diff --git a/routes/api/task.ts b/routes/api/task.ts
index 22a6b3e..95b5b7c 100644
--- a/routes/api/task.ts
+++ b/routes/api/task.ts
@@ -45,11 +45,16 @@ export const handler: Handlers = {
                 socket.send(JSON.stringify(mes));
             }
         }
+        const interval = setInterval(() => {
+            sendMessage({ type: "ping" });
+        }, 30000);
         socket.onclose = () => {
             removeListener();
+            clearInterval(interval);
         };
         socket.onerror = () => {
             removeListener();
+            clearInterval(interval);
             console.error("WebSocket error.");
         };
         socket.onmessage = (e) => {
@@ -70,6 +75,8 @@ export const handler: Handlers = {
                             running: t.get_running_task(),
                         });
                     });
+                } else if (d.type == "ping") {
+                    sendMessage({ type: "pong" });
                 }
             } catch (_) {
                 null;
@@ -144,7 +151,7 @@ export const handler: Handlers = {
                 }
             }
             try {
-                const task = t.add_export_zip_task(gid, dcfg);
+                const task = await t.add_export_zip_task(gid, dcfg);
                 return return_data(task, 201);
             } catch (e) {
                 return return_error(500, e.message);
diff --git a/server/task.ts b/server/task.ts
index 3ce323d..52262e3 100644
--- a/server/task.ts
+++ b/server/task.ts
@@ -4,17 +4,27 @@ import type { DownloadConfig } from "../tasks/download.ts";
 import type { ExportZipConfig } from "../tasks/export_zip.ts";
 import type { DiscriminatedUnion } from "../utils.ts";
 
-export type TaskServerSocketData = TaskEventData | { type: "close" } | {
-    type: "tasks";
-    tasks: Task[];
-    running: number[];
-};
+export type TaskServerSocketData =
+    | TaskEventData
+    | { type: "close" }
+    | {
+        type: "tasks";
+        tasks: Task[];
+        running: number[];
+    }
+    | { type: "ping" }
+    | { type: "pong" };
 
 type EventMap = {
     new_download_task: { gid: number; token: string; cfg?: DownloadConfig };
     new_export_zip_task: { gid: number; cfg?: ExportZipConfig };
 };
 
-export type TaskClientSocketData = DiscriminatedUnion<"type", EventMap> | {
-    type: "close";
-} | { type: "task_list" };
+export type TaskClientSocketData =
+    | DiscriminatedUnion<"type", EventMap>
+    | {
+        type: "close";
+    }
+    | { type: "task_list" }
+    | { type: "ping" }
+    | { type: "pong" };