difficulty adding headers

[ura]

i just did a test of inserting a meaningless header into the response, by
adding the add_header directive into the various levels of the nginx config,
beginning with http, then server and then the location that i have setup to
focus on mp4 files.

i found that the header is successfully inserted inside the http and server
blocks, yet when i request an mp4 file via curl, the header is not
returned.. which suggests to me that the location block i am using is
dysfunctional in some way.

currently i am using the block below, though i have used various other
versions which also failed.

location ~ \.(mp4|mp4a)$ 
{
	add_header "name" "value";
}

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,251236,251257#msg-251257