res = Response.new
res.status #=> '200 OK'

res.status = HTTP::STATUS_NOT_FOUND

res.add_header('Content-Type', 'text/plain')
res.body = 'test'

puts res =<<EOF
HTTP/1.1 404 Not Found
Date: .......
Content-Type: text/plain
Content-Length: 4

test
EOF

res.to_s #=> same thing

# response construction
res = Response.new(:status => HTTP::STATUS_NOT_FOUND, :content_type => 'text/plain', :body => 'test')

# redirection
res = Response.redirect(url, permanent = true/false)

# serving static files
res = Response.from_file(path, :directory_listing => true)

# serving templates
res = Response.from_template(path, binding)

res = Response.streaming(:content_type => 'text/plain', :body => '', :rate => 1) do
  unless timed_out?
    send_data("#{Time.now}: hello there!")
  end
end

# headers
res.add_header('Content-Type', 'text/plain')
res.content_type = 'text/plain' # through method_missing

# cookies
res.set_cookie(:skey, '1235dfavbc5331', :path => '/', :domain => 'reality-scada.net', :ttl => 32330)

res.set_cookie(:skey, '1233142344', :expires => Time.now + 300)

res.delete_cookie(:skey)

res.validate_cache(req, )