Mastodon nginx: ActivityPub routing

installation/mastodon.conf

@@ -8,6 +8,14 @@ map $http_upgrade $connection_upgrade {
   ''      close;
 }
 
+# ActivityPub routing.
+map $http_accept $activitypub_location {
+  default /index.html;
+  "application/activity+json" @proxy;
+  # Increase `map_hash_bucket_size` to enable this route:
+  # 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"' @proxy;
+}
+
 upstream backend {
   server 127.0.0.1:3000 fail_timeout=0;
 }
@@ -71,13 +79,11 @@ server {
     try_files /dev/null @proxy;
   }
 
-  # # Mastodon ActivityPub routes.
+  # Mastodon ActivityPub routes.
-  # # Conditionally send to Mastodon by Accept header.
+  # Conditionally send to Mastodon by Accept header.
-  # if ($http_accept = "application/activity+json" || $http_accept = "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"") {
+  location ~ ^/(inbox|outbox|users|@(.+)) {
-  #   location ~ ^/(inbox|outbox|users|@) {
+    try_files $activitypub_location $activitypub_location;
-  #     try_files /dev/null @proxy;
+  }
-  #   }
-  # }
 
   # Mastodon public files.
   # https://github.com/mastodon/mastodon/tree/main/public