wp-includes/class-wp-http-requests-response.php:87Sets all header values.
$headersarray public function set_headers( $headers ) { $this->response->headers = new WpOrg\Requests\Response\Headers( $headers ); }Introduced in 4.6.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-http-requests-response.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.