[web2py] Trouble using URLs to specify the language

[ender72]

Hi,
I'm reading "web2py application development cookbook",
page 277
"To specify a language for outgoing URLs using URL(), set request.lang to 
one of the supported languages [...]".

Mmm... maybe something's wrong, because if I put this code in a view:

{{
  request.lang='it'
  link_it = URL('about', 'index')
  request.lang='en'
  link_en = URL('about', 'index')
  request.lang='fr'
  link_fr = URL('about', 'index')
}}
{{=link_it}}, {{=link_en}}, {{=link_fr}}

results are:
/en/azienda, /en/azienda, /en/azienda 
(if request.url is http://127.0.0.1:8000/app/en/<controller>/<function>/)
or
/it/azienda, /it/azienda, /it/azienda 
(if request.url is http://127.0.0.1:8000/app/it/<controller>/<function>/)
etc...

my routes.py is

routers = dict(
    BASE = dict(
        default_application='app',
        default_controller = 'home',
        default_function = 'index'
    ),
    casal = dict(
        map_hyphen = True,
        languages = ['it', 'en', 'fr'],
        default_language = 'it',
    ),
)


Thanks.