switch ($response_code) {
    case '200' {              # OK
        print_response $response_content;
        exit  0;
    }
    case '400' { exit  1; }   # BAD_INPUT
    case '403' { exit 31; }   # SERVICE_ACCESS_ERROR
    case '500' { exit 32; }   # SERVICE_EXECUTION_ERROR
    case '503' { exit 30; }   # SERVICE_ERROR
    else       { exit -1; }
}

##</code><code>##

for ($response_code) {
    if ($_ == 200) {         # OK
        print_response $response_content;
        exit 0;
    };

    $_ == 400 and exit  1;   # BAD_INPUT
    $_ == 403 and exit 31;   # SERVICE_ACCESS_ERROR
    $_ == 500 and exit 32;   # SERVICE_EXECUTION_ERROR
    $_ == 503 and exit 30;   # SERVICE_ERROR

    exit 255;
}