Works fine for me in 2.6 but fails as said by OP on 2.5.
(I came across this in the course of my work and am submitting a change
in a bug for the first time, pardon me if something is inappropriate :)

I used this modified codeblock:

----------
import cookielib
import urllib2

cookiejar = cookielib.LWPCookieJar()
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookiejar))
url = 'https://www.orange.sk/'
req = urllib2.Request(url, None)
s=opener.open(req)
print s.read();

-------------------

2.6 gives a complete HTML page but 2.5 raises httplib.BadStatusLine
exception.