Here are two methods to output an HTML template as it is using Django's TemplateView class, but replacing strings in the output result at once.

We will handle this in urls.py without using middleware.

Method 1: Decorate the result of as_view

urls.py

url(r'^hoge-page/$',
     TemplateView.as_view(
         template_name="hoge-page"),
     name='hoge-page'),

▲ Change this to:

url(r'^hoge-page/$',
     content_replace_decorator(TemplateView.as_view(
         template_name="hoge-page")),
     name='hoge-page'),

▲ We will use a decorator to perform string replacement in the output result in this form.

def content_replace_decorator(func):

    @functools.wraps(func)
    def wrapper(view, *args, **kwargs):
        result = func(view, *args, **kwargs)

        def callback(response):
            response.content = response.content.replace(
                FROM_WORD.encode('utf-8'),
                TO_WORD.encode('utf-8'))

        if isinstance(result, HttpResponse):
            result.add_post_render_callback(callback)
        return result

    return wrapper

Method 2: Create a class that inherits from TemplateView

url(r'^hoge-page/$',
     TemplateView.as_view(
         template_name="hoge-page"),
     name='hoge-page'),

▲ Change this to:

url(r'^hoge-page/$',
     ContentReplaceTemplateView.as_view(
         template_name="hoge-page"),
     name='hoge-page'),

▲ Consider a class that performs string replacement in the output result.

class ContentReplaceTemplateView(TemplateView):
    @staticmethod
    def callback(response):
        response.content = response.content.replace(
            FROM_WORD.encode('utf-8'),
            TO_WORD.encode('utf-8'))

    def get(self, request, *args, **kwargs):
        result = super(ContentReplaceTemplateView, self).get(
            request, *args, **kwargs)
        result.add_post_render_callback(self.callback)
        return result

In any case, the key point is to insert the conversion method into the add_post_render_callback of the HttpResponse instance.

If you try to directly manipulate the content of the HttpResponse instance without doing this, an exception will be raised.