return render_to_response(
    'profile.html',
    {
        'persons':Person.objects.all(),
        'person':Person.objects.get(id=id),
         'request':request,
    },
    context_instance=RequestContext(request)
)

TEMPLATE_CONTEXT_PROCESSORS = (
  # ...
  'django.core.context_processors.request',
  # ...
)

'request':request,