---
title: add
summary: null
url: https://www.fastly.com/documentation/reference/vcl/statements/add
---

**Available in:** all subroutines

Appends an HTTP header to a request or response object.

```vcl
add resp.http.Set-Cookie = "myCookie=foo; path=/; SameSite=Strict; Secure; max-age=60";
```

If the header already exists, another with the same name is appended to the same request, and the existing header remains in place. The `add` statement is commonly used to add `Set-Cookie` headers, where it is important not to override any other `Set-Cookie` headers that might already be in the response.

If you prefer to replace any existing header value, use `set` instead.