为什么Rails 4.2.1在生产中寻找index.html（apache2，passenger）

Question

我已经在生产环境中部署了以下软件堆栈：Rails 4.2.1 Apache 2 Passenger 5.0.13

通过浏览器请求应用程序时，这是production.log上的错误：

[2015-07-12T17：22：23.089940＃5378]信息-：在2015-07-12 17:22:23 +0000 F，[2015-07-12T17]为10.0.0.89开始GET“ /index.html” ：22：23.090858＃5378]致命-：ActionController :: RoutingError（没有路由与[GET]“ /index.html”匹配）：actionpack（4.2.1）lib / action_dispatch / middleware / debug_exceptions.rb：21：in call'
actionpack (4.2.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in call'
actionpack (4.2.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in call'
actionpack (4.2.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in call'
railties（4.2.1）lib / rails / rack / logger.rb：38：在call_app' railties (4.2.1) lib/rails/rack/logger.rb:20:in在call'activesupport中（4.2.1） lib / active_support / tagged_logging.rb：68： block in tagged'
activesupport (4.2.1) lib/active_support/tagged_logging.rb:26:in block in tagged'
activesupport (4.2.1) lib/active_support/tagged_logging.rb:26:in block in tagged'
activesupport (4.2.1) lib/active_support/tagged_logging.rb:26:in标签中'activesupport（4.2.1）lib / active_support / tagged_logging.rb：68：在tagged' railties (4.2.1) lib/rails/rack/logger.rb:20:in通话中动作包（4.2.1）lib / action_dispatch / middleware / request_id.rb：21： call' rack (1.6.4) lib/rack/methodoverride.rb:22:in通话中机架（1.6.4）lib / rack / runtime.rb：18： call' activesupport (4.2.1) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in调用中的机架（1.6.4）lib / rack /sendfile.rb:113： call' railties (4.2.1) lib/rails/engine.rb:518:in调用中的Railties（4.2.1）lib / rails / application.rb：164： call'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p643/gems/passenger-5.0.13/lib/phusion_passenger/rack/thread_handler_extension.rb:94:in call'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p643/gems/passenger-5.0.13/lib/phusion_passenger/rack/thread_handler_extension.rb:94:in call'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p643/gems/passenger-5.0.13/lib/phusion_passenger/rack/thread_handler_extension.rb:94:in process_request'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p643/gems/passenger-5.0.13/lib/phusion_passenger/request_handler/thread_handler.rb:149:in accept_and_process_next_request'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p643/gems/passenger-5.0.13/lib/phusion_passenger/request_handler/thread_handler.rb:110:in accept_and_process_next_request'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p643/gems/passenger-5.0.13/lib/phusion_passenger/request_handler/thread_handler.rb:110:in accept_and_process_next_request'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p643/gems/passenger-5.0.13/lib/phusion_passenger/request_handler/thread_handler.rb:110:in main_loop'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p643/gems/passenger-5.0.13/lib/phusion_passenger/request_handler.rb:415： block (3 levels) in start_threads'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p643/gems/passenger-5.0.13/lib/phusion_passenger/utils.rb:111:in block (3 levels) in start_threads'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p643/gems/passenger-5.0.13/lib/phusion_passenger/utils.rb:111:in block (3 levels) in start_threads'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p643/gems/passenger-5.0.13/lib/phusion_passenger/utils.rb:111:in在create_thread_and_abort_on_exception中的block (3 levels) in start_threads'
/home/ubuntu/.rvm/gems/ruby-2.0.0-p643/gems/passenger-5.0.13/lib/phusion_passenger/utils.rb:111:in块中

我的config / routes.rb如下：

Rails.application.routes.draw do
   root 'sessions#new'
   # - Session Resources - #
   resources :sessions, only: [:new, :create, :destroy]
   resources :password_resets
end

在开发过程中，根页面得到相应的服务，但在生产中，出现上述错误的空白屏幕。

请协助。