Java Servlet MIME类型和Internet Explorer MIME类型处理错误

我有一个servlet,可以返回文本/html或应用程序/pdf内容。显然,Internet Explorer(IE7)似乎无法正确处理应用程序/pdf。

http://web/Servlet

Expires=0
Cache-Control=max-age=1, must-revalidate, no-cache, post-check=0, pre-check=0
Pragma=public
Content-Disposition=inline; filename=filename_1257804404940.pdf
Content-Length=457834
Connection=Keep-Alive
Content-Type=application/pdf
Content-Language=en-US

以上是firefox的输出。在IE下,我可能会得到:

Content-Length=0
Connection=Keep-Alive
Content-Type=text/html
Content-Language=en-US