httpserver, Fediverse: show an error message on 404

plugins/Fediverse/plugin.py

@@ -61,7 +61,9 @@ class FediverseHttp(httpserver.SupyHTTPServerCallback):
         if path == "/instance_actor":
             self.instance_actor(write_content)
         else:
-            assert False, repr(path)
+            self.send_response(404)
+            self.end_headers()
+            self.wfile.write(b"Error 404. There is nothing to see here.")
 
     def doWellKnown(self, handler, path):
         actor_url = ap.get_instance_actor_url()

src/httpserver.py

@@ -399,6 +399,7 @@ class SupyWellKnown(SupyHTTPServerCallback):
 
         handler.send_response(404)
         self.end_headers()
+        self.wfile.write(b"Error 404. There is nothing to see here.")
 
 
 DEFAULT_CALLBACKS = {'.well-known': SupyWellKnown()}