HTTP is a very fast and reliable transfer protocol. The default port for HTTP is 80.

Because HTTP transfers are made in clear text, it is not wise to use it to transfer passwords if the networks involved in the transfer are not secure.

IP-less HTTP
It is possible to run several HTTP servers on the same IP address and port, by identifying the servers through the Host header in the HTTP protocol. Since IP addresses are becoming a scarce commodity IP-less virtual servers are becoming increasingly common.

To use IP-less virtual servers you need to configure DNS so that several different names translate to the same IP address. One of your virtual servers needs to listen to this IP address. That virtual server must also contain the IP-less Virtual Hosting module.

For the other virtual servers you will only need to configure their Server Variables/Server URL. The IP-less virtual hosting will use the host header and the virtual servers Server Variables/Server URL to determine which virtual servers are to handle which request. The User Filesystem module can also be used to host several sites with IP-less HTTP. It does this within one virtual server, which means that all sites share the same modules. This sharing is very resource inexpensive and makes it possible to give each user her own domain. IP-less HTTP does not work for proxy servers. That is, a proxy server must have its own IP address. A proxy server can however, proxy requests to web servers that are using IP-less HTTP.

IP-less virtual hosting module
The IP-less virtual hosting module does not need to be configured in any way. Just add it to a virtual server that is listening to a port, and it will send requests to other virtual servers.