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                我們在用 laravel 進行開發的時候,特別是前后端完全分離的時候,由于前端項目運行在自己機器的指定端口(也可能是其他人的機器) , 例如 localhost:8000 , 而 laravel 程序又運行在另一個端口,這樣就跨域了,而由于瀏覽器的同源策略,跨域請求是非法的。其實這個問題很好解決,只需要添加一個中間件就可以了。 新建一個中間件 ~~~ php artisan make:middleware EnableCrossRequestMiddleware ~~~ 書寫中間件內容 ~~~ <?php namespace App\Http\Middleware; use Closure; class EnableCrossRequestMiddleware { /** * Handle an incoming request. * * @param \Illuminate\Http\Request $request * @param \Closure $next * @return mixed */ public function handle($request, Closure $next) { $response = $next($request); $origin = $request->server('HTTP_ORIGIN') ? $request->server('HTTP_ORIGIN') : ''; $allow_origin = [ 'http://localhost:8000', ]; if (in_array($origin, $allow_origin)) { $response->header('Access-Control-Allow-Origin', $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'); } return $response; } } ~~~ $allow_origin 數組變量就是你允許跨域的列表了,可自行修改。 然后在內核文件注冊該中間件 ~~~ protected $middleware = [ // more App\Http\Middleware\EnableCrossRequestMiddleware::class, ]; ~~~ 在 App\Http\Kernel 類的 $middleware 屬性添加,這里注冊的中間件屬于全局中間件。 然后你就會發現前端頁面已經可以發送跨域請求了。 會多出一次 method 為 options 的請求是正常的,因為瀏覽器要先判斷該服務器是否允許該跨域請求。
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