COMMON: Notify request

Fire request is the request that not waiting for response. Is just fire and forget.

Example of server middleware for fire.
```js
app.notify(['/user/status/online'], (req, nothing, next) => {
    let data = req.body

    db.findUserByIdAndUpdate(req.user.id, { status: data.status })

    res.send(); // no params
})
```