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# FetchEvent.sendEarlyHints()

The **`sendEarlyHints()`** method allows you to send a [103 Early Hints](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/103) response back to the client which made the incoming request to your application.

## Syntax

```js
sendEarlyHints(headers)
```

### Parameters

- `headers`
  - : Any headers you want to add to your response, contained
        within a [`Headers`](../../Headers/Headers.mdx) object or object literal of
        [`String`](../../String/String.mdx) key/value pairs.

### Return value

Always returns `undefined`.

### Examples

```js
event.sendEarlyHints({ link: '</style.css>; rel=preload; as=style' });

event.sendEarlyHints([
        ['link', '</style.css>; rel=preload; as=style'],
        ['link', '</style2.css>; rel=preload; as=style']
    ]);
```
