所需文件
- stringio
- active_support/inflector
- action_dispatch/http/headers
- action_controller/metal/exceptions
- rack/request
- action_dispatch/http/cache
- action_dispatch/http/mime_negotiation
- action_dispatch/http/parameters
- action_dispatch/http/filter_parameters
- action_dispatch/http/upload
- action_dispatch/http/url
- active_support/core_ext/array/conversions
命名空间