laravel报错Call to undefined method Symfony\Component\HttpFoundation\BinaryFileResponse::header()

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在中间件中使用了

$response->header('Access-Control-Allow-Origin', '*');$response->header('Access-Control-Allow-Headers', 'Origin, Content-Type, Cookie, X-CSRF-TOKEN, Accept, Authorization, X-XSRF-TOKEN');$response->header('Access-Control-Expose-Headers', 'Authorization, authenticated');$response->header('Access-Control-Allow-Methods', 'GET, POST, PATCH, PUT, OPTIONS');$response->header('Access-Control-Allow-Credentials', 'true');

所以在使用laravel-excel做excel导出的时候，使用下载，报Call to undefined method Symfony\Component\HttpFoundation\BinaryFileResponse::header()这个错误。

看了laravel文档，说下载文件用

return response()->download($pathToFile);
return response()->download($pathToFile, $name, $headers);
return response()->download($pathToFile)->deleteFileAfterSend(true);

看来下源码，是用的这个

 public function download($export, string $fileName, string $writerType = null, array $headers = []){return response()->download($this->export($export, $fileName, $writerType)->getLocalPath(),$fileName,$headers)->deleteFileAfterSend(true);}

然后网上看了下，说原因是

$response是Illuminate\Http\Response类的一个实例，而Passport实际上使用的是Symfony\Component\HttpFoundation\Response类响应消息

通过查看源码，发现

Illuminate\Http\Response使用了Illuminate\Http\ResponseTrait，而header就是在这里定义的

public function header($key, $values, $replace = true){$this->headers->set($key, $values, $replace);return $this;}

再查看Symfony\Component\HttpFoundation\Response的源码，发现，里面的header是这样的

$this->headers = new ResponseHeaderBag($headers);

查看use Symfony\Component\HttpFoundation\HeaderBag;的源码，这里是处理header的一个类，而Illuminate\Http\ResponseTrait在处理header时也是用的这个，

public function withHeaders($headers){if ($headers instanceof HeaderBag) {$headers = $headers->all();}foreach ($headers as $key => $value) {$this->headers->set($key, $value);}return $this;}

 

所以从上面的代码看出，我们可以直接使用

$this->headers->set($key, $values, $replace);

那么在中间件中就可以这样用

$response->headers->set('Access-Control-Allow-Origin', '*');$response->headers->set('Access-Control-Allow-Headers', 'Origin, Content-Type, Cookie, X-CSRF-TOKEN, Accept, Authorization, X-XSRF-TOKEN');$response->headers->set('Access-Control-Expose-Headers', 'Authorization, authenticated');$response->headers->set('Access-Control-Allow-Methods', 'GET, POST, PATCH, PUT, OPTIONS');$response->headers->set('Access-Control-Allow-Credentials', 'true');

 

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