Index: src/routes/activitypub.js
===================================================================
--- src/routes/activitypub.js	(revision f2796d3e767524a548ef7b2f0dd228c23f75e650)
+++ src/routes/activitypub.js	(revision 69b509deb1cd2e740430a5032713f538d22e90d9)
@@ -132,5 +132,5 @@
       return res.redirect(302, src);
     }
-    return AP.sendAP(res, { '@context': 'https://www.w3.org/ns/activitystreams', ...note });
+    return AP.sendAP(res, { '@context': AP.AP_CONTEXT, ...note });
   }
   const site = db.prepare('SELECT * FROM sites WHERE id = ?').get(post.site_id);
@@ -142,5 +142,5 @@
     return res.redirect(302, note.url || (baseUrl(req) + '/'));
   }
-  AP.sendAP(res, { '@context': 'https://www.w3.org/ns/activitystreams', ...note });
+  AP.sendAP(res, { '@context': AP.AP_CONTEXT, ...note });
 });
 
@@ -150,5 +150,5 @@
   const items = AP.getReplyUris(base, req.params.id);
   AP.sendAP(res, {
-    '@context': 'https://www.w3.org/ns/activitystreams',
+    '@context': AP.AP_CONTEXT,
     id: `${base}/ap/notes/${req.params.id}/replies`,
     type: 'OrderedCollection',