Middleware to support prefixed value in the url

middleware.rb

class MyMiddleware
  def initialize(app)
    @app = app
    @message = message
  end

  def call(env)
    dup._call(env)
  end

  def _call(env)
    _, script_name, request_path = env['REQUEST_PATH'].split('/', 3)
    env['SCRIPT_NAME'] = '/' + script_name
    env['PATH_INFO'] = '/' + request_path
    env['REQUEST_PATH'] = '/' + request_path
    env['REQUEST_URI'] = '/' + request_path
    @status, @headers, @response = @app.call(env)
    [@status, @headers, self]
  end

  def each(&block)
    @response.each(&block)
  end
end