从Slim Framework下载文件时出现问题

Question

I want to download file through Slim Framework (The reason why I'm using Slim Framework is because I want to write a simple REST API). I found this post: Download file from Slim Framework 2.4 and this post: http://help.slimframework.com/discussions/questions/359-file-download. I followed the method. Here is my code:

$app->get('/download/:id', 'authenticate', function($id) use ($app)
{    
    $log = '../download/'.$id.'/myfile.zip';

    $res = $app->response()->headers();
    $res['Content-Description'] = 'File Transfer';
    $res['Content-Type'] = 'application/octet-stream';
    $res['Content-Disposition'] ='attachment; filename=' . basename($log);
    $res['Content-Transfer-Encoding'] = 'binary';
    $res['Expires'] = '0';
    $res['Cache-Control'] = 'must-revalidate';
    $res['Pragma'] = 'public';
    $res['Content-Length'] = filesize($log);

    readfile($log);    

    // NOTE: 
//        $response = array();
//        $response["error"] = false;
//        echoRespnse(200, $response);

});

I'm using the Google Chrome's Advanced Rest Client application to test. The problem is the browser hung after the file downloaded.If I comments out the NOTE part in my source code, the browser won't hang again. But I got a "Unexpected token P" error.

Can anybody help? Thanks.

Answer 1

Try the solution here: PHP readfile() adding extra bytes to downloaded file.

You lack the calls to ob_clean, flush and exit.

The problem might be becasue of extra characters output with the rest of the file contents.