diff --git a/index.js b/index.js
index 319b544..3544c98 100644
--- a/index.js
+++ b/index.js
@@ -199,7 +199,14 @@ const fetchAndServe = (data, tempCacheContentFile, cacheContentFile, res) => {
         const cacheStream = fs.createWriteStream(tempCacheContentFile, { flags: 'w' });
 
         let isVideo = data.path && typeof data.path === 'string' && data.path.includes('.mp4');
-        data.headers['content-length'] = realRes.headers['content-length'];
+
+        // 确保 content-length 是有效的
+        const contentLength = realRes.headers['content-length'];
+        if (contentLength) {
+            data.headers['content-length'] = contentLength;
+        } else {
+            console.warn('Warning: content-length is undefined for the response from:', data.realUrl);
+        }
 
         const defaultHeaders = {
             'Cloud-Type': data.cloudtype,
@@ -248,7 +255,13 @@ const serveFromCache = (cacheMetaFile, cacheContentFile, res) => {
     const readStream = fs.createReadStream(cacheContentFile);
 
     let isVideo = cacheData.path && typeof cacheData.path === 'string' && cacheData.path.includes('.mp4');
-    cacheData.headers['content-length'] = fs.statSync(cacheContentFile).size;
+
+    const contentLength = fs.statSync(cacheContentFile).size;
+    if (contentLength) {
+        cacheData.headers['content-length'] = contentLength;
+    } else {
+        console.warn('Warning: content-length is undefined for cached content file:', cacheContentFile);
+    }
 
     readStream.on('open', () => {
 
@@ -310,4 +323,4 @@ process.on('SIGINT', () => {
         console.error('Forcing shutdown...');
         process.exit(1);
     }, 10000);
-});
+});
\ No newline at end of file