I'm using Nginx 1.5.1 which is compiled via centminmod, my problem is, whenever I tried to add_header like
add_header Strict-Transport-Security "max-age=360000; includeSubdomains"; this header does not appear to work at all.

I have tried it on 1.4.1 as well, and the results is same, the header does not appear to be functional.

This is my configuration files..
http://pastebin.com/4CCMf4Vz

I also have move the header to the location / { but the results is still not appeared.

There is no error what so ever.

Any help would be appreciated.
Thanks.