redirecting to home page instead of given route

I'm new to django.
I'm trying to save bookmark collected from form . But it is not getting saved in DB and also it is redirecting to home page



def bookmark_save_page(request):
    if request.method == 'POST':
        form = BookmarkSaveForm(request.POST)
        if form.is_valid():
            # Create or get link.
            link, dummy = Link.objects.get_or_create(
            url=form.cleaned_data['url']
            )
            # Create or get bookmark.
            bookmark, created = Bookmark.objects.get_or_create(
            user=request.user,
            link=link
            )
            # Update bookmark title.
            bookmark.title = form.cleaned_data['title']
            # If the bookmark is being updated, clear old tag list.
            if not created:
                bookmark.tag_set.clear()
            # Create new tag list.
            tag_names = form.cleaned_data['tags'].split()
            for tag_name in tag_names:
                tag, dummy = Tag.objects.get_or_create(name=tag_name)
                bookmark.tag_set.add(tag)
            # Save bookmark to database.
            bookmark.save()
            return HttpResponseRedirect(
                '/user/%s/' % request.user.username
                 )
    else:
        form = BookmarkSaveForm()
    variables = RequestContext(request, {
            'form': form
            })
    return render_to_response('bookmark_save.html', variables)



URL's:


urlpatterns = [
    # Examples:
    # url(r'^$', 'mysite.views.home', name='home'),
    # url(r'^blog/', include('blog.urls')),

    url(r'^admin/', include(admin.site.urls)),
    url(r'^$', main_page),
    url(r'^sec/$', secondary_page),
    url(r'^user/(\w+)/$', user_page),
    url(r'^login/$', 'django.contrib.auth.views.login'),
    url(r'^logout/$', logout_page),
    url(r'^register/$', register_page),
    url(r'^register/success/$', TemplateView.as_view(template_name="registration/register_success.html")),
    url(r'^save/$', bookmark_save_page),
]


models:

class Link(models.Model):
    url = models.URLField(unique=True)
    def __unicode__(self):
        return self.url
   
class Bookmark(models.Model):
    title = models.CharField(max_length=200)
    user = models.ForeignKey(User)
    link = models.ForeignKey(Link)
    def __unicode__(self):
        return '%s , %s ' %(self.user.username, self.link.url)
   
class Tag(models.Model):
    name = models.CharField(max_length=64, unique = True)
    bookmarks = models.ManyToManyField(Bookmark)
    def __unicode__(self):
        return self.name

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