#urls
url(r'^sw(.*.js)$', views.sw_js, name='sw_js'),

#views
from django.views.decorators.cache import never_cache
from django.template.loader import get_template
@never_cache
def sw_js(request, js):
    template = get_template('sw.js')
    html = template.render()
    return HttpResponse(html, content_type="application/x-javascript")

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

urlpatterns = [
    # Other urls
    url(r'^service_worker(.*.js)$',
        TemplateView.as_view(template_name='service_worker.js',
            content_type='application/x-javascript'))
    ]

url(r'^service_worker(.*.js)(?:/(?P<params>[a-zA-Z]+)/)?',
        TemplateView.as_view(template_name='service_worker.js', content_type='application/x-javascript'))

var url_params = location.search.substring(1);
console.log(url_params);
 => "foo=bar..."