diff --git a/api/upstream/upstream.go b/api/upstream/upstream.go
index 7f742a9a..e6874213 100644
--- a/api/upstream/upstream.go
+++ b/api/upstream/upstream.go
@@ -1,49 +1,49 @@
 package upstream
 
 import (
-    "github.com/0xJacky/Nginx-UI/internal/logger"
-    "github.com/0xJacky/Nginx-UI/internal/upstream"
-    "github.com/gin-gonic/gin"
-    "github.com/gorilla/websocket"
-    "net/http"
-    "time"
+	"github.com/0xJacky/Nginx-UI/internal/logger"
+	"github.com/0xJacky/Nginx-UI/internal/upstream"
+	"github.com/gin-gonic/gin"
+	"github.com/gorilla/websocket"
+	"net/http"
+	"time"
 )
 
 func AvailabilityTest(c *gin.Context) {
-    var upGrader = websocket.Upgrader{
-        CheckOrigin: func(r *http.Request) bool {
-            return true
-        },
-    }
-    // upgrade http to websocket
-    ws, err := upGrader.Upgrade(c.Writer, c.Request, nil)
-    if err != nil {
-        logger.Error(err)
-        return
-    }
+	var upGrader = websocket.Upgrader{
+		CheckOrigin: func(r *http.Request) bool {
+			return true
+		},
+	}
+	// upgrade http to websocket
+	ws, err := upGrader.Upgrade(c.Writer, c.Request, nil)
+	if err != nil {
+		logger.Error(err)
+		return
+	}
 
-    defer ws.Close()
+	defer ws.Close()
 
-    var body []string
+	var body []string
 
-    err = ws.ReadJSON(&body)
+	err = ws.ReadJSON(&body)
 
-    if err != nil {
-        logger.Error(err)
-        return
-    }
+	if err != nil {
+		logger.Error(err)
+		return
+	}
 
-    for {
-        err = ws.WriteJSON(upstream.AvailabilityTest(body))
+	for {
+		err = ws.WriteJSON(upstream.AvailabilityTest(body))
 
-        if err != nil || websocket.IsUnexpectedCloseError(err,
-            websocket.CloseGoingAway,
-            websocket.CloseNoStatusReceived,
-            websocket.CloseNormalClosure) {
-            logger.Error(err)
-            break
-        }
+		if err != nil || websocket.IsUnexpectedCloseError(err,
+			websocket.CloseGoingAway,
+			websocket.CloseNoStatusReceived,
+			websocket.CloseNormalClosure) {
+			logger.Error(err)
+			break
+		}
 
-        time.Sleep(10 * time.Second)
-    }
+		time.Sleep(10 * time.Second)
+	}
 }