diff --git a/client/src/environments/environment.ts b/client/src/environments/environment.ts
index 1a61762..33630d7 100644
--- a/client/src/environments/environment.ts
+++ b/client/src/environments/environment.ts
@@ -1,4 +1,4 @@
 export const environment = {
   production: true,
-  api: '',
+  api: 'https://recipe.taobin.io:8090/api/',
 };
diff --git a/server/data/data.go b/server/data/data.go
index 24e739f..a461406 100644
--- a/server/data/data.go
+++ b/server/data/data.go
@@ -7,6 +7,7 @@ import (
 	"path/filepath"
 	"recipe-manager/models"
 	"sort"
+	"time"
 )
 
 func readFile(version string) *models.Recipe {
@@ -32,10 +33,16 @@ func readFile(version string) *models.Recipe {
 	return data
 }
 
+type RecipeWithTimeStamps struct {
+	Recipe     models.Recipe
+	TimeStamps int64
+}
+
 type Data struct {
 	CurrentVersion string
 	AllVersions    []string
-	recipe         *models.Recipe
+	currentRecipe  *models.Recipe
+	recipeMap      map[string]RecipeWithTimeStamps
 }
 
 func NewData() *Data {
@@ -65,42 +72,102 @@ func NewData() *Data {
 		files[i] = filepath.Base(files[i])
 	}
 
+	defaultVersion := "coffeethai02_580.json"
+	defaultRecipe := readFile(defaultVersion)
+
 	return &Data{
-		CurrentVersion: "coffeethai02_580.json",
+		CurrentVersion: defaultVersion,
 		AllVersions:    files,
-		recipe:         readFile("coffeethai02_580.json"),
+		currentRecipe:  defaultRecipe,
+		recipeMap: map[string]RecipeWithTimeStamps{
+			defaultVersion: {
+				Recipe:     *defaultRecipe,
+				TimeStamps: time.Now().Unix(),
+			},
+		},
 	}
 }
 
 func (d *Data) GetRecipe(version string) models.Recipe {
 
 	if version == "" || version == d.CurrentVersion {
-		return *d.recipe
+		return *d.currentRecipe
 	}
 
 	log.Println("Change recipe to version:", version)
 
+	if recipe, ok := d.recipeMap[version]; ok {
+		d.CurrentVersion = version
+		return recipe.Recipe
+	}
+
 	// change current version and read new recipe
 	d.CurrentVersion = version
-	d.recipe = readFile(version)
-	return *d.recipe
+	d.currentRecipe = readFile(version)
+
+	// save to map
+	if len(d.recipeMap) > 5 { // limit keep in memory 5 version
+		// remove oldest version
+		var oldestVersion string
+		var oldestTime int64
+		for k, v := range d.recipeMap {
+			if oldestTime == 0 || v.TimeStamps < oldestTime {
+				oldestTime = v.TimeStamps
+				oldestVersion = k
+			}
+		}
+		delete(d.recipeMap, oldestVersion)
+	}
+
+	d.recipeMap[version] = RecipeWithTimeStamps{
+		Recipe:     *d.currentRecipe,
+		TimeStamps: time.Now().Unix(),
+	}
+
+	return *d.currentRecipe
 }
 
 func (d *Data) GetRecipe01() []models.Recipe01 {
-	return d.recipe.Recipe01
+	return d.currentRecipe.Recipe01
 }
 
 func (d *Data) GetMaterialSetting(version string) []models.MaterialSetting {
 	result := make([]models.MaterialSetting, 0)
 
 	if version == "" || version == d.CurrentVersion {
-		copy(result, d.recipe.MaterialSetting)
+		copy(result, d.currentRecipe.MaterialSetting)
+		return result
+	}
+
+	if recipe, ok := d.recipeMap[version]; ok {
+		copy(result, recipe.Recipe.MaterialSetting)
+		d.CurrentVersion = version
 		return result
 	}
 
 	d.CurrentVersion = version
-	d.recipe = readFile(version)
-	copy(result, d.recipe.MaterialSetting)
+	d.currentRecipe = readFile(version)
+
+	// save to map
+	if len(d.recipeMap) > 5 { // limit keep in memory 5 version
+		// remove oldest version
+		var oldestVersion string
+		var oldestTime int64
+		for k, v := range d.recipeMap {
+			if oldestTime == 0 || v.TimeStamps < oldestTime {
+				oldestTime = v.TimeStamps
+				oldestVersion = k
+			}
+		}
+		delete(d.recipeMap, oldestVersion)
+	}
+
+	d.recipeMap[version] = RecipeWithTimeStamps{
+		Recipe:     *d.currentRecipe,
+		TimeStamps: time.Now().Unix(),
+	}
+
+	copy(result, d.currentRecipe.MaterialSetting)
 	return result
 }
 
@@ -108,11 +175,34 @@ func (d *Data) GetMaterialCode(ids []uint64, version string) []models.MaterialCo
 	var result []models.MaterialCode
 
 	if version == "" || version == d.CurrentVersion {
-		result = d.recipe.MaterialCode
+		result = d.currentRecipe.MaterialCode
+	} else if recipe, ok := d.recipeMap[version]; ok {
+		d.CurrentVersion = version
+		return recipe.Recipe.MaterialCode
 	} else {
 		d.CurrentVersion = version
-		d.recipe = readFile(version)
-		result = d.recipe.MaterialCode
+		d.currentRecipe = readFile(version)
+
+		// save to map
+		if len(d.recipeMap) > 5 { // limit keep in memory 5 version
+			// remove oldest version
+			var oldestVersion string
+			var oldestTime int64
+			for k, v := range d.recipeMap {
+				if oldestTime == 0 || v.TimeStamps < oldestTime {
+					oldestTime = v.TimeStamps
+					oldestVersion = k
+				}
+			}
+			delete(d.recipeMap, oldestVersion)
+		}
+
+		d.recipeMap[version] = RecipeWithTimeStamps{
+			Recipe:     *d.currentRecipe,
+			TimeStamps: time.Now().Unix(),
+		}
+
+		result = d.currentRecipe.MaterialCode
 	}
 
 	if len(ids) == 0 {