Running old site on apache + php and new nginx rails side by side

[dlk]

My current site is running on a dedicated server on apache + php. I am creating my new site in rails and running on nginx.I want to run both sites together for a while while i slowly redirect all pages SEO rank etc to new site.My current site has say domain www.mydomain.com and new site will have www.mydomain.com/en infront of everything as will be mulilingual.My current site is on server A and new site on server B, different locations and i want to figure out the best way to run together.Can i tell apache on server A to whenever see url www.mydomain.com/en point to server B and nginx on server B with run new rails site? I am not trying to share sessions so that simplifies things i hope!!!I can then just turn off server A when ready and just have new site running.If i cant do this i will have to move all my existing site over to server B and run both sites on same server but think that might take ages and dont want to mess with current site much as to lose traffic / seo ranking etcAny help, experience or opinions would be gratefully received!thanks alotrick