rails4ã§rack rewriteã®è¨å® rails4ã§ã¯ãããã©ã«ãã§thread safeãé©ç¨ããã¦ããã ãã®ããã以ä¸ã®ãããªinitializeã®æ¸ãæ¹ãããã¨æãããããããªã®ç¡ãããã£ã¦ãªæãã§ã Hoge::Application.config.middleware.insert_before(Rack::Lock, Rack::Rewrite) do ãã®ããã以ä¸ã®ããã«Runtimeã«ãã Hoge::Application.config.middleware.insert_before(Rack::Runtime, Rack::Rewrite) do åè Rails 4 is thread safe by default [Rails 4 Countdown to 2013]rack-rewrite with Rails 3.2.3 on Heroku 4
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