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)

# File lib/rack/runtime.rb, line 16
def initialize(app, name = nil)
  @app = app
  @header_name = HEADER_NAME
  @header_name += "-#{name.to_s.downcase}" if name
end

Public Instance Methods

call (env)

# File lib/rack/runtime.rb, line 22
def call(env)
  start_time = Utils.clock_time
  _, headers, _ = response = @app.call(env)

  request_time = Utils.clock_time - start_time

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

  response
end