Domain is redirected to www.----, I don't know why, I need to stop it

Hi,

Thank you for any help on this matter.

I've enabled debugging output for the error.log, and here is a snippet: http://pastebin.ca/2662543 (attached here as well)

As is shown there, the address seems ok for a while ("dev2.my_domain.com"), and the first appearance of 'www' when handling the request appears with:

http scgi status 302 "302 Found"
http scgi header: "Status: 302 Found"
http scgi header: "Location: https://www.dev2.my_domain.com/"

Where does that come from? Any suggestions for preventing this?

Thank you again tremendously for any assistance.