refactor

client/httputil/helloworld.go

@@ -0,0 +1,9 @@
+package httputil
+
+import "net/http"
+
+func HelloWorld(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("hello world"))
+	})
+}

client/httputil/response.go

@@ -0,0 +1,17 @@
+package httputil
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+func WriteJSON(w http.ResponseWriter, status int, data interface{}) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	jsonBytes, err := json.Marshal(data)
+	if err != nil {
+		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+		return
+	}
+	w.Write(jsonBytes)
+}