add glob patten for missing routes

app/controllers/static_controller.rb

@@ -8,6 +8,10 @@ class StaticController < ApplicationController
     redirect_to(url || posts_path)
   end
 
+  def not_found
+    render text: "not found", status: :not_found
+  end
+
   def error
   end
 end

config/routes.rb

@@ -420,4 +420,6 @@ Rails.application.routes.draw do
   get "/intro" => redirect("/explore/posts/intro")
 
   root :to => "posts#index"
+
+  get "*other", :to => "static#not_found"
 end