# class Rack::ShowStatus

`Rack::ShowStatus` catches all empty responses and replaces them with a site explaining the error.

Additional details can be put into `rack.showstatus.detail` and will be shown as HTML. If such details exist, the error page is always rendered, even if the reply was not empty.

### Public Class Methods

new(app) click to toggle source

    # File lib/rack/show_status.rb, line 14
    def initialize(app)
      @app = app
      @template = ERB.new(TEMPLATE)
    end

### Public Instance Methods

call(env) click to toggle source

    # File lib/rack/show_status.rb, line 19
    def call(env)
      status, headers, body = @app.call(env)
      headers = Utils::HeaderHash[headers]
      empty = headers[CONTENT_LENGTH].to_i <= 0

      # client or server error, or explicit message
      if (status.to_i >= 400 && empty) || env[RACK_SHOWSTATUS_DETAIL]
        # This double assignment is to prevent an "unused variable" warning.
        # Yes, it is dumb, but I don't like Ruby yelling at me.
        req = req = Rack::Request.new(env)

        message = Rack::Utils::HTTP_STATUS_CODES[status.to_i] || status.to_s

        # This double assignment is to prevent an "unused variable" warning.
        # Yes, it is dumb, but I don't like Ruby yelling at me.
        detail = detail = env[RACK_SHOWSTATUS_DETAIL] || message

        body = @template.result(binding)
        size = body.bytesize
        [status, headers.merge(CONTENT_TYPE => "text/html", CONTENT_LENGTH => size.to_s), [body]]
      else
        [status, headers, body]
      end
    end