Is there a reason not to pass ctx on Custom Transporter?

i want add request log
```ts
app.use(logger((ctx, str, args) => {
console.log(str, ctx.request.ip); // ctx.request.header['user-agent'], etc...
}))
```

Review the custom transporter entry point and the open pull request #83 first. Determine how the logger callback currently receives its arguments and whether request context can be exposed there. Done means the proposed callback can access ctx for request logging, with the existing logger behavior preserved.

Written by the indexing model from the issue text.