Delivering static files on fixed URL in Django

urls.py

import os

from django.http import Http404, FileResponse


def get_static(request, path, content_type):
    path = os.path.join(settings.BASE_DIR, 'pretalx/static', path)
    if not os.path.exists(path):
        raise Http404()
    return FileResponse(open(path, 'rb'), content_type=content_type)

urlpatterns = [
    url('^sw.js', get_static, {'path': 'agenda/js/serviceworker.js', 'content_type': 'application/javascript'})
]