My Rails应用程序会不时抛出ActionController :: InvalidAuthenticityToken。它每个月左右自发发生一次。因为我不认为有其他网站在尝试CSRF攻击，所以我开始对这些罕见的事件做出我的想法。我的结论到目前为止：
是否有其他原因造成这种误报拒绝？
请不要解释CSRF是什么; - ）
以下是一些日志...
F, [2016-12-06T16:03:59.050673 #15136] FATAL -- :
ActionController::InvalidAuthenticityToken (ActionController::InvalidAuthenticityToken):
actionpack (4.2.7) lib/action_controller/metal/request_forgery_protection.rb:181:in `handle_unverified_request'
actionpack (4.2.7) lib/action_controller/metal/request_forgery_protection.rb:209:in `handle_unverified_request'
devise (4.2.0) lib/devise/controllers/helpers.rb:253:in `handle_unverified_request'
actionpack (4.2.7) lib/action_controller/metal/request_forgery_protection.rb:204:in `verify_authenticity_token'
activesupport (4.2.7) lib/active_support/callbacks.rb:432:in `block in make_lambda'
activesupport (4.2.7) lib/active_support/callbacks.rb:164:in `block in halting'
activesupport (4.2.7) lib/active_support/callbacks.rb:504:in `block in call'
activesupport (4.2.7) lib/active_support/callbacks.rb:504:in `each'
activesupport (4.2.7) lib/active_support/callbacks.rb:504:in `call'
activesupport (4.2.7) lib/active_support/callbacks.rb:92:in `__run_callbacks__'
activesupport (4.2.7) lib/active_support/callbacks.rb:778:in `_run_process_action_callbacks'
activesupport (4.2.7) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.7) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.2.7) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.2.7) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
activesupport (4.2.7) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (4.2.7) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.2.7) lib/active_support/notifications.rb:164:in `instrument'
actionpack (4.2.7) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.2.7) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
actionpack (4.2.7) lib/abstract_controller/base.rb:137:in `process'
actionview (4.2.7) lib/action_view/rendering.rb:30:in `process'
actionpack (4.2.7) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.2.7) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.2.7) lib/action_controller/metal.rb:237:in `block in action'
actionpack (4.2.7) lib/action_dispatch/routing/route_set.rb:74:in `dispatch'
actionpack (4.2.7) lib/action_dispatch/routing/route_set.rb:43:in `serve'
actionpack (4.2.7) lib/action_dispatch/routing/mapper.rb:49:in `serve'
actionpack (4.2.7) lib/action_dispatch/journey/router.rb:43:in `block in serve'
actionpack (4.2.7) lib/action_dispatch/journey/router.rb:30:in `each'
actionpack (4.2.7) lib/action_dispatch/journey/router.rb:30:in `serve'
actionpack (4.2.7) lib/action_dispatch/routing/route_set.rb:817:in `call'
turnout (2.3.1) lib/rack/turnout.rb:25:in `call'
omniauth (1.3.1) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.3.1) lib/omniauth/strategy.rb:164:in `call'
omniauth (1.3.1) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.3.1) lib/omniauth/strategy.rb:164:in `call'
rack-attack (4.4.1) lib/rack/attack.rb:107:in `call'
exception_notification (4.2.1) lib/exception_notification/rack.rb:32:in `call'
warden (1.2.6) lib/warden/manager.rb:35:in `block in call'
warden (1.2.6) lib/warden/manager.rb:34:in `catch'
warden (1.2.6) lib/warden/manager.rb:34:in `call'
rack (1.6.4) lib/rack/etag.rb:24:in `call'
rack (1.6.4) lib/rack/conditionalget.rb:38:in `call'
rack (1.6.4) lib/rack/head.rb:13:in `call'
actionpack (4.2.7) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.2.7) lib/action_dispatch/middleware/flash.rb:260:in `call'
rack (1.6.4) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.6.4) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.2.7) lib/action_dispatch/middleware/cookies.rb:560:in `call'
actionpack (4.2.7) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.2.7) lib/active_support/callbacks.rb:88:in `__run_callbacks__'
activesupport (4.2.7) lib/active_support/callbacks.rb:778:in `_run_call_callbacks'
activesupport (4.2.7) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.7) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.2.7) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
actionpack (4.2.7) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.2.7) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.2.7) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.2.7) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.2.7) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.2.7) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.2.7) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.2.7) lib/rails/rack/logger.rb:20:in `call'
ahoy_matey (1.4.2) lib/ahoy/engine.rb:22:in `call_with_quiet_ahoy'
request_store (1.3.1) lib/request_store/middleware.rb:9:in `call'
actionpack (4.2.7) 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 (4.2.7) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
rack (1.6.4) lib/rack/sendfile.rb:113:in `call'
actionpack (4.2.7) lib/action_dispatch/middleware/ssl.rb:24:in `call'
railties (4.2.7) lib/rails/engine.rb:518:in `call'
railties (4.2.7) lib/rails/application.rb:165:in `call'
/usr/lib/ruby/vendor_ruby/phusion_passenger/rack/thread_handler_extension.rb:97:in `process_request'
/usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:160:in `accept_and_process_next_request'
/usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:113:in `main_loop'
/usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler.rb:416:in `block (3 levels) in start_threads'
/usr/lib/ruby/vendor_ruby/phusion_passenger/utils.rb:113:in `block in create_thread_and_abort_on_exception'
答案 0 :(得分：2)
关于解决方案，我和Dorian在一起。
如果你正在寻找原因，那我this issue report in rails github确实是正面的，尤其是这个小部分：
#Browet退出，清除会话cookie
＃浏览器重新打开，无需执行请求即可从缓存重新加载页面
这是特别正确的，因为defualt Rails使用turbolinks来鼓励缓存（如果我记得，默认为10页）。
可以复制的另一种方法是让用户加载您的DOM（以及您的cookie /会话）然后让他们通过浏览器管理工具手动销毁他们的会话或cookie （例如：chrome：// settings）。这也应该重现错误，因为你在表单中有csrf的隐藏标签，但不是会话cookie ......你需要两者。
答案 1 :(得分：0)
您可能应该在生产环境中使会话无效，而不是抛出异常：
在您ApplicationController（或您关注的任何控制器）中添加：
protect_from_forgery with: :null_session
如果您真的很担心，我的建议是将错误记录到Bugsnag中，然后您就可以查看请求并了解其发生的原因。