Delivering static files on fixed URL in Django

urls.py

import os
import mimetypes

from django.contrib.staticfiles.storage import staticfiles_storage
from django.http import Http404, FileResponse


def static_file(request, path, content_type=None):
    if not staticfiles_storage.exists(path):
        raise Http404()
    content_type = content_type or mimetypes.guess_type(path)[0]
    response = FileResponse(content_type=content_type)
    with staticfiles_storage.open(path) as f:
        response.write(f)
    return response


urlpatterns = [
    url(r'^sw.js$', static_file, {'path': 'agenda/js/serviceworker.js'})
]