Source

File: wp-includes/class-wp-http-requests-response.php

public function get_cookies() {
		$cookies = array();
		foreach ( $this->response->cookies as $cookie ) {
			$cookies[] = new WP_Http_Cookie(
				array(
					'name'      => $cookie->name,
					'value'     => urldecode( $cookie->value ),
					'expires'   => isset( $cookie->attributes['expires'] ) ? $cookie->attributes['expires'] : null,
					'path'      => isset( $cookie->attributes['path'] ) ? $cookie->attributes['path'] : null,
					'domain'    => isset( $cookie->attributes['domain'] ) ? $cookie->attributes['domain'] : null,
					'host_only' => isset( $cookie->flags['host-only'] ) ? $cookie->flags['host-only'] : null,
				)
			);
		}

		return $cookies;
	}