Sample handler:
```go
    handler :=  func(ctx context.Context, payload []byte, in <-chan []byte, out chan<- []byte) *RemoteErr {
        fmt.Println("Got request with initial payload", p, "from", GetCaller(ctx context.Context))
        fmt.Println("Subroute:", GetSubroute(ctx))
        for {
            select {
            case <-ctx.Done():
                return nil
            case req, ok := <-in:

Fan-Out uploads are automatically enabled if `x-minio-fanout-list` form-field is provided with the PostUpload API, to keep things simple higher level APIs are provided in our SDKs for example in `minio-go` SDK:

```
PutObjectFanOut(ctx context.Context, bucket string, fanOutContent io.Reader, fanOutReq minio.PutObjectFanOutRequest) ([]minio.PutObjectFanOutResponse, error)

listen for event notifications using the [`event` sub-command](https://min.io/docs/minio/linux/reference/minio-mc/mc-event-add.html). MinIO SDK's [`BucketNotification` APIs](https://min.io/docs/minio/linux/developers/go/API.html#setbucketnotification-ctx-context-context-bucketname-string-config-notification-configuration-error) can also be used. The notification message MinIO sends to publish an event is a JSON message with the following [structure](https://docs.aws.amazon.com/AmazonS3/latest/dev/n...

```

## Invoke Lambda transformation via PresignedGET

Following example shows how you can use [`minio-go` PresignedGetObject](https://min.io/docs/minio/linux/developers/go/API.html#presignedgetobject-ctx-context-context-bucketname-objectname-string-expiry-time-duration-reqparams-url-values-url-url-error)
```go
package main

import (
	"context"
	"log"
	"net/url"
	"time"
	"fmt"