1 files changed, 0 insertions, 13 deletions
diff --git a/railties/lib/rails/commands/server/server_command.rb b/railties/lib/rails/commands/server/server_command.rb
index 6c4cc3cb86..47c3f05bb3 100644
--- a/railties/lib/rails/commands/server/server_command.rb
+++ b/railties/lib/rails/commands/server/server_command.rb
@@ -21,19 +21,6 @@ module Rails
       set_environment
     end
 
-    def app
-      @app ||= begin
-        app = super
-        if app.is_a?(Class)
-          ActiveSupport::Deprecation.warn(<<-MSG.squish)
-            Using `Rails::Application` subclass to start the server is deprecated and will be removed in Rails 6.0.
-            Please change `run #{app}` to `run Rails.application` in config.ru.
-          MSG
-        end
-        app.respond_to?(:to_app) ? app.to_app : app
-      end
-    end
-
     def opt_parser
       Options.new
     end