'400':
          description: bad request
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    description: error message
                    type: string

        error($c, "The user name ‘$owner’ does not exist.")

        badRequest($c, "The user name ‘$owner’ does not exist.")

    error notFound gone accessDenied

    error notFound gone accessDenied badRequest

sub badRequest {
    my ($c, $msg) = @_;
    error($c, $msg, 400);
}