wp-includes/php-ai-client/src/Providers/Http/Collections/HeadersCollection.php:128Returns a new instance with the specified header.
$namestring$valuestring|WordPress\AiClient\Providers\Http\Collections\list<string>self public function withHeader(string $name, $value): self { $new = clone $this; $new->set($name, $value); return $new; }Introduced in 0.1.0. Unchanged from 7.0.4 through 7.1.0.
Signature, return type and hooks compared across 2 parsed releases.
src/wp-includes/php-ai-client/src/Providers/Http/Collections/HeadersCollection.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.