The default value to use for substitution, which SHALL be sent if an
alternate value is not supplied. Note this behavior is different than the
Schema Object’s
treatment of default values, because in those cases parameter values are
optional. If the
enum
is
defined, the value MUST exist in the enum’s values.
Optional
descriptionAn optional description for the server variable. CommonMark syntax MAY be used for rich text representation.
Optional
enumAn enumeration of string values to be used if the substitution options are from a limited set. The array MUST NOT be empty.
An object representing a Server Variable for server URL template substitution.
See
https://spec.openapis.org/oas/latest.html#server-variable-object