HTTP: Connection

The first part of an HTTP transaction is the connection.

The client program connects to the server by a TCP connection at the address specified in the Uniform Resource Locator (URL); the translation of the name address into the numeric four-byte Internet address is done by lower network layers, not by HTTP.

The standard port for World Wide Web servers is 80, but this can be changed at the time that the server program is run (usually at startup).