Function log_combined

async fn log_combined(
    logger: &Sender<LogMessage>,
    client_ip: IpAddr,
    auth_user: Option<String>,
    method: String,
    request_path: String,
    protocol: String,
    status_code: u16,
    content_length: Option<u64>,
    referrer: Option<String>,
    user_agent: Option<String>,
)