAgentHandler(w http.ResponseWriter, r *http.Request) {
+	servicePortString := r.FormValue("servicePort")
 	servicePort, err := strconv.Atoi(servicePortString)
 	if err != nil {
 		log.Printf("Strange: servicePort not found: %s, %v", servicePortString, err)
 	}
-	host := c.Request().Host
+	host := r.Host
 	if strings.Contains(host, ":") {
 		host = host[0:strings.Index(host, ":")]
 	}
 	// println("received agent update from", host+":"+servicePort)
-	res, alloc := resource.NewComputeResourceFromRequest(c.Request())
+	res, alloc := resource.NewComputeResourceFromRequest(r)
 	ai := &resource.AgentInformation{
 		Location: resource.Location{
-			DataCenter: c.Request().FormValue("dataCenter"),
-			Rack:       c.Request().FormValue("rack"),
+			DataCenter: r.FormValue("dataCenter"),
+			Rack:       r.FormValue("rack"),
 			Server:     host,
 			Port:       servicePort,
 		},
@@ -67,7 +67,5 @@ func (tl *TeamLeader) updateAgentHandler(c *echo.Context) error {
 
 	tl.LeaderResource.UpdateAgentInformation(ai)
 
-	c.NoContent(http.StatusAccepted)
-
-	return nil
+	w.WriteHeader(http.StatusAccepted)
 }
diff --git a/resource/service_discovery/leader/handler_channels.go b/resource/service_discovery/leader/handler_channels.go
index 9c9a18b..adb7478 100644
--- a/resource/service_discovery/leader/handler_channels.go
+++ b/resource/service_discovery/leader/handler_channels.go
@@ -7,7 +7,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/labstack/echo"
+	"github.com/chrislusf/glow/util"
 )
 
 type ChannelInformation struct {
@@ -15,14 +15,22 @@ type ChannelInformation struct {
 	LastHeartBeat time.Time
 }
 
-func (tl *TeamLeader) listChannelsHandler(c *echo.Context) error {
-	path := c.P(0)
+func (tl *TeamLeader) handleChannel(w http.ResponseWriter, r *http.Request) {
+	if r.Method == "POST" {
+		tl.updateChannelHandler(w, r)
+	} else {
+		tl.listChannelsHandler(w, r)
+	}
+}
+
+func (tl *TeamLeader) listChannelsHandler(w http.ResponseWriter, r *http.Request) {
+	path := r.URL.Path[len("/channel/"):]
 
 	freshChannels := make([]*ChannelInformation, 0)
 	rps, ok := tl.channels[path]
 	if !ok {
-		c.JSON(http.StatusOK, freshChannels)
-		return nil
+		util.Json(w, r, http.StatusOK, freshChannels)
+		return
 	}
 	for _, rp := range rps {
 		if rp.LastHeartBeat.Add(TimeOutLimit * time.Second).After(time.Now()) {
@@ -35,19 +43,18 @@ func (tl *TeamLeader) listChannelsHandler(c *echo.Context) error {
 	tl.channelsLock.Lock()
 	tl.channels[path] = freshChannels
 	tl.channelsLock.Unlock()
-	c.JSON(http.StatusOK, freshChannels)
-	return nil
+	util.Json(w, r, http.StatusOK, freshChannels)
 }
 
 // put agent information list under a path
-func (tl *TeamLeader) updateChannelHandler(c *echo.Context) error {
-	servicePort := c.Request().FormValue("servicePort")
-	host := c.Request().Host
+func (tl *TeamLeader) updateChannelHandler(w http.ResponseWriter, r *http.Request) {
+	servicePort := r.FormValue("servicePort")
+	host := r.Host
 	if strings.Contains(host, ":") {
 		host = host[0:strings.Index(host, ":")]
 	}
 	location := host + ":" + servicePort
-	path := c.P(0)
+	path := r.URL.Path[len("/channel/"):]
 	// println(path, ":", location)
 
 	rps, ok := tl.channels[path]
@@ -72,10 +79,6 @@ func (tl *TeamLeader) updateChannelHandler(c *echo.Context) error {
 	tl.channels[path] = rps
 	tl.channelsLock.Unlock()
 
-	c.JSON(http.StatusAccepted, tl.channels)
+	util.Json(w, r, http.StatusAccepted, tl.channels)
 
-	// id, _ := strconv.Atoi(c.Param("url"))
-	// utils.WriteJson(c, http.StatusOK, infos)
-	// c.String(http.StatusOK, c.P(0)+" runs at "+location.String()+".")
-	return nil
 }
diff --git a/resource/service_discovery/leader/leader.go b/resource/service_discovery/leader/leader.go
index f749f75..92a964c 100644
--- a/resource/service_discovery/leader/leader.go
+++ b/resource/service_discovery/leader/leader.go
@@ -6,7 +6,7 @@ import (
 	"net/http"
 	"sync"
 
