为什么我的 rails 站点收到不包含任何跨域请求的 OPTIONS 请求错误？

Question

我的 Rails 应用程序，关闭和打开，遇到致命错误：

ActionController::RoutingError (No route matches [OPTIONS] "/"):

经过一些谷歌搜索，我发现这与跨域请求和使用 CORS 在域之间进行通信有关。不过，该应用程序没有内置任何此类请求。此错误是否意味着有人试图从另一个域联系我的域根目录？还是我遗漏了一些明显的东西？

完整错误：

F, [2016-09-29T21:38:56.500387 #28585] FATAL -- : 
ActionController::RoutingError (No route matches [OPTIONS] "/"):
  actionpack (4.2.5.1) lib/action_dispatch/middleware/debug_exceptions.rb:21:in `call'
  actionpack (4.2.5.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.2.5.1) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.2.5.1) lib/rails/rack/logger.rb:20:in `block in call'
  activesupport (4.2.5.1) lib/active_support/tagged_logging.rb:68:in `block in tagged'
  activesupport (4.2.5.1) lib/active_support/tagged_logging.rb:26:in `tagged'
  activesupport (4.2.5.1) lib/active_support/tagged_logging.rb:68:in `tagged'
  railties (4.2.5.1) lib/rails/rack/logger.rb:20:in `call'
  actionpack (4.2.5.1) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.6.4) lib/rack/methodoverride.rb:22:in `call'
  rack (1.6.4) lib/rack/runtime.rb:18:in `call'
  activesupport (4.2.5.1) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
  rack (1.6.4) lib/rack/sendfile.rb:113:in `call'
  actionpack (4.2.5.1) lib/action_dispatch/middleware/ssl.rb:24:in `call'
  railties (4.2.5.1) lib/rails/engine.rb:518:in `call'
  railties (4.2.5.1) lib/rails/application.rb:165:in `call'
  passenger (4.0.60) lib/phusion_passenger/rack/thread_handler_extension.rb:74:in `process_request'
  passenger (4.0.60) lib/phusion_passenger/request_handler/thread_handler.rb:141:in `accept_and_process_next_request'
  passenger (4.0.60) lib/phusion_passenger/request_handler/thread_handler.rb:109:in `main_loop'
  passenger (4.0.60) lib/phusion_passenger/request_handler.rb:455:in `block (3 levels) in start_threads'

Answer 1

事实证明，服务器 cpu 刚刚超载，我们升级到更大的服务器。我们的新理论是，当 cpu 过载时，负载平衡器正在服务器之间交换用户，这似乎是一个跨域请求。不管事实是否如此，问题都消失了。

为什么我的 rails 站点收到不包含任何跨域请求的 OPTIONS 请求错误？

Why do I receive an OPTIONS request error for my rails site that doesn't contain any cross-domain requests?

ruby-on-rails

options

cors

amazon-elastic-beanstalk