. , route.rb A, URL. : host .
:
A Routes.rb:
...
map.resource whatever
...
Site A Controller:
...
redirect_to edit_whatever_url(:host => "www.siteB.com", :my_parameter => 123)
...
- SiteB ( ) http://www.siteB.com/whaterver/edit?my_parameter=123, .
: , Post 302 , RFC 2616. , URL-, .