[web2py] redirection to /default/user/profile

[pk]

hi together,

i have a problem with a redirection. i will not redirected to this
link!
in my view i have this: <li class="blue"><a href="{{=URL(r=request,
c='default', f='user/logout')}}"><span>logout</span></a></li>

my main-controller:
@auth.requires_login()
def index():
    return dict(message="main/index")

default-controller:
def index():
    if auth.is_logged_in():
        redirect(URL(r=request, c='main', f='index'))
    return dict(message="index")

def user():
    loginform=auth.login()
    registerform=auth.register()
    return dict(loginform=loginform, registerform=registerform)

but always after clicking the link i get this redirection!
hope somebody of you can help me?!?

thanks peter