Localhost cookies don't work properly
 

I'm trying to test out a web app running on "http://localhost.3000". When I go to log in, it never works. I checked my cookies, it listed 2 cookies for "localhost.local", which were correct, but it apparently never sent the cookies to the server. When I changed the server address to use 127.0.0.1 instead of localhost, I could log in just fine.

Note that this all works perfectly in Safari.