diff --git a/entry/http/error.go b/entry/http/error.go
new file mode 100644
index 0000000..e9fe891
--- /dev/null
+++ b/entry/http/error.go
@@ -0,0 +1,13 @@
+package http
+
+const (
+	ErrAccessDenied         = 4003 //拒绝访问
+	ErrPermissionDenied     = 4004 //没有权限
+	ErrInvalidRequest       = 4005 //请求无效或不合法
+	ErrInvalidPayload       = 4006 //请求数据无效
+	ErrResourceCreate       = 8001 //资源创建失败
+	ErrResourceUpdate       = 8002 //资源更新失败
+	ErrResourceDelete       = 8003 //资源删除失败
+	ErrResourceNotFound     = 8004 //资源未找到
+	ErrTemporaryUnavailable = 8006 //临时性不可用
+)
diff --git a/instance.go b/instance.go
index 3428979..5feedea 100644
--- a/instance.go
+++ b/instance.go
@@ -3,6 +3,9 @@ package kos
 import (
 	"git.nspix.com/golang/kos/entry/cli"
 	"git.nspix.com/golang/kos/entry/http"
+	_ "git.nspix.com/golang/kos/util/fetch"
+	_ "git.nspix.com/golang/kos/util/random"
+	_ "git.nspix.com/golang/kos/util/reflection"
 	"sync"
 )
 
diff --git a/pkg/cache/cache.go b/pkg/cache/cache.go
index 4307407..3e15b6b 100644
--- a/pkg/cache/cache.go
+++ b/pkg/cache/cache.go
@@ -5,9 +5,14 @@ import (
 	"time"
 )
 
+type (
+	LoadFunc func(ctx context.Context) (any, error)
+)
+
 type Cache interface {
 	Set(ctx context.Context, key string, value any)
 	SetEx(ctx context.Context, key string, value any, expire time.Duration)
 	Get(ctx context.Context, key string) (value any, ok bool)
+	Try(ctx context.Context, key string, cb LoadFunc) (value any, err error)
 	Del(ctx context.Context, key string)
 }
diff --git a/pkg/cache/instance.go b/pkg/cache/instance.go
index 90c2396..3d0a236 100644
--- a/pkg/cache/instance.go
+++ b/pkg/cache/instance.go
@@ -29,6 +29,10 @@ func SetEx(ctx context.Context, key string, value any, expire time.Duration) {
 	std.SetEx(ctx, key, value, expire)
 }
 
+func Try(ctx context.Context, key string, cb LoadFunc) (value any, err error) {
+	return std.Try(ctx, key, cb)
+}
+
 func Get(ctx context.Context, key string) (value any, ok bool) {
 	return std.Get(ctx, key)
 }
diff --git a/pkg/cache/memcache.go b/pkg/cache/memcache.go
index a7f0c8d..d8061ae 100644
--- a/pkg/cache/memcache.go
+++ b/pkg/cache/memcache.go
@@ -2,14 +2,50 @@ package cache
 
 import (
 	"context"
+	"git.nspix.com/golang/kos/util/env"
 	"github.com/patrickmn/go-cache"
+	"os"
 	"time"
 )
 
+var (
+	memCacheDefaultExpired  time.Duration
+	memCacheCleanupInterval time.Duration
+)
+
+func init() {
+	memCacheDefaultExpired, _ = time.ParseDuration(env.Get("MEMCACHE_DEFAULT_EXPIRED", "1h"))
+	memCacheCleanupInterval, _ = time.ParseDuration(env.Get("MEMCACHE_CLEANUP_INTERVAL", "10m"))
+
+	if memCacheDefaultExpired < time.Second*5 {
+		memCacheDefaultExpired = time.Second * 5
+	}
+
+	if memCacheCleanupInterval < time.Minute {
+		memCacheCleanupInterval = time.Minute
+	}
+}
+
 type MemCache struct {
 	engine *cache.Cache
 }
 
+func (cache *MemCache) Try(ctx context.Context, key string, cb LoadFunc) (value any, err error) {
+	var (
+		ok bool
+	)
+	if value, ok = cache.engine.Get(key); ok {
+		return value, nil
+	}
+	if cb == nil {
+		return nil, os.ErrNotExist
+	}
+	if value, err = cb(ctx); err == nil {
+		cache.engine.Set(key, value, 0)
+	}
+	return
+}
+
 func (cache *MemCache) Set(ctx context.Context, key string, value any) {
 	cache.engine.Set(key, value, 0)
 }
@@ -28,6 +64,6 @@ func (cache *MemCache) Del(ctx context.Context, key string) {
 
 func NewMemCache() *MemCache {
 	return &MemCache{
-		engine: cache.New(time.Hour, time.Minute*10),
+		engine: cache.New(memCacheDefaultExpired, memCacheCleanupInterval),
 	}
 }
diff --git a/util/reflection/reflection.go b/util/reflection/reflection.go
new file mode 100644
index 0000000..a289f42
--- /dev/null
+++ b/util/reflection/reflection.go
@@ -0,0 +1,16 @@
+package reflection
+
+import "git.nspix.com/golang/kos/util/reflect"
+
+func Setter(hacky any, variables map[string]any) (err error) {
+	for k, v := range variables {
+		if err = Set(hacky, k, v); err != nil {
+			return err
+		}
+	}
+	return
+}
+
+func Set(hacky any, field string, value interface{}) (err error) {
+	return reflect.Set(hacky, field, value)
+}