XmlHttpRequest getAllResponseHeaders（）不返回所有标头 [英] XmlHttpRequest getAllResponseHeaders() not returning all the headers

问题描述

我正在尝试从ajax请求中获取响应标头，但jQuery的getAllResponseHeaders xhr方法仅显示 Content-Type标头。有人知道为什么吗？

I'm trying to get the response headers from an ajax request but jQuery's getAllResponseHeaders xhr method only displays the "Content-Type" header. Anyone know why?

这是响应标头

Access-Control-Allow-Credentials：true

Access-Control-Allow-标头：如果自修改，缓存控制，内容类型，保持活动，X请求使用，授权

Access-Control-Allow-方法：GET，PUT，POST，DELETE，OPTIONS

Access-Control-Allow-Origin：*

Access-Control-Max-Age：1728000

授权：apikey = apikey1 AuthenticationToken = 62364GJHGJHG

连接：keep-alive

内容长度：240

内容类型：application / json ; charset = utf-8

X-Powered-By：Express

This is the response header
Access-Control-Allow-Credentials:true
Access-Control-Allow-Headers:If-Modified-Since, Cache-Control, Content-Type, Keep-Alive, X-Requested-With, Authorization
Access-Control-Allow-Methods:GET, PUT, POST, DELETE, OPTIONS
Access-Control-Allow-Origin:*
Access-Control-Max-Age:1728000
Authorization:apikey="apikey1" AuthenticationToken="62364GJHGJHG"
Connection:keep-alive
Content-Length:240
Content-Type:application/json; charset=utf-8
X-Powered-By:Express

这是成功函数

params.success = function (response, textStatus, jqXHR) {
  console.log(jqXHR.getAllResponseHeaders())
}

这就是它的记录...

内容类型：application / json; charset = utf-8

This is what it logs...
Content-Type: application/json; charset=utf-8

推荐答案

刚刚遇到了这个问题。这是因为您正在执行CORS请求，并且没有公开Location标头。

Just ran into this. It's because you're doing a CORS request and you're not exposing the Location header.

您需要添加 Access-Control-Expose -Headers 到Express中您的飞行前CORS响应：

You need to add a Access-Control-Expose-Headers to your preflight CORS response in Express:

res.header('Access-Control-Expose-Headers', 'Content-Type, Location');
res.send(200);

这将解决问题。

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