add not found handle

app/controllers/application_controller.rb

@@ -1,2 +1,11 @@
 class ApplicationController < ActionController::API
+  rescue_from ActionController::RoutingError do |e|
+    render json: {
+      message: e.message
+    }, status: :not_found
+  end
+
+  def not_found
+    raise ActionController::RoutingError, "not found"
+  end
 end

config/routes.rb

@@ -11,4 +11,7 @@
     resources :status, only: [:index]
     resources :sync_errors, only: [:index]
   end
+
+  # 404
+  match '*path', via: :all, to: 'application#not_found'
 end

spec/controllers/application_controller_spec.rb

@@ -0,0 +1,14 @@
+require 'rails_helper'
+
+RSpec.describe ApplicationController, type: :request do
+  let(:body) { Oj.load(response.body) }
+
+  context "not found" do
+    it "demo" do
+      post '/hhh'
+
+      expect(response).to have_http_status(404)
+      expect(body["message"]).to eq "not found"
+    end
+  end
+end