-	"github.com/labstack/echo"
+	"github.com/chrislusf/glow/util"
 )
 
 type TeamLeader struct {
@@ -16,12 +16,10 @@ type TeamLeader struct {
 	LeaderResource *LeaderResource
 }
 
-func (tl *TeamLeader) statusHandler(c *echo.Context) error {
+func (tl *TeamLeader) statusHandler(w http.ResponseWriter, r *http.Request) {
 	infos := make(map[string]interface{})
 	infos["Version"] = "0.001"
-	// utils.WriteJson(c, http.StatusOK, infos)
-	c.String(http.StatusOK, "Hello World")
-	return nil
+	util.Json(w, r, http.StatusOK, infos)
 }
 
 func RunLeader(listenOn string) {
@@ -29,12 +27,12 @@ func RunLeader(listenOn string) {
 	tl.channels = make(map[string][]*ChannelInformation)
 	tl.LeaderResource = NewLeaderResource()
 
-	e := echo.New()
-	e.Get("/", tl.statusHandler)
-	e.Post("/agent/assign", tl.requestAgentHandler)
-	e.Post("/agent/update", tl.updateAgentHandler)
-	e.Get("/agent/*", tl.listAgentsHandler)
-	e.Post("/channel/*", tl.updateChannelHandler)
-	e.Get("/channel/*", tl.listChannelsHandler)
-	e.Run(listenOn)
+	http.HandleFunc("/", tl.statusHandler)
+	http.HandleFunc("/agent/assign", tl.requestAgentHandler)
+	http.HandleFunc("/agent/update", tl.updateAgentHandler)
+	http.HandleFunc("/agent/", tl.listAgentsHandler)
+	http.HandleFunc("/channel/", tl.handleChannel)
+
+	http.ListenAndServe(listenOn, nil)
+
 }
diff --git a/resource/service_discovery/leader/leader_allocation.go b/resource/service_discovery/leader/leader_allocation.go
index aa2646e..a21b95b 100644
--- a/resource/service_discovery/leader/leader_allocation.go
+++ b/resource/service_discovery/leader/leader_allocation.go
@@ -40,7 +40,7 @@ func (tl *TeamLeader) allocateServersOnRack(dc *resource.DataCenter, rack *resou
 			}
 			request := requests[j]
 
-			fmt.Printf("available %v, requested %v\n", available, request.ComputeResource)
+			// fmt.Printf("available %v, requested %v\n", available, request.ComputeResource)
 			if available.Covers(request.ComputeResource) {
 				allocated = append(allocated, resource.Allocation{
 					Location:  agent.Location,
@@ -117,7 +117,7 @@ func (tl *TeamLeader) findDataCenter(req *resource.AllocationRequest) (*resource
 		}
 	}
 	if !found {
-		return nil, fmt.Errorf("Total compute resource is too big for any data center:%+v", totalComputeResource)
+		return nil, fmt.Errorf("Total compute resource is too big for any data center:%s", totalComputeResource)
 	}
 
 	// find a data center with unallocated resources
diff --git a/util/http_handler.go b/util/http_handler.go
new file mode 100644
index 0000000..8b99a58
--- /dev/null
+++ b/util/http_handler.go
@@ -0,0 +1,46 @@
+package util
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+func Error(w http.ResponseWriter, r *http.Request, httpStatus int, obj string) (err error) {
+	return Json(w, r, httpStatus, map[string]string{
+		"error": obj,
+	})
+}
+
+func Json(w http.ResponseWriter, r *http.Request, httpStatus int, obj interface{}) (err error) {
+	var bytes []byte
+	if r.FormValue("pretty") != "" {
+		bytes, err = json.MarshalIndent(obj, "", "  ")
+	} else {
+		bytes, err = json.Marshal(obj)
+	}
+	if err != nil {
+		return
+	}
+	callback := r.FormValue("callback")
+	if callback == "" {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(httpStatus)
+		_, err = w.Write(bytes)
+	} else {
+		w.Header().Set("Content-Type", "application/javascript")
+		w.WriteHeader(httpStatus)
+		if _, err = w.Write([]uint8(callback)); err != nil {
+			return
+		}
+		if _, err = w.Write([]uint8("(")); err != nil {
+			return
+		}
+		fmt.Fprint(w, string(bytes))
+		if _, err = w.Write([]uint8(")")); err != nil {
+			return
+		}
+	}
+
+	return
+}