diff --git a/misc/test/curl.sh b/misc/test/curl.sh
index 22cfa81..e00549c 100755
--- a/misc/test/curl.sh
+++ b/misc/test/curl.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-curl http://localhost:21035/v1/engines/text-embedding-ada-002/embeddings \
+curl http://localhost:22035/v1/engines/text-embedding-ada-002/embeddings \
   -H "Content-Type: application/json" \
   -H "Authorization: Bearer $OPENAI_API_KEY" \
-  -d '{"input": ["\u80fd\u91cf\u793c\u7269\u662f\u600e\u4e48\u56de\u4e8b\uff1f\u7528\u4e2d\u6587"], "encoding_format": "base64"}'
+  -d '{"input":["\u80fd\u91cf\u793c\u7269\u662f\u600e\u4e48\u56de\u4e8b\uff1f\u7528\u4e2d\u6587"], "encoding_format": "base64"}'
diff --git a/server/src/config/config.go b/server/src/config/config.go
index d38da25..3a2ff67 100644
--- a/server/src/config/config.go
+++ b/server/src/config/config.go
@@ -10,7 +10,7 @@ var (
 
 	WebAddr = `localhost:22035`
 
-	RemoteAPI = `https://api.openai.com`
+	OpenAIBase = `https://api.openai.com`
 
 	OpenAIKey = ``
 )
diff --git a/server/src/config/init.go b/server/src/config/init.go
index f70df87..94e6ec7 100644
--- a/server/src/config/init.go
+++ b/server/src/config/init.go
@@ -1,6 +1,8 @@
 package config
 
 import (
+	"fmt"
+	"net/url"
 	"os"
 	"path/filepath"
 )
@@ -22,4 +24,10 @@ func init() {
 			*v = s
 		}
 	}
+
+	_, err := url.Parse(OpenAIBase)
+	if err != nil {
+		fmt.Println(`OpenAI base URL is invalid.`)
+		panic(err)
+	}
 }
diff --git a/server/src/core/fetch.go b/server/src/core/fetch.go
index f3bd03c..2d6ba85 100644
--- a/server/src/core/fetch.go
+++ b/server/src/core/fetch.go
@@ -2,22 +2,22 @@ package core
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"net/http"
 	"net/url"
 	"project/config"
-	"project/pb"
-	"project/zj"
+	"project/util"
 	"time"
 )
 
-func fetchRemote(r *pb.Req) (ab []byte, err error) {
+func (pr *row) fetchRemote() (ab []byte, ok bool, err error) {
 
-	u, err := url.Parse(config.RemoteAPI)
-	if err != nil {
-		zj.W(`url fail`, config.RemoteAPI, err)
-		return
-	}
+	r := pr.req
+	var b bytes.Buffer
+	pr.failLog = &b
+
+	u, _ := url.Parse(config.OpenAIBase)
 	u.Path = r.Path
 
 	req, err := http.NewRequest(r.Method, u.String(), bytes.NewReader(r.Body))
@@ -25,6 +25,17 @@ func fetchRemote(r *pb.Req) (ab []byte, err error) {
 		return
 	}
 
+	b.WriteString(pr.hr.URL.String())
+	b.WriteString("\n\nreq header:\n\n")
+	for k, v := range pr.hr.Header {
+		fmt.Fprintf(&b, "\t%s: %v\n", k, v)
+	}
+	b.WriteString("\n")
+	fmt.Fprintf(&b, "req body: %d\n\n", len(r.Body))
+	if len(r.Body) > 0 {
+		fmt.Fprintf(&b, "%s\n\n", r.Body)
+	}
+
 	req.Header.Set(`Content-Type`, `application/json`)
 	req.Header.Set(`Authorization`, `Bearer `+config.OpenAIKey)
 
@@ -33,14 +44,35 @@ func fetchRemote(r *pb.Req) (ab []byte, err error) {
 	}
 	rsp, err := client.Do(req)
 	if err != nil {
+		fmt.Fprintf(&b, "client.Do fail: %s\n", err.Error())
 		return
 	}
 
