Sorry. I have a misunderstand of your mail. And here is some suggestions
for
you.
If your only have fewer static file type, add default_type at your
special
location context. In addition if your static file is for download, then
I
think the simple way is to add force download header at the conf file.
Other
else I think you should add this header in your code.
If you want nginx add Content-Type header in X-Accel-Redirect, she must
recognize the file type, and I think that’s not efficient.