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index.md
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---
title: Early-Data
slug: Web/HTTP/Headers/Early-Data
page-type: http-header
status:
- experimental
browser-compat: http.headers.Early-Data
---
{{SeeCompatTable}}{{HTTPSidebar}}
The **`Early-Data`** header is set by
an intermediary to indicate that the request has been conveyed in [TLS early data](/en-US/docs/Web/Security/Transport_Layer_Security#tls_1.3),
and also indicates that the intermediary understands the {{HTTPStatus("425", "425 (Too Early)")}} status code.
The `Early-Data` header is **not** set by the originator of the
request (i.e., a browser).
<table class="properties">
<tbody>
<tr>
<th scope="row">Header type</th>
<td>{{Glossary("Request header")}}</td>
</tr>
<tr>
<th scope="row">{{Glossary("Forbidden header name")}}</th>
<td>no</td>
</tr>
</tbody>
</table>
## Syntax
```http
Early-Data: 1
```
## Examples
```http
GET /resource HTTP/1.0
Host: example.com
Early-Data: 1
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}