Browsers and Web servers use a special protocol, called the HyperText Transfer Protocol (HTTP), which specifies how a browser should format and send a request to a Web server. The client browser sends a document request consisting of a line of characters terminated by a CR/LF (carriage return/line-feed) pair. A well-behaved server will not require the carriage return character. This request consists of the word GET, a space, and the location of the document relative to the root of the Web server's file system. When a Web server/site is configured, it is usually set up to use a particular directory on the host machine's local file system as the Web site's root directory. Documents are found relative to this directory.