How to access my local server on my VirtualBox virtual machine?

"I have had the same exact problem, only I was using Windows 7 as a guest.

What I did was Start -> Run -> cmd to bring up the command line.

ipconfig to bring up connection details. Look for the address that looks like 10.x.x.x, that's your Mac.

Now, use that to connect to your local server on your Mac.

For me, it's usually something like http://10.0.2.2:80/blah"