Does DNN have this setting? Because my manager believes DNN can configurate these, I just try to ask in here.

One of my server has Content-Encoding:gzip, and IE can't open PDF on that machine, it always propmts to download an ASPX file, which I am using to write PDF stream. The stream is correct, if I save that ASPX to local machine and change the extension name, it's a PDF.

I am think is it possible PDF in the compression list so that IE doesn't understand the content-type of a compressed PDF stream. 'cause FireFox does open that! 

I have another machine working properly, the only difference is the following three content header

Content-Encoding :gzip

Vary: Accept-Encoding

Transfer-Encoding: chunked

Do they matter in this case?

Thank you very much!