this is 4.2 update

src/main/java/com/cultural/heritage/controller/file/FileController.java

@@ -176,12 +176,22 @@ public class FileController {
 		filename = "feiyi/fonts/" + filename; // 字体路径
 		String filePath = UPLOAD_DIR + filename;
 		File file = new File(filePath);
-		// 清空response
+//		// 清空response
-		response.reset();
+//		response.reset();
 		// 设置response的Header
 		response.setContentType("application/octet-stream");
-		response.addHeader("Content-Disposition", "inline;filename=" + URLEncoder.encode(file.getName(), StandardCharsets.UTF_8));
+		response.addHeader("Content-Disposition", "attachment;filename=" + file.getName());
-		response.setCharacterEncoding("UTF-8");
+		response.setContentLengthLong(file.length());  // 使用 setContentLengthLong 适应大文件
+
+		// 设置缓存相关的 HTTP 头
+		long lastModified = file.lastModified();
+		response.setDateHeader("Last-Modified", lastModified); // 文件最后修改时间
+		response.setHeader("Cache-Control", "public, max-age=86400");  // 缓存一天（24小时）
+		response.setHeader("ETag", String.valueOf(lastModified)); // 使用文件最后修改时间作为 ETag
+
+
+
+
 		// 使用 BufferedInputStream 和 BufferedOutputStream 提高性能
 		try (BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file), BUFFER_SIZE);
 			 BufferedOutputStream bos = new BufferedOutputStream(response.getOutputStream(), BUFFER_SIZE)) {

src/main/resources/application.yml

@@ -1,6 +1,6 @@
 spring:
   profiles:
-    active: dev
+    active: prod