Laravel中的BinaryFileResponse未定义

Question

我有以下问题:我想在路由上返回一个Image/getImage/{id}该函数如下所示:

public function getImage($id){
   $image = Image::find($id);
   return response()->download('/srv/www/example.com/api/public/images/'.$image->filename);
}

当我这样做时它返回给我:

FatalErrorException in HandleCors.php line 18:
Call to undefined method Symfony\Component\HttpFoundation\BinaryFileResponse::header()

我有use Response;控制器的开头.我不认为HandleCors.php是问题,但无论如何:

<?php namespace App\Http\Middleware;
use Closure;

use Illuminate\Contracts\Routing\Middleware;
use Illuminate\Http\Response;

class CORS implements Middleware {

public function handle($request, Closure $next)
{
      return $next($request)->header('Access-Control-Allow-Origin' , '*')
            ->header('Access-Control-Allow-Methods', 'POST, GET, OPTIONS, PUT, DELETE')
            ->header('Access-Control-Allow-Headers', 'Content-Type, Accept, Authorization, X-Requested-With, Application');
     }
}

我实际上不知道为什么会发生这种情况,因为它与Laravel Docs中描述的完全相同.我收到错误后更新了Laravel,但这并没有解决它.

Answer 1

问题是你正在调用->header()一个Response没有该函数的对象(Symfony\Component\HttpFoundation\BinaryFileResponse该类).该->header()函数是Laravel的Response类使用的特征的一部分,而不是基本的Symfony Response.

幸运的是,您可以访问该headers属性,因此您可以这样做:

$response = $next($request);

$response->headers->set('Access-Control-Allow-Origin' , '*');
$response->headers->set('Access-Control-Allow-Methods', 'POST, GET, OPTIONS, PUT, DELETE');
$response->headers->set('Access-Control-Allow-Headers', 'Content-Type, Accept, Authorization, X-Requested-With, Application');

return $response;

Answer 2

您可能希望file通过检查header返回的Closure.

文件下载请求通常会从 中header省略该方法Closure。

public function handle($request, Closure $next)
{
    $handle = $next($request);

    if(method_exists($handle, 'header'))
    {
        $handle->header('Access-Control-Allow-Origin' , '*')
               ->header('Access-Control-Allow-Methods', 'POST, GET, OPTIONS, PUT, DELETE')
               ->header('Access-Control-Allow-Headers', 'Content-Type, Accept, Authorization, X-Requested-With, Application');
    }

    return $handle;
    
}

如果您需要为file请求设置标头（如其他答案所建议的那样）$handle->headers->set()可以在else条件中使用：

public function handle($request, Closure $next)
{
    $handle = $next($request);

    if(method_exists($handle, 'header'))
    {
        // Standard HTTP request.

        $handle->header('Access-Control-Allow-Origin' , '*');

        return $handle;
    }

    // Download Request?

    $handle->headers->set('Some-Other-Header' , 'value')

    return $handle;
    
}