在 IE 中通过 https 下载文件失败

Question

我正在尝试通过 HTTPS 下载文件它在 IE 中失败，但在 Firefox 和 Firefox 中完美运行。 Chrome：

aspx代码如下：

<%@ Page Language="C#" MasterPageFile="~/MasterPage.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="CRISIIWebApplication1.Default" Title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
  <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
  <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click"  />  
</asp:Content>

点击按钮后的代码如下：

protected void Button1_Click(object sender, EventArgs e)
        {
            string filename = TextBox1.Text;
            string filepath = Server.MapPath(filename);

        byte[] bytFile = null;
        FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.Read);
        BinaryReader br = new BinaryReader(fs);
        long numBytes = new FileInfo(filepath).Length;
        bytFile = br.ReadBytes((int)numBytes);
        string extension = ".xlsx";

        Response.ClearHeaders();
        Response.Clear();
        Response.Buffer = true;

        if (extension == ".doc")
        {
            Response.ContentType = "application/vnd.ms-word";
            Response.AddHeader("content-disposition", "attachment;filename=" + filename);
        }

        else if (extension == ".docx")
        {
            Response.ContentType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
            Response.AddHeader("content-disposition", "attachment;filename=" + filename);
        }

        else if (extension == ".xls" || extension == ".xlsx")
        {
            if (extension == ".xls")
            {
                Response.ContentType = "application/vnd.ms-excel";
                Response.AddHeader("content-disposition", "attachment;filename=" + filename);
            }
            else
            {
                Response.ContentType = "application/ms-excel";
                //Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                Response.AddHeader("content-disposition", "attachment;filename=" + filename);
            }
        }
        else if (extension == ".pdf")
        {
            Response.ContentType = "application/pdf";
            Response.AddHeader("content-disposition", "attachment;filename=" + filename);
        }

        Response.Charset = "";
        Response.Cache.SetCacheability(HttpCacheability.NoCache);

        Response.BinaryWrite(bytFile);
        HttpContext.Current.ApplicationInstance.CompleteRequest();
        Response.End();
    }

请帮忙

Answer 1

正如用户 SquidScareMe 所写，通过 SSL 下载 Office 文件时，您必须忽略/不要触及 Office 文件的缓存设置。

我有一个 .ashx 处理程序，其中有一个片段，例如：

// "Internet Explorer is unable to open Office documents from an SSL Web site".
// http://support.microsoft.com/kb/316431/en-us
if (!context.Request.IsSecureConnection || !isInternetExplorer(context))
{
    // No cache.
    context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
    context.Response.AppendHeader(@"Pragma", @"no-cache");
}

使用此函数：

private static bool isInternetExplorer(HttpContext context)
{
    return context.Request.Browser.Browser == @"IE";
}

Answer 2

http://blogs.msdn.com/b/ieinternals/archive/2009/10/03/internet-explorer-cannot-download-over-https-when-no-cache.aspx

更新：啊哈！
http://www.openrdf.org/issues/browse/SES-63

解决方案：
Internet Explorer->工具菜单->互联网选项->高级选项卡
一直转到底部的安全部分。
取消选中“不将加密页面保存到磁盘”
关闭所有 Internet Explorer 窗口
启动 IE 并再次下载文件

Answer 3

此问题的解决方案是在 ISA 上激活压缩。完成这一步后网站就可以毫无问题地传输文件了！
当您尝试在使用无缓存的情况下通过 HTTPS 传输文件时，会出现此问题。

Answer 4

您可以通过指定 Cache-Control 标头来解决此问题，如下所示：

Response.AddHeader("Cache-Control", "no-store, no-cache");

这样您仍然可以指定缓存设置，它将与 https 一起使用。

请参阅：http://blogs.msdn.com/b/ieinternals/archive/2009/10/03/internet-explorer-cannot-download-over-https-when-no-cache.aspx