In configuration file:

```
config.add_route('lang', '/lang-{code}')

```

In views:

```
@view_config(route_name='lang')
def lang(request):
    code = request.matchdict['code']
    response = Response()
    response.set_cookie('lang', value=code, max_age=31536000) # max_age = year

    return HTTPFound(location=request.environ['HTTP_REFERER'])

```

The mechanism is simple: there is a dropped down menu item with languages and clicking on anyone must refresh site with new locale.

Runs without errors, but no cookie set up...
What I did wrong?

Thanks!