Laravel 5和怪异的bug:背面花括号 [英] Laravel 5 and weird bug: curly braces on back

问题描述

每当我在Laravel网站上回顾历史时，就会看到这样的答复:

Whenever I go back in history on my Laravel website, the response I see is this:

{}

当我回到之前的位置时，它也显示了那些大括号.

When I go forward to where I was before that, it shows those braces as well.

如果我在具有禁用缓存"选项的Chrome中启动开发人员工具，则不会发生此问题.返回的Content-Type实际上是application/json.在Firefox中没有这种问题.

The problem doesn't occur if I launch Developer Tools in Chrome with Disable Cache option. The Content-Type of what's returned is indeed application/json. In Firefox there's no such problem.

发生这种情况是因为我的中间件之一.我编写了AjaxJson中间件，将所有Ajax请求转换为JSON响应.奇怪的是，当我回顾历史时，Google Chrome发出了Ajax的请求.它包含以下标头:

It happens because one of my Middlewares. I wrote AjaxJson middleware to translate all Ajax requests to JSON response. Weirdly, when I go back in history, Google Chrome makes this request Ajax. It contains this header:

X-Requested-With:XMLHttpRequest

X-Requested-With: XMLHttpRequest

因此$request->ajax()返回true.

这是我的中间件:

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Response;

class AjaxJson
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $response = $next($request);

        if (!$request->ajax()) {
            return $response;
        }

        if (!$response instanceof Response) {
            return $response;
        }

        return response()->json($response->getOriginalContent(), $response->status());
    }
}

我在做什么错了?

我发现有关Cache-Control响应头的no-store值.单击后退按钮时，它可防止Chrome使用缓存.我创建了一个中间件来设置Cache-Control这样:

I found out about no-store value for Cache-Control response header. It prevents Chrome from using cache when clicking back button. I created a middleware to set Cache-Control like this:

缓存控制:私有，最大年龄= 0，无缓存，无存储

Cache-Control: private, max-age=0, no-cache, no-store

如果您知道解决此问题的更好方法，请告诉我.

Please let me know guys, if you know better way of solving this problem.

推荐答案

尝试在验证后处理请求:

Try to process the request after validations:

public function handle($request, Closure $next)
{
    if ($request->ajax()) {
        return response()->json($response->getOriginalContent(), $response->status());
    }

    return $next($request);        
}

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