(Since version 2.1.0) Use org.scalatra.Action
(Since version 2.1.0) Use org.scalatra.MultiParams
(Since version 2.1.0) Use org.scalatra.EnvironmentKey
(Since version 2.1.0) Use org.scalatra.MultiParamsKey
(Since version 2.0.0) Use CsrfTokenSupport.DefaultKey
(Since version 2.0.0) Use HttpMethod.methods
(Since version 2.0.0) Use HttpMethod.methods filter { !_.isSafe }