diff --git a/addition/web/duckduckgo.go b/addition/web/duckduckgo.go
index 187cf3d..dfad6b6 100644
--- a/addition/web/duckduckgo.go
+++ b/addition/web/duckduckgo.go
@@ -29,7 +29,7 @@ func formatResponse(data *DDGResponse) string {
 	return strings.Join(res, "\n")
 }
 
-func CallDuckDuckGoAPI(query string) *DDGResponse {
+func CallDuckDuckGoAPI(query string) (*DDGResponse, error) {
 	data, err := utils.Get(fmt.Sprintf(
 		"%s/search?q=%s&max_results=%d",
 		channel.SystemInstance.GetSearchEndpoint(),
@@ -38,8 +38,8 @@ func CallDuckDuckGoAPI(query string) *DDGResponse {
 	), nil)
 
 	if err != nil {
-		return nil
+		return nil, err
 	}
 
-	return utils.MapToStruct[DDGResponse](data)
+	return utils.MapToRawStruct[DDGResponse](data)
 }
diff --git a/addition/web/search.go b/addition/web/search.go
index 7e6ad20..556ec0f 100644
--- a/addition/web/search.go
+++ b/addition/web/search.go
@@ -1,7 +1,9 @@
 package web
 
 import (
+	"chat/globals"
 	"chat/utils"
+	"fmt"
 	"net/url"
 )
 
@@ -22,13 +24,8 @@ func RequestWithUA(url string) string {
 	return data
 }
 
-func SearchWebResult(q string) string {
-	if res := CallDuckDuckGoAPI(q); res != nil {
-		if resp := formatResponse(res); resp != "" {
-			return resp
-		}
-	}
-
+func SearchReverse(q string) string {
+	// deprecated
 	uri := GetBingUrl(q)
 	if res := CallPilotAPI(uri); res != nil {
 		return utils.Marshal(res.Results)
@@ -36,3 +33,15 @@ func SearchWebResult(q string) string {
 	data := RequestWithUA(uri)
 	return ParseBing(data)
 }
+
+func SearchWebResult(q string) string {
+	res, err := CallDuckDuckGoAPI(q)
+	if err != nil {
+		globals.Warn(fmt.Sprintf("[web] failed to get search result: %s (query: %s)", err.Error(), q))
+		return ""
+	}
+
+	content := formatResponse(res)
+	globals.Debug(fmt.Sprintf("[web] search result: %s (query: %s)", utils.Extract(content, 50, "..."), q))
+	return content
+}
diff --git a/app/src/components/admin/RedeemTable.tsx b/app/src/components/admin/RedeemTable.tsx
index 6fb7c7e..6c668fa 100644
--- a/app/src/components/admin/RedeemTable.tsx
+++ b/app/src/components/admin/RedeemTable.tsx
@@ -27,7 +27,7 @@ import { Textarea } from "@/components/ui/textarea.tsx";
 import { saveAsFile } from "@/utils/dom.ts";
 import { useEffectAsync } from "@/utils/hook.ts";
 
-function GenerateDialog() {
+function GenerateDialog({ sync }: { sync: () => void }) {
   const { t } = useTranslation();
   const { toast } = useToast();
   const [open, setOpen] = useState<boolean>(false);
@@ -41,12 +41,15 @@ function GenerateDialog() {
 
   async function generateCode() {
     const data = await generateRedeem(Number(quota), Number(number));
-    if (data.status) setData(data.data.join("\n"));
-    else
+    if (data.status) {
+      setData(data.data.join("\n"));
+      sync();
+    } else {
       toast({
         title: t("admin.error"),
         description: data.message,
       });
+    }
   }
 
   function close() {
@@ -174,7 +177,7 @@ function RedeemTable() {
         <Button variant={`outline`} size={`icon`} onClick={sync}>
           <RotateCw className={`h-4 w-4`} />
         </Button>
-        <GenerateDialog />
+        <GenerateDialog sync={sync} />
       </div>
     </div>
   );
diff --git a/channel/system.go b/channel/system.go
index 69b4ba2..f548b17 100644
--- a/channel/system.go
+++ b/channel/system.go
@@ -142,7 +142,7 @@ func (c *SystemConfig) GetInitialQuota() float64 {
 }
 
 func (c *SystemConfig) GetBackend() string {
-	return c.General.Backend
+	return strings.TrimSuffix(c.General.Backend, "/")
 }
 
 func (c *SystemConfig) GetMail() *utils.SmtpPoster {
@@ -209,10 +209,10 @@ func (c *SystemConfig) GetSearchEndpoint() string {
 	}
 
 	endpoint := c.Search.Endpoint
-	if strings.HasSuffix(endpoint, "/") {
-		return endpoint[:len(endpoint)-1]
-	} else if !strings.HasSuffix(endpoint, "/search") {
+	if strings.HasSuffix(endpoint, "/search") {
 		return endpoint[:len(endpoint)-7]
+	} else if strings.HasSuffix(endpoint, "/") {
+		return endpoint[:len(endpoint)-1]
 	}
 
 	return endpoint
diff --git a/utils/char.go b/utils/char.go
index 2d1b100..815b2e4 100644
--- a/utils/char.go
+++ b/utils/char.go
@@ -169,7 +169,12 @@ func SplitLangItems(data string) []string {
 	return SplitItems(data, []string{",", "，", " ", "\n"})
 }
 
-func Extract(data string, length int, flow string) string {
+func Extract(data string, length int, flow_ ...string) string {
+	flow := ""
+	if len(flow_) > 0 {
+		flow = flow_[0]
+	}
+
 	value := []rune(data)
 	if len(value) > length {
 		return string(value[:length]) + flow