如何从Angular 2响应中获取所有标题？ [英] How to get all the headers from an Angular 2 response?

问题描述

我在Chrome开发工具中看到的响应标题与Angular 2的响应标题不匹配显示在Chrome控制台中。

< img src =https://i.stack.imgur.com/hgVtC.pngalt =只显示内容类型>

只Content-Type头部在执行后显示：

  this.http.get（tempUrl）.map（res => ; {
 console.log（csrf received）; 
 console.log（res）; 
}）
  

解决方案

默认情况下只显示一些安全标题列表（以JavaScript表示）。这是出于安全原因。这个列表如下：

• 缓存控制


• 内容语言


• 内容类型


• 过期


• 上次修改


• Pragma

为了公开其他头文件，服务器应该发送访问控制头 Access-Control-Expose-Headers ，列出所有想要公开的头文件。

  Access-Control-Expose-Headers：Content-Length，X-CSRF-令牌
  

The response headers I see in Chrome Dev tools don't match the ones that Angular 2 is showing in the Chrome console.

Only the Content-Type header is showing up after having executed:

this.http.get(tempUrl).map(res=>{
      console.log("csrf received");
      console.log(res);
})

解决方案

Only a certain list of "safe" headers are exposed by default (to Javascript). This is for security reasons. This list is as follows

• Cache-Control
• Content-Language
• Content-Type
• Expires
• Last-Modified
• Pragma

In order to expose other headers, the server should send the access control header Access-Control-Expose-Headers, listing all the headers it wants to expose.

Access-Control-Expose-Headers: Content-Length, X-CSRF-Token

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