how do I force a download from API?

Long story short, I have an API that creates a temporary Zip file and I want to force it to download.

I am sure that I'm missing something. APIs are new to me.
The API works, it creates the file ok, I just can't force it to download (prompt to download would also be ok) .

This is how I got the Zip to download in a v6.x entry point called from a SugarWidget. How do I do this in v7?
($filename is the path to the file relative to sugar root).






       
   header("Pragma: public");
   header("Cache-Control: maxage=1, post-check=0, pre-check=0");
   header("Content-Type: application/force-download");
   header("Content-type: application/octet-stream");
   header("Content-Disposition: attachment; filename=\"".$display_filename."\";");
   // disable content type sniffing in MSIE
   header("X-Content-Type-Options: nosniff");
   header("Content-Length: " . filesize($filename));
   header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 2592000));
   set_time_limit(0);
   @ob_end_clean();
   ob_start();
   readfile($filename);
   @ob_flush();
   @unlink($filename);
                           


thanks,
FrancescaS

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