return 404s for all unmatched api routes

app/controllers/api/v1/deprecated_controller.rb

@@ -4,7 +4,7 @@ module Api
     class DeprecatedController < ApplicationController
       # rubocop:disable Style/MethodMissing
       def method_missing
-        render json: { error: '/api/v1 is deprecated! Please use /api/v2 instead.' }
+        render json: { error: '/api/v1 is deprecated! Please use /api/v2 instead.' }, status: :gone
       end
       # rubocop:enable Style/MethodMissing
     end

app/controllers/api/v2/restful_controller.rb

@@ -29,6 +29,11 @@ module Api
         head :no_content
       end
 
+      def catch_404
+        skip_authorization
+        render json: { error: '404 Not found' }, status: :not_found
+      end
+
       private
 
       def accessible_records

config/routes.rb

@@ -77,6 +77,7 @@ Metamaps::Application.routes.draw do
       resources :users, only: [:index, :show] do
         get :current, on: :collection
       end
+      match '*path', to: 'restful#catch_404', via: :all
     end
     namespace :v1, path: '/v1' do
       # api v1 routes all lead to a deprecation error method
@@ -88,7 +89,9 @@ Metamaps::Application.routes.draw do
       resources :tokens, only: [:create, :destroy] do
         get :my_tokens, on: :collection
       end
+      match '*path', to: 'deprecated#method_missing', via: :all
     end
+    match '*path', to: 'v2/restful#catch_404', via: :all
   end
 
   devise_for :users, skip: :sessions, controllers: {