wp-includes/class-wp-http-response.php:75Sets all header values.
$headersarray public function set_headers( $headers ) { $this->headers = $headers; }Introduced in 4.4.0. 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-response.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.