"CSRF verification failed.

About the CSRF_Token

(From Django Official Document)

The CSRF middleware and template tag provides easy-to-use protection against Cross Site Request Forgeries. This type of attack occurs when a malicious website contains a link, a form button or some JavaScript that is intended to perform some action on your website, using the credentials of a logged-in user who visits the malicious site in their browser. A related type of attack, ‘login CSRF’, where an attacking site tricks a user’s browser into logging into a site with someone else’s credentials, is also covered.

The first defense against CSRF attacks is to ensure that GET requests (and other ‘safe’ methods, as defined by RFC 7231#section-4.2.1) are side effect free. Requests via ‘unsafe’ methods, such as POST, PUT, and DELETE, can then be protected by following the steps below.

错误

根据官方文档的说明，我在需要使用POST提交的表单里添加csrf_token即可，然而，还是出现了这个问题，又多看了几遍文档，发现没有错误，然后到谷歌一搜，才发现是模版渲染的问题。
最近看的这本《Django的16堂课》真是害人不浅啊，按照里面的写法问题多多，太坑了。

解决

原本的写法是先用get_template函数获取一个模版对象，然后在render渲染成html，问题就是出在这里，这种方式渲染的html，并不会把加入csrf_token！
使用官方文档里介绍的django.shortcuts.render就没有这个问题。

顺手贴上官方代码

views.py

from django.shortcuts import render
from django.http import HttpResponseRedirect

from .forms import NameForm

def get_name(request):
    # if this is a POST request we need to process the form data
    if request.method == 'POST':
        # create a form instance and populate it with data from the request:
        form = NameForm(request.POST)
        # check whether it's valid:
        if form.is_valid():
            # process the data in form.cleaned_data as required
            # ...
            # redirect to a new URL:
            return HttpResponseRedirect('/thanks/')

    # if a GET (or any other method) we'll create a blank form
    else:
        form = NameForm()

    return render(request, 'name.html', {'form': form})

name.html

<form action="/your-name/" method="post">
    {% csrf_token %}
    {{ form }}
    <input type="submit" value="Submit" />
</form>

再附上官方对于伪造跨站访问请求保护的说明
Forms and Cross Site Request Forgery protection

Django ships with an easy-to-use protection against Cross Site Request Forgeries. When submitting a form via POST with CSRF protection enabled you must use the csrf_token template tag as in the preceding example. However, since CSRF protection is not directly tied to forms in templates, this tag is omitted from the following examples in this document.

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