-	for k, v := range rsp.Header {
-		zj.J(k, v)
+	if rsp.StatusCode >= 200 || rsp.StatusCode < 300 {
+		// ok = true
+	} else {
+		err = fmt.Errorf(`status code fail: %d`, rsp.StatusCode)
+		b.WriteString(err.Error())
 	}
 
+	b.WriteString("req header:\n\n")
+	for k, v := range rsp.Header {
+		fmt.Fprintf(&b, "\t%s: %v\n", k, v)
+	}
+	b.WriteString("\n")
+
 	ab, err = io.ReadAll(rsp.Body)
+	if err != nil {
+		fmt.Fprintf(&b, "rsp body: %d %v\n\n", len(ab), err)
+		b.Write(ab)
+	}
+
 	rsp.Body.Close()
 	return
 }
+
+func writeFailLog(hash [16]byte, ab []byte) {
+	date := time.Now().Format(`0102-150405`)
+	file := fmt.Sprintf(`fail/%s-%x.txt`, date, hash)
+	util.WriteFile(file, ab)
+}
diff --git a/server/src/core/row.go b/server/src/core/row.go
index 2283cc2..a804313 100644
--- a/server/src/core/row.go
+++ b/server/src/core/row.go
@@ -1,6 +1,7 @@
 package core
 
 import (
+	"bytes"
 	"fmt"
 	"net/http"
 	"project/pb"
@@ -11,14 +12,15 @@ import (
 )
 
 type row struct {
-	hash [16]byte
-	hr   *http.Request
-	req  *pb.Req
-	rsp  []byte
-	err  error
-	done bool
-	t    time.Time
-	mux  sync.RWMutex
+	hash    [16]byte
+	hr      *http.Request
+	req     *pb.Req
+	rsp     []byte
+	err     error
+	done    bool
+	t       time.Time
+	mux     sync.RWMutex
+	failLog *bytes.Buffer
 }
 
 func (pr *row) run() {
@@ -28,10 +30,16 @@ func (pr *row) run() {
 	s := fmt.Sprintf(`%x, %s`, pr.hash, pr.t.Format(`2006-01-02 15:04:05`))
 	zj.J(`new`, s)
 
-	pr.rsp, pr.err = fetchRemote(pr.req)
+	var ok bool
+	pr.rsp, ok, pr.err = pr.fetchRemote()
+	if pr.err == nil && ok {
+		pr.failLog.Reset()
+	} else {
+		go writeFailLog(pr.hash, pr.failLog.Bytes())
+	}
 
 	go pr.saveFile()
-	go pr.metrics()
+	// go pr.metrics()
 
 	pr.done = true
 	pr.mux.Unlock()
@@ -48,6 +56,3 @@ func (pr *row) saveFile() {
 	rspFile := rspCacheFile(pr.req)
 	util.WriteFile(rspFile, pr.rsp)
 }
-
-func (pr *row) metrics() {
-}
diff --git a/server/src/project.go b/server/src/project.go
index d98d091..cc8f201 100644
--- a/server/src/project.go
+++ b/server/src/project.go
@@ -3,6 +3,7 @@ package project
 import (
 	"project/build"
 	"project/config"
+	"project/tmptest"
 	"project/web"
 	"project/zj"
 
@@ -16,6 +17,8 @@ func Start() {
 
 	zj.Init()
 
+	tmptest.Test()
+
 	go web.Server()
 
 	life.Wait()
diff --git a/server/src/tmptest/t.go b/server/src/tmptest/t.go
new file mode 100644
index 0000000..2b772aa
--- /dev/null
+++ b/server/src/tmptest/t.go
@@ -0,0 +1,35 @@
+package tmptest
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"project/zj"
+)
+
+// Test ...
+func Test() {
+	fetch()
+}
+
+func fetch() {
+
+	client := &http.Client{}
+	req, err := http.NewRequest("GET", "http://10.0.84.49/e500", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer resp.Body.Close()
+	bodyText, err := io.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatal(err)
+	}
+	zj.J(`StatusCode`, resp.StatusCode)
+	fmt.Printf("%s\n", bodyText)
+
+}