mylake: Rails Middleware Walkthrough

ActionDispatch::Static => provide static file on public

Rack::Lock => lock the app down to a single thread

ActiveSupport::Cache::Strategy::LocalCache::Middleware => cache method based on ActiveSupport::Cache::FileStore

easy to use by Rails.cache.read or Rails.cache.write

Rack::Runtime => sets an X-Runtime response header to show spending time

Rack::MethodOverride => if set params[:_method], could reset http method, ex put, delete on form

ActionDispatch::RequestId => set unique request id

Rails::Rack::Logger => log when request start, and request end

ActionDispatch::ShowExceptions & ActionDispatch::DebugExceptions => rescue error, and custom format

ActionDispatch::RemoteIp => detect ip attack

ActionDispatch::Reloader => reload classes in development mode

ActionDispatch::Callbacks => We can call before or after methods on this and pass in a block which will then be triggered on each request.

ActiveRecord::ConnectionAdapters::ConnectionManagement => clear db connections

ActiveRecord::QueryCache => active record query cache

ActionDispatch::Cookies, Session::CookieStore and Flash => set cookie, sessions

ActionDispatch::ParamsParser => prepare params

ActionDispatch::Head => transfer head request to get

Rack::ConditionalGet and Rack::ETag => set ETag header based on the response body, conditional => if not changed, not process => only send 304

ActionDispatch::BestStandardsSupport => add recommend browser to client

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