Modifying or adding cookies via nginx.conf

Hi,

I’m dealing with the issue of modifying or adding a cookie on the fly
via nginx.conf

I look through all the doc and did not find anything except about
identification (http://wiki.codemongers.com/NginxHttpUserIdModule) and
from an external module i forgot about the name (allowing to access
cookies individually but not to set them for the moment).

So, as i want a cookie value to depend on the URL, i’m looking at all
the options and i just want to know if it’s possible and where to look
for in that case.

Thx guys.