Following statements are similar to the ones described in Logging configuration, but apply only to the listener they appear in.
Specify the format to use to log HTTP requests. name is a name
of a custom format, defined earlier using the LogFormat
directive, or one of six built-in format names.
If numeric argument is used, it refers to a built-in format by its number (0 through 5).
See Logging, for a detailed description of HTTP request logging.