Why is necessary two requests to transfer the file? - php

Question

I have this method below to download a file from an API server. But its not working properly, when the user clicks in the button that calls the getFile() method it appears at first in the page the error
Trying to get property of non-object
But if the user click in the browser refresh button the file is downloaded.
So it seems that for the file be generated is necessary send two requests and in the first appears
Trying to get property of non-object
In the second the file is transfered, in the third it appears again
Trying to get property of non-object
In the API says that to download the file is an asynchronous operation, which means that the file may not be ready immediately. I dont know if the issue can be because of that.
Code:
public function getFile($regId){
$client = new \GuzzleHttp\Client();
$user = Auth::user();
$registration = $user->registrations()->with(["proforma"])->where("id", $regId)->first();
$proforma = $registration->proforma->proforma_number;
$getProforma = $client->request('GET', 'https://...'.$proforma.'.json', [
'query' => ['api_key' => '...'],
]);
$response = $getProforma->getBody()->getContents();
$url = null;
if(!empty($response)) {
$response = json_decode($response);
$url = !empty($response->output->pdfUrl) ? $response->output->pdfUrl : '';
}
header("Location: $url");
}

Answer 1

public function getFile($regId)
{
$registration = auth()->user()->registrations()->with(["proforma"])->where("id", $regId)->first();
$proforma = $registration->proforma->proforma_number;
$getProforma = json_decode(file_get_contents('https://...' . $proforma . '.json?api_key=.....'));
// $getProforma->output here was your problem so I advice you to: dd($getProforma);
$url = ! empty(optional($getProforma->output)->pdfUrl) ? optional($getProforma->output)->pdfUrl : '/'; // it will redict home if it couldn't find the PDF URL
return redirect($url);
}