Rack::Date middleware

rack_date.rb

## Rack middleware for adding a Date http header
## Some http servers do not set this, so use only if necessary
require 'time'
module Rack
    class Date
        def initialize(app)
            @app = app
        end

        def call(env)
            status, headers, response = @app.call(env)
            headers['Date'] ||= Time.now.httpdate
            [status, headers, response]
        end
    end
end