laravel response stream download returns empty file

Question

I have a controller method that receives user's request for download, calls REST API endpoint with the requested body parameters.

API, in return, sends a file.

I am using Guzzle for making API requests and laravel version 5.4.

The content of the $response->getBody()->getContents(); is as :

"""
request_id\ts_sku\tr_product_url\thuman_verdict\n
199\tSG-948\thttps://www.amazon.com/gp/offer-listing/B076CP7J4P?condition=new\tMatch\n
199\tZIB-601\thttps://www.amazon.com/gp/offer-listing/B07D9PN39C?condition=new\tMatch\n
199\tRCM-LG526\thttps://www.amazon.com/gp/offer-listing/B07FDJ3W7P?condition=new\tMatch\n
199\tGSI-335\thttps://www.amazon.com/gp/offer-listing/B07GNX1VSG?condition=new\tMatch\n
199\tZIB-489\thttps://www.amazon.com/gp/offer-listing/B07D9RCGXM?condition=new\tMatch\n
"""

Also the received header response from API is:

Content-Type : ('text/tab-separated-values', none)
Content-Disposition : attachment; filename=/path/to/file1.tsv

I am trying to receive this file in my controller and return response as stream download to user's browser.

Here's controller method:

    $client = new Client(["base_uri" => $this->apiBaseUrl]);
    $url = 'download/filterdownload/';

    try {
        $response = $client->request('POST', $url, ['headers'=>['Content-Type' => 'application/json'], 'body'=>json_encode($filterArr)]);
        # $resArr = json_decode($response, true);
    } catch (\Exception $e) {
        return redirect()->back()->with('error', $e->getMessage());
    }

    if(!empty($resArr) && array_key_exists('response', $resArr))
        return redirect()->back()->with('error', $resArr['response']);

    # return response
    $file = $response->getBody()->getContents();

    $file_name = $filterArr['client_name'].'_'.Carbon::now()->toDateString().'.tsv';
    $headers = [
        'Content-Disposition' => 'attachment; filename='. $file_name. ';'
    ];
    return response()->stream(function () {
        $file;
    }, 200, $headers);

This downloads a file but the file is empty.

Answer 1

Maybe help:

 # return response
    $file = $response->getBody()->getContents();

    $file_name = $filterArr['client_name'].'_'.Carbon::now()->toDateString().'.tsv';
    $headers = [
        'Content-Disposition' => 'attachment; filename='. $file_name. ';'
    ];
    return response()->stream(function () use ($file)  { <-- edit
        $file;
    }, 200, $headers);