I have a app / site that i am running on my local imac and i want to test it on my ipad browser.
Can connect to my imac localhost rails app throught the wifi wit
If the subdomain is just going to 127.0.0.1:3000 (or whatever) you should be able to access it the same way by going to your machine's local IP address with the same supplied port number. I look at my rails app on my phone all the time.
If you have virtual hosts or something set up, it's probably going to be more complicated than that.