diff --git a/functions/file/[[path]].js b/functions/file/[[path]].js
index da2fe8aa..d350d67a 100644
--- a/functions/file/[[path]].js
+++ b/functions/file/[[path]].js
@@ -175,7 +175,9 @@ async function handleTelegramChunkedFile(context, imgRecord, encodedFileName, fi
     const headers = new Headers();
     setCommonHeaders(headers, encodedFileName, fileType, Referer, url);
     headers.set('Content-Length', totalSize.toString());
-    
+
+    headers.append('Vary', 'Range');
+
     // 添加ETag支持
     const etag = `"${metadata.TimeStamp || Date.now()}-${totalSize}"`;
     headers.set('ETag', etag);
@@ -268,20 +270,27 @@ async function handleTelegramChunkedFile(context, imgRecord, encodedFileName, fi
             }
         });
         
-        // 设置Range相关头部
-        if (isRangeRequest) {
-            setRangeHeaders(headers, rangeStart, rangeEnd, totalSize);
-            
-            return new Response(stream, {
-                status: 206, // Partial Content
-                headers,
-            });
-        } else {
-            return new Response(stream, {
-                status: 200,
-                headers,
-            });
-        }
+// 设置Range相关头部
+if (isRangeRequest) {
+setRangeHeaders(headers, rangeStart, rangeEnd, totalSize);
+
+    // 明确告诉浏览器/CF：支持分段请求
+    headers.set('Accept-Ranges', 'bytes'); 
+
+    return new Response(stream, {
+        status: 206, // Partial Content
+        headers,
+    });
+} else {
+    // 关键：避免首个 200 整段被缓存，导致后续 Range 请求直接命中 200
+    headers.set('Cache-Control', 'no-store');  // 或 'max-age=0, must-revalidate'
+
+    return new Response(stream, {
+        status: 200,
+        headers,
+    });
+}
+
         
     } catch (error) {
         return new Response(`Error: Failed to reconstruct chunked file - ${error.message}`, { status: 500 });
diff --git a/functions/file/fileTools.js b/functions/file/fileTools.js
index 1f8a5ead..52ddff01 100644
--- a/functions/file/fileTools.js
+++ b/functions/file/fileTools.js
@@ -35,6 +35,8 @@ export function setCommonHeaders(headers, encodedFileName, fileType, Referer, ur
     headers.set('Content-Disposition', `inline; filename="${encodedFileName}"; filename*=UTF-8''${encodedFileName}`);
     headers.set('Access-Control-Allow-Origin', '*');
     headers.set('Accept-Ranges', 'bytes');
+
+    headers.append('Vary', 'Range');
     
     if (fileType) {
         headers.set('Content-Type', fileType);
@@ -81,25 +83,57 @@ export async function getFileContent(request, targetUrl, max_retries = 2) {
     let retries = 0;
     while (retries <= max_retries) {
         try {
-            const response = await fetch(targetUrl, {
-                method: request.method,
-                headers: request.headers,
-                body: request.body,
+            // 复制请求头，确保 Range / If-None-Match 等关键头被透传
+            const fwdHeaders = new Headers(request.headers);
+
+            // 显式兜底：有些运行时需要手动 set 一下
+            const range = request.headers.get("Range");
+            if (range) fwdHeaders.set("Range", range);
+
+            // 只允许 GET/HEAD 转发
+            const method = request.method === "HEAD" ? "HEAD" : "GET";
+
+            const upstreamReq = new Request(targetUrl, {
+                method,
+                headers: fwdHeaders,
+                redirect: "follow",
             });
-            if (response.ok || response.status === 304) {
-                return response;
-            } else if (response.status === 404) {
-                return new Response('Error: Image Not Found', { status: 404 });
+
+            const upstreamRes = await fetch(upstreamReq);
+
+            if (upstreamRes.ok || upstreamRes.status === 304) {
+                const headers = new Headers(upstreamRes.headers);
+
+                // 关键：让缓存区分是否带 Range
+                headers.append("Vary", "Range");
+
+                // 如果是 Range 请求但上游仍返回 200，这里兜底改成 206
+                if (range && upstreamRes.status === 200) {
+                    headers.set("Accept-Ranges", "bytes");
+                    return new Response(upstreamRes.body, {
+                        status: 206,
+                        headers,
+                    });
+                }
+
+                return new Response(upstreamRes.body, {
+                    status: upstreamRes.status,
+                    statusText: upstreamRes.statusText,
+                    headers,
+                });
+            } else if (upstreamRes.status === 404) {
+                return new Response("Error: Image Not Found", { status: 404 });
             } else {
                 retries++;
             }
-        } catch (error) {
+        } catch (_err) {
             retries++;
         }
     }
     return null;
 }
 
+
 export function isTgChannel(imgRecord) {
     return imgRecord.metadata?.Channel === 'Telegram' || imgRecord.metadata?.Channel === 'TelegramNew';
 }
@@ -208,4 +242,4 @@ export async function returnWhiteListImg(url) {
             },
         });
     }
-}
\ No newline at end of file
+}