Ring自带以下中间件:

• In ring/ring-core:
  • wrap-cookies (ring.middleware.cookies)
  • wrap-file (ring.middleware.file)
  • wrap-file-info (ring.middleware.file-info)
  • wrap-flash (ring.middleware.flash)
  • wrap-keyword-params (ring.middleware.keyword-params)
  • wrap-multipart-params (ring.middleware.multipart-params
  • wrap-nested-params (ring.middleware.nested-params
  • wrap-params (ring.middleware.params)
  • wrap-session (ring.middleware.session)
• In ring/ring-devel:
  • wrap-lint (ring.middleware.lint)
  • wrap-reload (ring.middleware.reload)
  • wrap-stacktrace (ring.middleware.stacktrace)