服务器A请求服务器B的接口，那么一般会出现跨域问题。全解跨域请求处理办法
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' istherefore 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: *' ```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 AppHttpMiddleware;
use Closure;
use IlluminateSupportFacadesAuth;
class AccessControlAllowOrigin
{
/**
*
* Handle an incoming request.
*
* @param IlluminateHttpRequest $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 AppHttp;
use IlluminateFoundationHttpKernel 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 = [
IlluminateFoundationHttpMiddlewareCheckForMaintenanceMode::class,
IlluminateFoundationHttpMiddlewareValidatePostSize::class,
AppHttpMiddlewareTrimStrings::class,
IlluminateFoundationHttpMiddlewareConvertEmptyStringsToNull::class,
AppHttpMiddlewareAccessControlAllowOrigin::class,
];
/**
* The application's route middleware groups.
*
* @var array
*/
protected $middlewareGroups = [
'web' => [
AppHttpMiddlewareEncryptCookies::class,
IlluminateCookieMiddlewareAddQueuedCookiesToResponse::class,
IlluminateSessionMiddlewareStartSession::class,
// IlluminateSessionMiddlewareAuthenticateSession::class,
IlluminateViewMiddlewareShareErrorsFromSession::class,
AppHttpMiddlewareVerifyCsrfToken::class,
IlluminateRoutingMiddlewareSubstituteBindings::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' => IlluminateAuthMiddlewareAuthenticate::class,
'auth.basic' => IlluminateAuthMiddlewareAuthenticateWithBasicAuth::class,
'bindings' => IlluminateRoutingMiddlewareSubstituteBindings::class,
'can' => IlluminateAuthMiddlewareAuthorize::class,
'guest' => AppHttpMiddlewareRedirectIfAuthenticated::class,
'throttle' => IlluminateRoutingMiddlewareThrottleRequests::class,
'cors' => AppHttpMiddlewareAccessControlAllowOrigin::class,
];
}
第四步：在路由中添加路由
Route::middleware('cors')->group(function () {
//
});