# class Rack::Runtime

Sets an “X-Runtime” response header, indicating the response time of the request, in seconds

You can put it right before the application to see the processing time, or before all the other middlewares to include time for them, too.

### Public Class Methods

new(app, name = nil) click to toggle source

    # File lib/rack/runtime.rb, line 14
    def initialize(app, name = nil)
      @app = app
      @header_name = HEADER_NAME
      @header_name += "-#{name}" if name
    end

### Public Instance Methods

call(env) click to toggle source

    # File lib/rack/runtime.rb, line 20
    def call(env)
      start_time = Utils.clock_time
      status, headers, body = @app.call(env)
      headers = Utils::HeaderHash[headers]

      request_time = Utils.clock_time - start_time

      unless headers.key?(@header_name)
        headers[@header_name] = FORMAT_STRING % request_time
      end

      [status, headers, body]
    end