HttpClient订阅的响应标头未定义 [英] HttpClient Subscribed Response Headers Undefined

问题描述

有人能给我任何原因，为什么我从http.post返回响应时却没有任何标题?

can anyone give me any reasons on why I'm not getting any headers when getting a response back from http.post?

this.http.post<Response>(url, body).subscribe((res: Response) => console.log(res.headers));

res.headers记录为未定义"，但是在Chrome DevTools中，响应显示了我要查找的标题.

res.headers logs 'undefined', however in Chrome DevTools, the response is showing the headers I'm looking for.

侧面说明:我确实将Access-Control-Expose-Headers设置为我要公开的标头.

Side note: I do have Access-Control-Expose-Headers set to the header I'm wanting to expose.

知道为什么会这样吗?

推荐答案

观察响应，而不是类型转换的正文，默认情况下，较新的HttpClient会这样做:

To observe a response instead of a typecasted body, which the newer HttpClient does by default:

this.http.post(url, data, {observe: 'response'}).subscribe((res:Response) => {});

即.您所做的只是键入强制转换服务器以<Response>发送的数据.

Ie. what you were doing was just type casting the data your server sent as <Response>.

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