authenticate and login can not write cookie 'sessionid'

[mrgaolei]

If I use 'django.contrib.auth.urls' login, everything are OK, cookie 'sessionid' writes to Browser.

But, when I login Manually, like:

from django.contrib.auth import authenticate, login, logout
def some_view(request):
    user = authenticate(username="mrgaolei", password="123456")
    if user is not None:
        login(request, user)

No any exceptions, but user not loginged, and no cookie 'sessionid' writes to Browser.
My settings.py is generated by manage.py startproject.

I tried capture login status like:

from django.contrib.auth import authenticate, login, logout
def some_view(request):
    print request.user.is_authenticated()
    user = authenticate(username="mrgaolei", password="123456")
    if user is not None:
        login(request, user)
        print request.user.is_authenticated()

When I refresh this url, terminal output:

False
True

It seems the 'login' method writes the 'sessionid` cookie expire only 1 second.
Is this a bug? Or my fault?

[mrgaolei]

Is my fault!
I don't return any HttpResponse, so the status of HTTP is not 2xx or 3xx, so any session operation are rollback.