HTTP is called a stateless protocol because each command is executed independently, without any knowledge of the commands that came before it. This is the main reason that it is difficult to implement Web sites that react intelligently to user input.
The name 'Apache' was chosen from respect for the Native American Indian tribe of Apache, well-known for their superior skills in warfare strategy and their inexhaustible endurance .
Secondarily, and more popularly (though incorrectly) accepted, it's a considered cute name which stuck. Apache is " A PA t CH y server". It was based on some existing code and a series of "patch files".
Allowing the hosting of more than one web site by associating more than one IP address with a system.
Allows daemon to identify request’s destination IP address.
Single Linux machine responds on the network to more IP addresses than it has physical network interfaces. Each of the result “virtual” network interfaces can be associated with a corresponding domain name that users on the Internet might want to connect to.