## 0.4. Conventions in This Book

`Constant Width`

  is used for HTTP headers, status codes, MIME content types, directives in configuration files, arrays, operators, variable names (except in examples), and computer output in text.

Italics

  is used for filenames, pathnames, newsgroup names, Internet addresses (URLs), email addresses, terms being introduced, commands, options/switches, program names, subroutine names, functions, methods, and hostnames.

ALL CAPS

  is used for environment variables, HTML attributes, and HTML tags (within angle brackets <>).

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