Modifying uri

[Dennis J.]

Hi,
I'm trying to find a way to change the case of a part of the uri like this:

"/TeSt/File.txt" => "/test/File.txt"

i.e. I want to change the first path component of the uri to lower case.
My question is how this can be achieved in a module? I cannot find the 
proper place where to modify the uri and then simply let nginx deliver the 
file at that location. I also tried looking at the rewrite module but could 
not see where it actually modifies the request structure to store the new 
location after a rewrite has happened. Can anyone point me in the right 
direction?

Regards,
   Dennis