Creating a Socket Server

The most primitive type of networking uses sockets: gateways for communication. Applications create sockets to allow for interactions; for example, the MySQL database server creates a mysql.sock file when it’s running; any client that needs to communicate with a database uses that socket.

A socket consists of a protocol, an IP address, and a port. The two most common protocols are TCP (Transmission Control Protocol) and UDP (User Datagram Protocol). Ruby can make use of either protocol; in this chapter I’ll demonstrate TCP, which is more common. The IP address identifies a computer. Servers available on the Internet use a meaningful IP address, whereas those on local networks have dummy ones. A socket’s port is an integer ...

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