我无法保存用户数据，因为Cookie的大小存在问题（4KB）
I Centos服务器，Nginx，乘客
actionpack (3.2.22) lib/action_dispatch/middleware/cookies.rb:305:in `[]='
actionpack (3.2.22) lib/action_dispatch/middleware/session/cookie_store.rb:64:in `set_cookie'
rack (1.4.7) lib/rack/session/abstract/id.rb:335:in `commit_session'
rack (1.4.7) lib/rack/session/abstract/id.rb:211:in `context'
rack (1.4.7) lib/rack/session/abstract/id.rb:205:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/cookies.rb:341:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.22) lib/active_support/callbacks.rb:405:in `_run__4594969678639542870__call__4298955712328050144__callbacks'
activesupport (3.2.22) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.22) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.22) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.22) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.22) lib/rails/rack/logger.rb:32:in `call_app'
railties (3.2.22) lib/rails/rack/logger.rb:16:in `block in call'
activesupport (3.2.22) lib/active_support/tagged_logging.rb:22:in `tagged'
railties (3.2.22) lib/rails/rack/logger.rb:16:in `call'
quiet_assets (1.1.0) lib/quiet_assets.rb:27:in `call_with_quiet_assets'
actionpack (3.2.22) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.7) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.7) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.22) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.7) lib/rack/lock.rb:15:in `call'
actionpack (3.2.22) lib/action_dispatch/middleware/static.rb:83:in `call'
railties (3.2.22) lib/rails/engine.rb:484:in `call'
railties (3.2.22) lib/rails/application.rb:231:in `call'
railties (3.2.22) lib/rails/railtie/configurable.rb:30:in `method_missing'
passenger (5.0.26) src/ruby_supportlib/phusion_passenger/rack/thread_handler_extension.rb:97:in `process_request'
passenger (5.0.26) src/ruby_supportlib/phusion_passenger/request_handler/thread_handler.rb:160:in `accept_and_process_next_request'
passenger (5.0.26) src/ruby_supportlib/phusion_passenger/request_handler/thread_handler.rb:113:in `main_loop'
passenger (5.0.26) src/ruby_supportlib/phusion_passenger/request_handler.rb:416:in `block (3 levels) in start_threads'
passenger (5.0.26) src/ruby_supportlib/phusion_passenger/utils.rb:113:in `block in create_thread_and_abort_on_exception'