Use relative URL for singletons

It's rare they'll be needed externally, and this way there's less to do

website/contrib/singleton_page/tests.py

@@ -9,7 +9,7 @@ from .utils import SingletonPageCache
 class SingletonURLTestCase(TestCase):
     def test_gets_url(self) -> None:
         with self.assertNumQueries(2):
-            self.assertEqual(SingletonPageCache.get_url(HomePage), "http://localhost/")
+            self.assertEqual(SingletonPageCache.get_url(HomePage), "/")
 
     def test_missing_page(self) -> None:
         with self.assertNumQueries(1):

website/contrib/singleton_page/utils.py

@@ -25,7 +25,7 @@ class SingletonPageCache:
             if page is None:
                 return None
 
-            url = page.get_full_url(request)
+            url = page.get_url(request)
 
             cache.set(cache_key, url, 86400)
 

website/well_known/views.py

@@ -24,7 +24,12 @@ class SecurityView(TemplateView):
     def get_context_data(self, **kwargs: dict) -> dict:
         context = super().get_context_data(**kwargs)
         context["security_txt"] = self.request.build_absolute_uri(self.request.path)
-        context["contact_page_url"] = SingletonPageCache.get_url(ContactPage)
+        contact_page_path = SingletonPageCache.get_url(ContactPage)
+        context["contact_page_url"] = (
+            self.request.build_absolute_uri(contact_page_path)
+            if contact_page_path
+            else None
+        )
         context["expires"] = (
             (timezone.now() + self.expires).replace(microsecond=0).isoformat()
         )