IE 无法通过 WebSphere 提供的 SSL 下载文件

Question

当用户尝试通过 https 下载 csv 文件时，IE 7 和 8 都会引发错误。

Internet Explorer 无法下载 downloadPage.jsf。 Internet Explorer 无法打开此 Internet 站点。请求的站点不可用或找不到。请重试

我阅读了 IE 与缓存相关的问题，因此我更改了响应以允许公共缓存。看到这个问题：IE cannot download foo.jsf. IE was not able to open this internet site. The requested site is either unavailable or cannot be found

response.setHeader("Pragma", "public");
response.setHeader("Cache-Control", "public");

但我仍然收到此错误。

您知道还有什么可能导致该问题吗？这是完整的 sn-p：

HttpServletResponse response = (HttpServletResponse) context.getExternalContext().getResponse();
response.setContentType("text/plain");
response.setHeader("Content-Disposition", "attachment; filename=\"" + browserFilename + "\"");
response.setHeader("Pragma", "public");
response.setHeader("Cache-Control", "public");
response.getOutputStream().write(contentBytes);
context.responseComplete();

Answer 1

当响应中包含 cookie 时，WebSphere 似乎会自动添加 Cache-Control:no-cache=set-cookie 响应标头。通过 SSL 下载时，IE8 及更早版本不喜欢这样。

根据IBM Developerworks forum thread，有两个可能的修复：

1. 为WebSphere中的HTTP传输通道添加自定义响应头CookiesConfigureNoCache:false（默认为true）。

   response.setHeader("CookiesConfigureNoCache", "false");             
   

2. 在添加 cookie 之后显式设置 Cache-Control 标头，这将覆盖 WebSphere 设置的。

   response.addCookie(...);
   response.addCookie(...);
   ...
   response.setHeader("Cache-Control", ...);
   

Answer 2

我在 IE8 上遇到了同样的问题。 我对我的代码做了一些小改动。

Response.ClearHeaders(); //需要，否则“no-cache: set-cookie”在那里，必须摆脱它

Response.addHeader("Cache-Control", "private");

Answer 3

将应用服务器配置为使用 SSL 时遇到完全相同的问题。打开 https 后我让它工作的技巧：

   string attachment = "attachment; filename=" + rptName + ".xls" + "";    

    HttpContext.Current.Response.Clear();
    HttpContext.Current.Response.ClearHeaders();
    HttpContext.Current.Response.AddHeader("content-disposition", attachment);
    HttpContext.Current.Response.AddHeader("Cache-Control", "private, max-age=1");

    HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";

    HttpContext.Current.Response.Charset = "";
    HttpContext.Current.Response.Buffer = true;
    HttpContext.Current.Response.Cache.SetExpires(DateTime.Now.AddMinutes(1));

Answer 4

我认为你在缓存方面是正确的：

这篇知识库文章可能会对您有所帮助， Internet Explorer is unable to open Office documents from an SSL Web site

在这个 Stack Overflow 问题中提到：Cannot open xls file in IE

Answer 5

我也遇到过同样的问题。 设置“Content-Disposition”和“Content-Type”后，添加此代码。

Java 代码

// IE requires these three lines, exactly like this
response.setHeader("CookiesConfigureNoCache", "false");             
response.setHeader("Pragma","private,no-cache");     
response.setHeader("Cache-control","private,no-store,no-cache,max-age=0,must-revalidate");

PHP 代码

// IE requires these three lines, exactly like this
header("CookiesConfigureNoCache: false");
header("Pragma: private,no-cache");
header("Cache-control: private,no-store,no-cache,max-age=0,must-revalidate");

Answer 6

这是我在 PHP 代码中所做的：

header( "HTTP/1.0 200 OK" );
header( "Content-Disposition: inline; filename=$path" );
header( "Content-Type: attachment; application/pdf" );
header( "Content-Length: $info[7]" );
header( "Cache-Control: no-store, no-cache" );          // IE 8 requires these two lines, exactly like this
header( "Pragma: private" );                            // IE 8 requires these two lines, exactly like this
readfile( $tmpfile );