Locator::is_feed( SimplePie\HTTP\Response $file, bool $check_html = false ): bool

165    public function is_feed(Response $file, bool $check_html = false)166    {167        assert($this->registry !== null);168 169        if (Misc::is_remote_uri($file->get_final_requested_uri())) {170            $sniffer = $this->registry->create(Content\Type\Sniffer::class, [$file]);171            $sniffed = $sniffer->get_type();172            $mime_types = ['application/rss+xml', 'application/rdf+xml',173                                'text/rdf', 'application/atom+xml', 'text/xml',174                                'application/xml', 'application/x-rss+xml'];175            if ($check_html) {176                $mime_types[] = 'text/html';177            }178 179            return in_array($sniffed, $mime_types);180        } elseif (is_file($file->get_final_requested_uri())) {181            return true;182        } else {183            return false;184        }185    }