diff --git a/index.js b/index.js
index a3c111c..7769b2d 100644
--- a/index.js
+++ b/index.js
@@ -29,20 +29,17 @@ if (!fs.existsSync(cacheDir)) {
     fs.mkdirSync(cacheDir);
 }
 
-
-// 定时清理过期缓存数据并更新请求
-setInterval(async () => {
+// 定时清理过期缓存数据
+setInterval(() => {
     const currentTime = Date.now();
     for (const key in pathIndex) {
-        const { timestamp } = pathIndex[key];
-        // 24小时
-        if (currentTime - timestamp > 24 * 60 * 60 * 1000) {
+        if (currentTime - pathIndex[key].timestamp > 24 * 60 * 60 * 1000) {
             delete pathIndex[key];
         }
     }
-}, 1 * 60 * 60 * 1000); // 每隔 1 小时执行一次
-
+}, 60 * 60 * 1000); // 每隔 1 小时执行一次
 
+// 处理请求并返回数据
 const server = http.createServer(async (req, res) => {
     if (req.url === '/favicon.ico') {
         res.writeHead(204);
@@ -50,6 +47,21 @@ const server = http.createServer(async (req, res) => {
         return;
     }
 
+    // 返回 endpoint, 缓存目录, 缓存数量, 用于监听服务是否正常运行
+    if (req.url === '/endpoint') {
+        res.writeHead(200, { 'Content-Type': 'application/json' });
+        res.end(JSON.stringify({
+            code: 200,
+            data: {
+                api: apiEndpoint,
+                port: port,
+                cacheDir: cacheDir,
+                pathIndexCount: Object.keys(pathIndex).length,
+            }
+        }));
+        return;
+    }
+
     const parsedUrl = url.parse(req.url, true);
     const reqPath = parsedUrl.pathname;
     const sign = parsedUrl.query.sign || '';
@@ -83,7 +95,6 @@ const server = http.createServer(async (req, res) => {
                 // 修改 pathIndex 记录时，添加时间戳
                 pathIndex[uniqidhex] = { uniqid: data.uniqid, timestamp: Date.now() };
 
-
                 cacheMetaFile = pathModule.join(cacheDir, `${data.uniqid}.meta`);
                 cacheContentFile = pathModule.join(cacheDir, `${data.uniqid}.content`);
                 tempCacheContentFile = pathModule.join(cacheDir, `${data.uniqid}_${crypto.randomBytes(16).toString('hex')}.temp`);
@@ -94,20 +105,21 @@ const server = http.createServer(async (req, res) => {
                 // 如果内容缓存存在, 则直接调用
                 if (fs.existsSync(cacheContentFile)) {
                     serveFromCache(cacheMetaFile, cacheContentFile, res);
-                    return;
+                } else {
+                    fetchAndServe(data, tempCacheContentFile, cacheContentFile, res);
                 }
-                fetchAndServe(data, tempCacheContentFile, cacheContentFile, res);
             } else {
                 res.writeHead(502, { 'Content-Type': 'text/plain' });
                 res.end(apiData.message || 'Bad Gateway');
             }
         } catch (error) {
             res.writeHead(502, { 'Content-Type': 'text/plain' });
-            res.end('Bad Gateway: Failed to decode JSON' + error);
+            res.end('Bad Gateway: Failed to decode JSON ' + error);
         }
     }
 });
 
+// 检查缓存是否有效
 const isCacheValid = (cacheMetaFile, cacheContentFile) => {
     if (!fs.existsSync(cacheMetaFile) || !fs.existsSync(cacheContentFile)) return false;
 
@@ -115,6 +127,7 @@ const isCacheValid = (cacheMetaFile, cacheContentFile) => {
     return cacheData.expiration > Date.now();
 };
 
+// 从 API 获取数据
 const fetchApiData = (reqPath, sign) => {
     return new Promise((resolve, reject) => {
         const postData = querystring.stringify({ path: reqPath, sign });
@@ -146,6 +159,7 @@ const fetchApiData = (reqPath, sign) => {
     });
 };
 
+// 从真实 URL 获取数据并写入缓存
 const fetchAndServe = (data, tempCacheContentFile, cacheContentFile, res) => {
     https.get(data.realUrl, { timeout: requestTimeout * 10 }, (realRes) => {
         const cacheStream = fs.createWriteStream(tempCacheContentFile, { flags: 'w' });
@@ -188,6 +202,7 @@ const fetchAndServe = (data, tempCacheContentFile, cacheContentFile, res) => {
     });
 };
 
+// 从缓存中读取数据并返回
 const serveFromCache = (cacheMetaFile, cacheContentFile, res) => {
     const cacheData = JSON.parse(fs.readFileSync(cacheMetaFile, 'utf8'));
     const readStream = fs.createReadStream(cacheContentFile);
@@ -217,6 +232,7 @@ const serveFromCache = (cacheMetaFile, cacheContentFile, res) => {
     });
 };
 
+// 处理响应错误
 const handleResponseError = (res, tempCacheContentFile, realUrl) => {
     if (!res.headersSent) {
         res.writeHead(502, { 'Content-Type': 'text/plain' });
@@ -227,6 +243,7 @@ const handleResponseError = (res, tempCacheContentFile, realUrl) => {
     }
 };
 
+// 处理缓存读取错误
 const handleCacheReadError = (res) => {
     if (!res.headersSent) {
         res.writeHead(500, { 'Content-Type': 'text/plain' });
@@ -234,11 +251,12 @@ const handleCacheReadError = (res) => {
     }
 };
 
+// 启动服务器
 server.listen(port, () => {
     console.log(`Proxy server is running on http://localhost:${port}`);
 });
 
-// Graceful shutdown
+// 处理 SIGINT 信号（Ctrl+C）
 process.on('SIGINT', () => {
     console.log('Received SIGINT. Shutting down gracefully...');
     server.close(() => {