環境 liunx Ruby on Rails 2.3.5 twitter oauth 事象 twitter apiで認証処理(oauth)後 Internal Errorになる apacheのエラーログ(例:/var/log/httpd/error.log)を見ると [ pid=XXXX file=ext/apache2/Hooks.cpp:645 time= ]: The backend application (process XXXX) did not send a valid HTTP response; instead, it sent nothing at all. It is possible that it has crashed; please check whether there are crashing bugs in this application. という