code: def set_country(request):
      
      if request.method == 'POST':
          next = request.POST.get('next', request.GET.get('next'))
          if is_safe_url(url=next, host=request.get_host()):
              response = http.HttpResponseRedirect(next)
          else:
              response = http.HttpResponse()
  
          country_code = request.POST.get('country', '').upper()
          if country_code != geo.get_supported_country(country_code):
              return http.HttpResponseBadRequest()
  
          if hasattr(request, 'session'):
              request.session[geo.COUNTRY_SESSION_KEY] = country_code
          else:
              response.set_cookie(geo.COUNTRY_COOKIE_NAME,
                                 country_code,
                                 max_age=geo.COUNTRY_COOKIE_AGE,
                                 path=geo.COUNTRY_COOKIE_PATH)
          return response
      else:
          return http.HttpResponseNotAllowed(['POST'])
docs: Sets the chosen country in the session or cookie.
  
      If `next' query param is present, it redirects to a given url.