---
title: Fanout
summary: Fanout passes the request through the Fanout GRIP proxy and on to a backend.
url: https://www.fastly.com/documentation/reference/compute/sdks/go/compute-sdk-go/x/exp/handoff/fn.Fanout/
---

**Kind:** Function  
**Module:** [handoff](https://www.fastly.com/documentation/reference/compute/sdks/go/compute-sdk-go/x/exp/handoff/)  
**Package:** compute-sdk-go v1.11.0  
**Source:** https://github.com/fastly/compute-sdk-go/blob/d6bf71b04516ed72d6018cab6fff701a865f86e5/x/exp/handoff/handoff.go#L27

```go
func Fanout(backend string) error
```

Fanout passes the request through the Fanout GRIP proxy and on to
a backend.

This can only be used on services that have the Fanout feature enabled.

The sending completes in the background. Once this method has been
called, no other response can be sent to this request, and the
application can exit without affecting the send.

**Parameters**

- `backend`: `string`

**Returns**

`error`