diff --git a/server/src/config/init.go b/server/src/config/init.go
index a9e20ac..e724133 100644
--- a/server/src/config/init.go
+++ b/server/src/config/init.go
@@ -33,4 +33,6 @@ func init() {
 		fmt.Println(`OpenAI base URL is invalid.`)
 		panic(err)
 	}
+
+	os.MkdirAll(StaticDir+`/tmp`, 0777)
 }
diff --git a/server/src/core/fetch.go b/server/src/core/fetch.go
index 5335738..ea0cac3 100644
--- a/server/src/core/fetch.go
+++ b/server/src/core/fetch.go
@@ -8,7 +8,6 @@ import (
 	"net/url"
 	"project/config"
 	"project/util"
-	"project/zj"
 	"time"
 )
 
@@ -21,7 +20,7 @@ func (pr *row) fetchRemote() (ab []byte, ok bool, err error) {
 	if err != nil {
 		return nil, false, err
 	}
-	zj.J(`real url`, u.String())
+	// zj.J(`real url`, u.String())
 
 	req, err := http.NewRequest(r.Method, u.String(), bytes.NewReader(r.Body))
 	if err != nil {
diff --git a/server/src/core/metrics.go b/server/src/core/metrics.go
index bb7a9a8..665664d 100644
--- a/server/src/core/metrics.go
+++ b/server/src/core/metrics.go
@@ -22,7 +22,7 @@ func doMetrics(ab []byte, cached bool, r *http.Request, req *pb.Req) {
 	o := &pb.Rsp{}
 	err := json.Unmarshal(ab, o)
 	if err != nil {
-		zj.J(`unmarshal fail`, err)
+		zj.W(`unmarshal fail`, err)
 		util.WriteFile(`metrics-json-fail`, ab)
 		return
 	}
diff --git a/server/src/core/pool.go b/server/src/core/pool.go
index 919ec29..6c3eaa7 100644
--- a/server/src/core/pool.go
+++ b/server/src/core/pool.go
@@ -3,7 +3,6 @@ package core
 import (
 	"net/http"
 	"project/pb"
-	"project/zj"
 	"time"
 )
 
@@ -13,8 +12,8 @@ func (c *Core) add(req *pb.Req, hr *http.Request) (pr *row, cached bool) {
 
 	c.mux.Lock()
 	pr, ok := c.pool[hash]
-	if false && ok {
-		zj.F(`hit %x`, hash)
+	if ok {
+		// zj.F(`hit %x`, hash)
 		c.mux.Unlock()
 		cached = true
 		return
diff --git a/server/src/core/req.go b/server/src/core/req.go
index 7b672b4..57470a4 100644
--- a/server/src/core/req.go
+++ b/server/src/core/req.go
@@ -5,7 +5,6 @@ import (
 	"net/http"
 	"project/pb"
 	"project/util"
-	"project/zj"
 )
 
 func (c *Core) getAB(p *pb.Req, r *http.Request) (ab []byte, cached bool, err error) {
@@ -67,7 +66,7 @@ func req(w http.ResponseWriter, r *http.Request) (p *pb.Req, err error) {
 		ContentType: contentType,
 		Body:        ab,
 	}
-	zj.F(`%x %s %s %s`, p.Hash(), method, url, contentType)
+	// zj.F(`%x %s %s %s`, p.Hash(), method, url, contentType)
 	return
 }
 
diff --git a/server/src/core/web.go b/server/src/core/web.go
index c859c17..403ba30 100644
--- a/server/src/core/web.go
+++ b/server/src/core/web.go
@@ -4,7 +4,6 @@ import (
 	"errors"
 	"net/http"
 	"project/metrics"
-	"project/zj"
 )
 
 var errSkip = errors.New(`skip`)
@@ -31,7 +30,7 @@ func (c *Core) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		err500(w)
 		return
 	}
-	zj.J(`cached`, cached)
+	// zj.J(`cached`, cached)
 
 	w.Header().Add(`Content-Type`, `application/json`)
 	w.Write(ab)