Empty reply from server - can't connect to vagrant vm w/port forwarding

When running a server from within a VM, start the server on 0.0.0.0 instead of 127.0.0.1.

127.0.0.1 is only accessible to the local machine, which for a VM means nothing outside of the VM can reach it! 0.0.0.0 is accessible from anywhere on the local network, which to a VM includes the host machine.

The answer came from here: Connection Reset when port forwarding with Vagrant

(Which apparently got its answer from here: https://stackoverflow.com/a/5999945/738675)

With help from: https://serverfault.com/questions/78048/whats-the-difference-between-ip-address-0-0-0-0-and-127-0-0-1

Google-bait:

Here are the errors you might receive if this is the problem:

• Chrome: "No data received"
• Firefox: "The connection was reset - The connection to the server was reset while the page was loading."
• Safari: "Safari can’t open the page [URL] because the server unexpectedly dropped the connection"
• curl: "Empty reply from server"

In the /etc/hosts inside the VM, change line
127.0.0.1 localhost -> 0.0.0.0 localhost
and then restart server