如何找出一个请求是否是一个ajax请求?

问题描述

我尝试确定ajax是否发送了对PHP文件的请求.

我用它搜索了一下，并阅读了很多建议采用以下方法的文章:

I googled it and read a whole a bunch of articles that suggest following method:

if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && !empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
    echo 'This is an ajax request!';
    exit;
}
echo 'This is not an ajax request!';

但是我的服务器没有此变量:未定义索引:HTTP_X_REQUESTED_WITH ...

But my server doesn't have this variable: Undefined index: HTTP_X_REQUESTED_WITH ...

这就是我发出ajax请求的方式:

Thats how I make the ajax request:

$.ajax({
    url: 'http://URL/test.php',
    complete: function(res) {
        console.log(res.responseText);
    }
});

我正在从其他网址拨打电话，因此我设置了 header('Access-Control-Allow-Origin:*');

I'm making that call from a different url, so I've set header('Access-Control-Allow-Origin: *');

我在 $ _ SERVER 中发现了一个区别:

I have discovered one difference in $_SERVER though:

Ajax请求: $ _ SERVER [HTTP_ACCEPT] =>*/*

无Ajax请求: $ _ SERVER [HTTP_ACCEPT] =>text/html，application/xhtml + xml，application/xml; q = 0.9，image/webp，*/*; q = 0.8

所以我的问题是，我是否可以将 HTTP_X_REQUESTED_WITH 放入 $ _ SERVER 中?如果不是，是否有适当的方法通过使用 $ _ SERVER [HTTP_ACCEPT]

So my question is, is there a way for me to get HTTP_X_REQUESTED_WITH into $_SERVER?And if not, is there a proper way to find out if the request is AJAX by using the $_SERVER[HTTP_ACCEPT]

推荐答案

没有100％的方法来检测请求是否通过ajax发出.即使有人使用"X-Requested-With:XMLHttpRequest"发送标头，您也不应依赖它.

There's no 100% way to detect if the request was made via ajax. Even if someone sends header with "X-Requested-With: XMLHttpRequest" you shouldn't rely on it.

这篇关于如何找出一个请求是否是一个ajax请求?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！