diff --git a/context.go b/context.go
index 7923b6c..1db7285 100644
--- a/context.go
+++ b/context.go
@@ -13,6 +13,7 @@ type Context struct {
 	l *q5.ListHead
 	aborted bool
 	suspended bool
+	userData map[string]interface{}
 }
 
 func (this *Context) do() {
@@ -45,7 +46,11 @@ func (this *Context) Request(name string) *q5.XValue {
 }
 
 func (this *Context) Header(name string) string {
-	return ""
+	if val, ok := this.r.Header[name]; ok {
+		return val[0]
+	} else {
+		return ""
+	}
 }
 
 func (this *Context) Response(data string) {
@@ -64,8 +69,19 @@ func (this *Context) ResponseOk() {
 }
 
 func (this *Context) Set(key string, val interface{}) {
+	if this.userData == nil {
+		this.userData = make(map[string]interface{})
+	}
+	this.userData[key] = val
 }
 
 func (this *Context) Get(key string) interface{} {
-	return nil
+	if this.userData == nil {
+		return nil
+	}
+	if val, ok := this.userData[key]; ok {
+		return val
+	} else {
+		return nil
+	}
 }
diff --git a/httpserver.go b/httpserver.go
index e24af6c..1f4eee6 100644
--- a/httpserver.go
+++ b/httpserver.go
@@ -21,13 +21,19 @@ type HttpServer struct {
 	restHandlersMutex sync.RWMutex
 	restHandlers map[string]*q5.ListHead
 
+	groupHandlersMutex sync.RWMutex
+	groupHandlers map[string]*q5.ListHead
+
 	globalMiddlewareMutex sync.RWMutex
 	globalMiddlewareList q5.ListHead
+
+	currGroups []string
 }
 
 func (this *HttpServer) Init(serviceName string, logOutputTime int32) *HttpServer {
 	this.handlers = make(map[string]HandlerFunc)
 	this.restHandlers = make(map[string]*q5.ListHead)
+	this.groupHandlers = make(map[string]*q5.ListHead)
 	this.globalMiddlewareList.Init(nil)
 	this.RegisterRestHandle("/webapp/index", this.dispatchRequest)
 	this.RegisterHandle("Ops", "selfChecking",
@@ -111,13 +117,15 @@ func (this *HttpServer) RegisterRestHandle(pattern string,
 	defer this.restHandlersMutex.Unlock()
 
 	p := new(middleware)
-	p.entry.Init(nil)
+	p.entry.Init(p)
 	p.handlerFunc = handle
 	if l, ok := this.restHandlers[pattern]; ok {
 		l.AddTail(&p.entry)
+		this.applyCurrGroup(l)
 	} else {
 		l := q5.MakeListHead()
 		l.AddTail(&p.entry)
+		this.applyCurrGroup(l)
 		this.restHandlers[pattern] = l
 		http.HandleFunc(pattern,
 			func (w http.ResponseWriter, r *http.Request) {
@@ -150,16 +158,70 @@ func (this *HttpServer) installGlobalMiddleware() {
 	defer this.restHandlersMutex.Unlock()
 	defer this.globalMiddlewareMutex.Unlock()
 
-	/*for key, val := range this.restHandlers {
-
-	}*/
+	for _, l := range this.restHandlers {
+		this.globalMiddlewareList.ForEach_r(
+			func (data interface{}) bool {
+				m := data.(*middleware)
+				p := new(middleware)
+				p.entry.Init(p)
+				p.handlerFunc = m.handlerFunc
+				l.AddHead(&p.entry)
+				return true
+			})
+	}
 }
 
 func (this *HttpServer) UseGroupBegin(groupNames ...string) {
+	if this.currGroups != nil {
+		panic("")
+	}
+	this.currGroups = groupNames
 }
 
 func (this *HttpServer) UseGroupEnd() {
+	if this.currGroups == nil {
+		panic("")
+	}
+	this.currGroups = nil
+}
+
+func (this *HttpServer) applyCurrGroup(l *q5.ListHead) {
+	if this.currGroups != nil {
+		for _, groupName := range this.currGroups {
+			this.groupHandlersMutex.Lock()
+			defer this.groupHandlersMutex.Unlock()
+
+			gl, ok := this.groupHandlers[groupName];
+			if ok {
+				gl.ForEach_r(
+					func (data interface{}) bool {
+						m := data.(*middleware)
+						p := new(middleware)
+						p.entry.Init(p)
+						p.handlerFunc = m.handlerFunc
+						l.AddHead(&p.entry)
+						return true
+					})
+			} else {
+				panic("")
+			}
+		}
+	}
 }
 
 func (this *HttpServer) DefineGroup(groupName string, handlers ...HandlerFunc) {
+	this.groupHandlersMutex.Lock()
+	defer this.groupHandlersMutex.Unlock()
+
+	l, ok := this.groupHandlers[groupName];
+	if !ok {
+		l = q5.MakeListHead()
+		this.groupHandlers[groupName] = l
+	}
+	for i := 0; i < len(handlers); i++ {
+		p := new(middleware)
+		p.entry.Init(p)
+		p.handlerFunc = handlers[i]
+		l.AddTail(&p.entry)
+	}
 }