redirect和HttpResponseRedirect重定向问题：

from django.shortcuts import render, redirect
from django.http import HttpResponse, HttpResponseRedirect
from django.core.urlresolvers import reverse
from . import models

def index(request):

    context = models.user.objects.all()
    return render(request, 'mydata/index.html', {'context': context})

def add(request):

    username = request.POST['username']
    pwd = request.POST['pwd']

    models.user.objects.create(username=username, pwd=pwd)

    # return HttpResponseRedirect('/mydata/index/')
    # redirect('mydata:index')

    return HttpResponseRedirect('/mydata/index/')