Django - 网址调度 - 页面未找到

我很困惑，尽管为它指定了 url，但 URL 调度程序为什么会尝试查找空路径？这是否意味着它无法找到指定的 url，因此试图找到默认值。

当我尝试 POST 和 HttpResponseRedirect 搜索空路径而不是遵循指定的路径时，就会发生这种情况。假设其他。

使用 Django 版本：2.0

提前致谢！

main/urls.py (ROOT_URLCONF)

from django.contrib import admin
from django.urls import path, include

urlpatterns = [
   path('admin/', admin.site.urls),
   path('app/', include('shorterner.urls'))
]

较短的/ urls.py

from django.urls import path
from . import views

urlpatterns = [
  path('request/', views.RequestView.as_view(), name="request"),
  path('list/', views.IndexView.as_view(), name="list")
]

较短/views.py

from django.shortcuts import render, redirect
from django.http import HttpResponseRedirect
from django.conf import settings
from django.urls import reverse
from django.views import View, generic
from .models import Urls

import requests
import json

from .forms import SubmitUrlForm

class RequestView(View):
  form_class = SubmitUrlForm
  initial = { 'url': ''}
  template_name = "shorterner/request.html"
  context_object_name = 'url'

  def form_valid(self, form):
    return super().form_valid(form)

  def get(self, request, *args, **kwargs):
    form = self.form_class(initial=self.initial)
    return render(request, self.template_name, {'form': form})

  def post(self, request, *args, **kwargs):
    form = self.form_class(request.POST)
    if form.is_valid():
      input_url = form.cleaned_data['url']
      short_url = google_url_shorten(input_url)

      print(input_url)
      print(short_url)

      new_url = Urls.create(short_url, input_url)
      new_url.save()

      return HttpResponseRedirect('/app/request/')
    return render(request, self.template_name, {'form': form})

较短/模板/较短/request.html

{% extends 'shorterner/base.html' %}

{% block content %}

    <form action="/" method="POST">
      {% csrf_token %}
      <input type="text" name="url" placeholder="Url..." required/>        
      <input type="submit" value="Submit"/>
    </form>

{% endblock %}

问题错误页面截图