python之django_facebook 应用程序中的链接导致错误请求 : missing signed_request

我正在使用安装在 pythonanywhere 上的 django_facebook 库。 当我单击从一个 View 到另一个 View 的链接时，我收到一条错误消息:

400 Bad Request

Missing signed_request.

谁能简要介绍一下链接在 Facebook 应用程序中的工作原理？

删除 @canvas_only 装饰器并不能解决问题，因为我需要访问图形 API。

代码如下:

views.py:

from django.shortcuts import render 
from django_facebook.decorators import canvas_only 
#from django_facebook.decorators import facebook_required 
#from django.utils.decorators import method_decorator 
 
from models import Poem, Share 
from django import forms 
from django.views.generic import View 
 
class PoemEntryForm(forms.Form): 
    words = forms.CharField( widget=forms.widgets.Textarea(), initial='ENTER\nPOEM\nHERE\nONE\nWORD\nPER\nLINE' ) 
 
@canvas_only 
def home(request): 
    me = request.facebook.graph.get_object('me') 
    my_username = me['username'] 
    request.session['username'] = my_username 
 
    try: 
        poems = Poem.objects.filter(user=my_username) 
    except Poem.DoesNotExist: 
        poems = [] 
 
    # convert poems into tuples of information relevant to the home page 
    # sort them in reverse chronological order 
    # ie: title and created 
    poems = [(poem.title(), poem.created) for poem in sorted(poems, key=lambda poem: poem.created, reverse=True)] 
 
    try: 
        shared = Share.objects.filter(shared_to=my_username) 
    except Share.DoesNotExist: 
        shared = [] 
 
    shared = [(poem.title(), poem.user, poem.created) for poem in sorted(shared, key=lambda poem: poem.created, reverse=True)] 
 
    return render(request, 'home.html', { 
        'me': me, 
        'my_poems': poems, 
        'shared': shared, 
    }) 
 
class Create(View): 
    #@method_decorator(canvas_only) 
    def get(self, request, *args, **kwargs): 
        #self.me = request.facebook.graph.get_object('me') 
        form = PoemEntryForm(request.GET) 
        return render(request, 'create.html', { 
            'form': form, 
            'debug': request.session['username'] 
        }) 
 
    #@method_decorator(canvas_only) 
    def post(self, request, *args, **kwargs): 
        if request.session['username']: 
            form = PoemEntryForm(request.POST) 
            poem = Poem() 
            poem.user = request.session['username'] 
            poem.text = request.POST['words'] 
            poem.save() 
            return render(request, 'submitted.html', {}) 
        else: 
            return render(request, 'error_submitting.html', {}) 

提交.html:

<html> 
    <body> 
        <h3>You submitted a poem</h3> 
        <a href="https://finebitstrings.pythonanywhere.com/">Home</a> 
    </body> 
</html> 

请您参考如下方法:

所以交易是这样的。 当 django 或任何正在做回复的回复:missing signed_request. 时，它的真正意思是 session 不包含键 'signed_request' 的条目.您可以在初始请求的 POST 数据中找到此请求。将其保存在 session 中，您就可以开始了。