java – Android：从应用程序中的多个活动访问单个数据库？

Laravel 5.4 api 允许跨域访问

Laravel 5.4 api 允许跨域访问

需求: SPA单页应用请求接口, 报错

XMLHttpRequest cannot load http://api.console.vms3.com/api/user. No ''Access-Control-Allow-Origin'' header is present on the requested resource. Origin ''http://localhost:8080'' is therefore not allowed access.

意思就是服务器响应不允许跨域访问.

那我们就需要让服务器支持跨域访问, 也就是在响应头部中添加

''Access-Control-Allow-Origin: *''

文本使用Laravel 5.4版本

第一步: 创建中间件

创建 `app/Http/Middleware/AccessControlAllowOrigin.php` middleware 把 ''Access-Control-Allow-Origin: *'' 写入头部.

app/Http/Middleware/AccessControlAllowOrigin.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Support\Facades\Auth;

class AccessControlAllowOrigin
{
    /**
     *
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        header(''Access-Control-Allow-Origin: *'');
        header("Access-Control-Allow-Credentials: true");
        header("Access-Control-Allow-Methods: *");
        header("Access-Control-Allow-Headers: Content-Type,Access-Token");
        header("Access-Control-Expose-Headers: *");

        return $next($request);
    }

}

第二步: 注册路由

注册这个 middleware 到 kernel 中. 
分别在 protected $middleware  数组中和 protected $routeMiddleware 数组中
添加我们刚才创建的那个文件class名, 使用 `cors` 这个别名.

第三步: 设置中间件保护接口

然后在设置它保护 api , 就是$middlewareGroups[''api''] 的数组中添加它的别名, 本文中是 ''cors''

app/Http/Kernel.php

<?php

namespace App\Http;

use Illuminate\Foundation\Http\Kernel as HttpKernel;

class Kernel extends HttpKernel
{
    /**
     * The application''s global HTTP middleware stack.
     *
     * These middleware are run during every request to your application.
     *
     * @var array
     */
    protected $middleware = [
        \Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode::class,
        \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,
        \App\Http\Middleware\TrimStrings::class,
        \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,
        \App\Http\Middleware\AccessControlAllowOrigin::class,
    ];

    /**
     * The application''s route middleware groups.
     *
     * @var array
     */
    protected $middlewareGroups = [
        ''web'' => [
            \App\Http\Middleware\EncryptCookies::class,
            \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
            \Illuminate\Session\Middleware\StartSession::class,
            // \Illuminate\Session\Middleware\AuthenticateSession::class,
            \Illuminate\View\Middleware\ShareErrorsFromSession::class,
            \App\Http\Middleware\VerifyCsrfToken::class,
            \Illuminate\Routing\Middleware\SubstituteBindings::class,
        ],

        ''api'' => [
            ''throttle:60,1'',
            ''bindings'',
            ''cors''
        ],
    ];

    /**
     * The application''s route middleware.
     *
     * These middleware may be assigned to groups or used individually.
     *
     * @var array
     */
    protected $routeMiddleware = [
        ''auth'' => \Illuminate\Auth\Middleware\Authenticate::class,
        ''auth.basic'' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
        ''bindings'' => \Illuminate\Routing\Middleware\SubstituteBindings::class,
        ''can'' => \Illuminate\Auth\Middleware\Authorize::class,
        ''guest'' => \App\Http\Middleware\RedirectIfAuthenticated::class,
        ''throttle'' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
        ''cors'' => \App\Http\Middleware\AccessControlAllowOrigin::class,
    ];
}

Laravel 5.x设置跨域访问

做api接口的时候碰到个问题，跨域！
解决方法有很多，但是方便的依旧那么一两个，这里我就介绍我最会的就是以下这种

最方便的，新建一个middleWare,把这个middleware加入到全局中间件，所有的请求，都会经过这个中间件的过滤。

php artisan make:middleware CrossHttp

然后就会在appHttpMiddlewareCrossHttp.php这个中间件，在handle方法里面添加如下代码：

public function handle($request, Closure $next) {
        $response = $next($request);
        $response->header(''Access-Control-Allow-Origin'', ''*'');
        $response->header(''Access-Control-Allow-Headers'', ''Origin, Content-Type, Cookie, Accept'');
        $response->header(''Access-Control-Allow-Methods'', ''GET, POST, PATCH, PUT, OPTIONS'');
       $response->header(''Access-Control-Allow-Credentials'', ''true'');  //ession共享的需求才用到
        return $response;
    }
   
 

这个*意思就是允许所有域名来访问这个接口。
到这里还没完，中间件建立了，我们还要加到appHttpKernel.php里面去，不然不能生效。

Laravel 52 $errors 不正常工作 laravel 5 教程 laravel开发教程 laravel怎么

as of 5.2, routes.php is by default already called in the context of a [‘middleware’=>’web’] by routeserviceprovider. but in routes.php default generation of auth routes, the route::group call is still happening by default - so if you delete that route::group declaration from routes.php the application then correctly shows errors.

http://stackoverflow.com/questions/34438463/laravel-5-2-errors-not-appearing-in-blade/36253445#36253445?newreg=d2be163070544c9faa15d63a39c84a21

以上就介绍了Laravel 52 $errors 不正常工作，包括了laravel,error方面的内容，希望对PHP教程有兴趣的朋友有所帮助。

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