server simplified to use pipelines

server.go

 	"net/http/httputil"
 	"net/url"
 	"os"
-	"reflect"
 	"sort"
 	"strings"
 )
 //answerWechatPost  distribute PostRequest according to xml body info
 func answerWechatPost(w http.ResponseWriter, r *http.Request) {
 	in, valid := readWechatInput(r)
-	//reply := "" //nothing
+	reply := "" //nothing
+	w.Header().Set("Content-Type", "text/xml; charset=utf-8")
+
 	if !valid {
 		log.Println("Error:  Invalid Input ")
+	} else {
+		//put into user session based pipeline
+		AllInMessage <- in
 	}
-
-	AllInMessage <- in
-
-	openID := in.header.FromUserName
-	if openID == "" {
-		log.Println("nothing")
-	}
-
-	//dummy reply
-	reply, _ := BuildTextMsg(openID, "澳")
-	w.Header().Set("Content-Type", "text/xml; charset=utf-8")
 	fmt.Fprint(w, reply)
-
-	//time.Sleep(5 * time.Second)
-	v := reflect.ValueOf(answerWechatPost)
-	log.Printf("Current Pointer: %d", v.Pointer())
-	//debug.PrintStack()
-
-	//load session into memory
-	// session := startSession(openID, in, w, r) //who , input what?
-	// session.ProcessInput()
-	// //put session back to disk
-	// session.Save()
 }
 
 // func (session) ProcessInput(w, r) {