trying if else if. not working.. please help me

and what error is that .. syntax error?

when HTTP_REQUEST {
    if { [string tolower [HTTP::host]] equals "abc.com  " }{
        HTTP::redirect "https://abc.com "
    }
    elseif { [string tolower [HTTP::host]] equals "123.com "}{
        HTTP::redirect "https://123.com   "
    } else {
        HTTP::redirect "https://www.xyz.com "
    }
}