Title: Request::withHeader
Published: May 20, 2026

---

# Request::withHeader( string $name, string|WordPressAiClientProvidersHttpDTOlist $value ): self

## In this article

 * [Parameters](https://developer.wordpress.org/reference/classes/wordpress-aiclient-providers-http-dto-request/withheader/?output_format=md#parameters)
 * [Return](https://developer.wordpress.org/reference/classes/wordpress-aiclient-providers-http-dto-request/withheader/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/classes/wordpress-aiclient-providers-http-dto-request/withheader/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/wordpress-aiclient-providers-http-dto-request/withheader/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/classes/wordpress-aiclient-providers-http-dto-request/withheader/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/classes/wordpress-aiclient-providers-http-dto-request/withheader/?output_format=md#wp--skip-link--target)

Returns a new instance with the specified header.

## 󠀁[Parameters](https://developer.wordpress.org/reference/classes/wordpress-aiclient-providers-http-dto-request/withheader/?output_format=md#parameters)󠁿

 `$name`stringrequired

The header name.

`$value`string|<span class="WordPressAiClientProvidersHttpDTOlist”>WordPressAiClientProvidersHttpDTOlistrequired

The header value(s).

## 󠀁[Return](https://developer.wordpress.org/reference/classes/wordpress-aiclient-providers-http-dto-request/withheader/?output_format=md#return)󠁿

 self A new instance with the header.

## 󠀁[Source](https://developer.wordpress.org/reference/classes/wordpress-aiclient-providers-http-dto-request/withheader/?output_format=md#source)󠁿

    ```php
    public function withHeader(string $name, $value): self
    {
        $newHeaders = $this->headers->withHeader($name, $value);
        $new = clone $this;
        $new->headers = $newHeaders;
        return $new;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/php-ai-client/src/providers/http/dto/request.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.0/src/wp-includes/php-ai-client/src/Providers/Http/DTO/Request.php#L243)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/php-ai-client/src/Providers/Http/DTO/Request.php#L243-L249)

## 󠀁[Related](https://developer.wordpress.org/reference/classes/wordpress-aiclient-providers-http-dto-request/withheader/?output_format=md#related)󠁿

| Used by | Description | 
| [ApiKeyRequestAuthentication::authenticateRequest()](https://developer.wordpress.org/reference/classes/wordpress-aiclient-providers-http-dto-apikeyrequestauthentication/authenticaterequest/)`wp-includes/php-ai-client/src/Providers/Http/DTO/ApiKeyRequestAuthentication.php` |

{@inheritDoc}

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/classes/wordpress-aiclient-providers-http-dto-request/withheader/?output_format=md#changelog)󠁿

| Version | Description | 
| [0.1.0](https://developer.wordpress.org/reference/since/0.1.0/) | Introduced. |

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