You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: events.rb
    path of file: ./repos/ferrocarril/mruby-gems/vendor/ruby/2.6.0/gems/rack-2.0.7/lib/rack
    
    the code of the file until where you have to start completion: require 'rack/response'
require 'rack/body_proxy'

module Rack
  ### This middleware provides hooks to certain places in the request /
  #response lifecycle.  This is so that middleware that don't need to filter
  #the response data can
    
    def call env
      request = make_request env
      on_start request, nil

      begin
        status, headers, body = @app.call request.env
        response = make_response status, headers, body
        on_commit request, response
      rescue StandardError => e
        on_error request, response, e
        on_finish request, response
        raise
      end