http和https协议下，http可以正常下载，但是https却不能

问题描述，在http协议下，文件是可以正常下载的，但是在https协议下，下载文件会获取不到文件。

      核心代码如下：（主要是response.addHeader("Pramgma","public")和response.addHeader("Cache-Control","max-age=0")），因为，浏览器通过HTTPS下载时，默认其cache缓存是不给权限的，所以，必须先要对cache进行配置，并给与其相应权限。

	public static String downloadFile(HttpServletResponse response, String fileName, boolean notIE) {
		InputStream stream = FileUtil.class.getClassLoader().getResourceAsStream("static/doc/" + fileName);
		response.setHeader("content-type", "application/octet-stream");
		response.addHeader("Pragma", "public");
		response.addHeader("Cache-Control", "max-age=0"); 
		response.setContentType("application/octet-stream");
		try {
			String name = java.net.URLEncoder.encode(fileName, "UTF-8");
			if (notIE) {
				name = java.net.URLDecoder.decode(name, "ISO-8859-1");
			}
			response.setHeader("Content-Disposition", "attachment;filename=" + name);
		} catch (UnsupportedEncodingException e2) {
			e2.printStackTrace();
		}
		byte[] buff = new byte[1024];
		BufferedInputStream bis = null;
		OutputStream os = null;
		try {
			os = response.getOutputStream();
			bis = new BufferedInputStream(stream);
			int i = bis.read(buff);
			while (i != -1) {
				os.write(buff, 0, buff.length);
				os.flush();
				i = bis.read(buff);
			}
		} catch (FileNotFoundException e1) {
			// e1.getMessage()+"系统找不到指定的文件";
			return "系统找不到指定的文件";
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (bis != null) {
				try {
					bis.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return "success";
	}