修改 app\Http\Middleware\VerifyCsrfToken.php 内容：

<?php namespace App\Http\Middleware;

use Closure;
use Illuminate\Foundation\Http\Middleware\VerifyCsrfToken as BaseVerifier;

class VerifyCsrfToken extends BaseVerifier {
    //不过滤的 url
    protected $except=array(
        'weixin'
    );
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $_url=$request->decodedPath();
        if(in_array($_url,$this->except)){
            unset($_url);
            // 禁用CSRF
            return $next($request);
        }else{
            unset($_url);
            // 使用CSRF
            return parent::handle($request, $next);
        }
    }

}