test-cookies.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'sinatra'
require 'time'

get '/' do
  haml <<END

%h1 test cookies.

%p
  current:
  %code= request.cookies.inspect

%form{:method => 'post'}
  name:
  %input{:name => 'name'}
  %br
  value:
  %input{:name => 'value'}
  %br
  domain:
  %input{:name => 'domain'}
  %br
  path:
  %input{:name => 'path'}
  %br
  expires:
  %input{:name => 'expires'}
  %br
  %input{:type => 'submit'}

END
end

post '/' do
  value = {:value => params[:value]}
  value[:domain]  = params[:domain] unless params[:domain].empty?
  value[:path]    = params[:path] unless params[:path].empty?
  value[:expires] = Time.parse(params[:expires]) unless params[:expires].empty?

  response.set_cookie(params[:name], value)
  redirect '/'
end