If your running vagrant and you're forwarding traffic to vagrant over 8080, but you really prefer to hit port 80, you can use Mac's pfctl function.
Here's a couple of links that you might find helpful
https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man8/pfctl.8.html
http://krypted.com/mac-os-x/a-cheat-sheet-for-using-pf-in-os-x-lion-and-up/
I was reading this article http://salvatore.garbesi.com/vagrant-port-forwarding-on-mac/ and it suggested adding a vagrant plugin, but it's a ruby gem. Hard to imagine, but the gem failed to install.
You can still implement port forwarding. Create a pfctl.conf file in your vagrant folder:
echo "rdr pass on lo0 inet proto tcp from any to 127.0.0.1 port 80 -> 127.0.0.1 port 8080
rdr pass on lo0 inet proto tcp from any to 127.0.0.1 port 443 -> 127.0.0.1 port 8443" > pfctl.conf
To run this, you first need to enable pfctl
pfctl -e -f pfctl.conf
Once you enable the firewall rules, you can hit your vagrant box by going against localhost.
To disable pfctl:
pfctl -d
