谷歌浏览器未设置从NodeJS / Express服务器发送的Cookie

我正在尝试在后端（带有Express-Session的Express / Node / Mongo）中设置经过身份验证的端点，并且可以在响应标头中将Cookie发送到客户端（Chrome版本53.0.2785.143），但是当我在开发控制台在“应用程序”->“存储”->“ Cookies”->“ http：// localhost：8100”下不存在，因此在后续的“请求标头”中没有任何内容发送回服务器。但是，当我测试使用Postman编写的代码时，似乎一切正常，这意味着服务器在登录时发送一个cookie，并且当我获取经过身份验证的终结点时该cookie被返回。

Response Headers
HTTP/1.1 200 OK
X-Powered-By: Express
Vary: X-HTTP-Method-Override
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: DELETE, PUT, GET
Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept
Content-Type: application/json; charset=utf-8
Content-Length: 1258
ETag: W/"4ea-X9Q0hp8ptccLVapzMZamYA"
set-cookie: connect.sid=s%3AyEaCZPUtH-rA0yQ3Osk-FNBHxQNYbFqp.gvwe%2FO0GSSfaX6i8Y29XD9vEo6ht2M%2FqL00wiFpntnU; Path=/
Date: Tue, 25 Oct 2016 01:28:59 GMT
Connection: keep-alive

Request Headers
POST /login HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Content-Length: 51
Pragma: no-cache
Cache-Control: no-cache
Origin: http://localhost:8100
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36
Content-Type: application/json
Accept: */*
Referer: http://localhost:8100/
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.8

Request Payload
{"email":"[email protected]","password":"test123"}

Settings object for the session ID cookie:
{ path: '/', _expires: null, originalMaxAge: null, httpOnly: false }

session ID cookie name = 'connect.sid'.

Ionic2 service to login user.
public loginUser(user:Object):Observable<any>{
    let headers = new Headers();
    headers.append('Content-Type', 'application/json');
    return this.http.post('http://localhost:8000/login', JSON.stringify(user), {headers: headers})
            .map(this.extractData)
            .catch(this.handleError)
}

public extractData(res: Response) {
    console.log(res.headers); //cookie does not log here in response
    let body = res.json();
    return body || { };
}