Формы POST запрос

Содержимое файла urls.py

from django.conf.urls import url
from . import views

urlpatterns = [
    url(r'^my_page_with_form/', views.my_page_with_form, name='my_page_with_form'),
    url(r'^my_page_with_answer/', views.my_page_with_answer, name='my_page_with_answer'),
    url(r'^count_summa_of_numbers/', views.count_summa_of_numbers, name='count_summa_of_numbers')
]

Содержание файла views.py

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

def my_page_with_form(request):
    return render(request, 'prilogenie111/my_page_with_form.html', {})

def my_page_with_answer(request):
    return render(request, 'prilogenie111/my_page_with_answer.html', {})

def count_summa_of_numbers(request):
    a = str( request.POST['a'] )
    b = str( request.POST['b'] )
    summa = float(a) + float(b)

    print("Find Summa:")
    print(a)
    print(b)
    print(summa)

    return HttpResponseRedirect("/my_page_with_answer/" + str(summa))

Содержание HTML страницы с формой ввода чисел

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Form Page</title>
</head>
<body>

<h1>Form Page</h1>
<hr>

<form action = "/count_summa_of_numbers/" method = "POST">
    {% csrf_token %}
    A <input type = "text" name = 'a'>
    <br>
    <br>
    B <input type = "text" name = 'b'>
    <br>
    <br>
    <input type = "submit" value = "Получить сумму">
</form>

</body>
</html>

Содержание HTML страницы, на которой выводится результат вычислений

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Answer Page</title>
</head>
<body>

<h1>Answer Page</h1>
<hr>

<h3 id = "myContent"></h3>

<a href = "/my_page_with_form/">Вернуться</a>

<script>
    "use strict";

    window.onload = function() {
        const myContent = document.getElementById("myContent");
        const mass = (window.location + "").split("/");
        const answer = mass[mass.length - 1].toString();
        myContent.innerHTML = answer;
    }
</script>

</body>
</html>

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