Merge pull request rails#47885 from zzak/rack-3-rackup-server

Fix Rack::Deprecation warning which causes this test to fail

Author: guilleiguaran

railties/lib/rails/commands/server/server_command.rb

@@ -6,10 +6,10 @@
 require "active_support/core_ext/string/filters"
 require "rails/dev_caching"
 require "rails/command/environment_argument"
-require "rack/server"
+require "rails/rackup/server"
 
 module Rails
-  class Server < ::Rack::Server
+  class Server < Rackup::Server
     class Options
       def parse!(args)
         Rails::Command::ServerCommand.new([], args).server_options

railties/lib/rails/rackup/server.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+# :enddoc:
+
+module Rails
+  module Rackup
+    begin
+      require "rackup/server"
+      Server = ::Rackup::Server
+    rescue LoadError
+      require "rack/server"
+      Server = ::Rack::Server
+    end
+  end
+end