ajax 跨域 yii无法检测出是ajax请求

群里面的哥们发现的问题

yii request对象的 isAjax 方法无法正常工作（yii1.x 但猜想yii2 一样的）。

最后说其是使用的跨域调用 。

经验证确实ajax跨域时 没有发送X-Requested-With 头

在stackoverflow 上有这个问题的解决方案：

If you are using jQuery to do your ajax request, it will not send the header X-Requested-With (HTTP_X_REQUESTED_WITH) = XMLHttpRequest, because it is cross domain. But there are 2 ways to fix this and send the header:

Option 1) Manually set the header in the ajax call:

$.ajax({
     url: "http://your-url...",
 headers: {'X-Requested-With': 'XMLHttpRequest'}
});  

Option 2) Tell jQuery not to use cross domain defaults, so it will keep the X-Requested-With header in the ajax request:

$.ajax({
  url: "http://your-url...",
 crossDomain: false
});

But with this, the server must allow those headers, then the server needs to print those headers:

print "Access-Control-Allow-Origin: *\n";
print "Access-Control-Allow-Headers: X-Requested-With, Content-Type\n";

The first line above will avoid the error "Origin is not allowed by Access-Control-Allow-Origin."
The second line will avoid the error "Request header field X-Requested-With is not allowed by Access-Control-Allow-Headers."

原始问题地址cross-domain-ajax-doesnt-send-x-requested-with-header

php 端跨域改造

这个有好多做法 自行搜索

最简单的先在index.php 中加入：

header('Access-Control-Allow-Origin: *');

也可以用白名单过滤 可以添加多行

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