app/controllers/spree/api/classifications_controller.rb in solidus_api-1.3.2 vs app/controllers/spree/api/classifications_controller.rb in solidus_api-1.4.0.beta1

@@ -9,10 +9,10 @@
           taxon_id: params[:taxon_id]
         )
         # Because position we get back is 0-indexed.
         # acts_as_list is 1-indexed.
         classification.insert_at(params[:position].to_i + 1)
-        render nothing: true
+        head :ok
       end
     end
   end
 end