这是我的代码：project/urls/py：

from django.contrib import admin
from django.urls import path
from todoapp import views

urlpatterns = [
    # admin page
    path('admin/', admin.site.urls),
    # home page
    path('', views.index, name='todo'),
    # delete with item_id
    path('del/<str:item_id>', views.remove, name='del'),
]

handler404 = 'todoapp.views.handling404'

和app/views.py:

def remove(request, item_id):
    
    item = get_object_or_404(Todo, id=item_id)
    item.delete()

    messages.info(request, "Item Removed!!!")
    return redirect('todo')

index.html:

<form action="/del/{{item.id}}" method="POST" style="padding-right: 4%; padding-bottom: 3%;">
                        {% csrf_token %}
                        <button value="Remove" type="submit" class="btn btn-primary" style="float: right;">
                            <span class="glyphicon glyphicon-trash">    Remove</span>
                        </button>
                    </form>

当我故意访问eg /del/abc时，我得到了500错误，而不是我预期的404，那么这里真实的的问题是什么？
我试着将str替换为int，然后我去了/del/abc，没有找到我期望的path('del/<int:item_id>', views.remove, name='del'),页面。