React Native中Fetch API设置redirect:'manual'无法捕获重定向

我在React Native项目里使用Fetch API发送携带用户名和密码的HTTP POST登录请求。登录成功后，服务器会在Login页面设置会话Cookie，随后重定向至Blog页面。但Fetch API接收到的是Blog页面的响应，其中并不包含会话Cookie，因此我需要在重定向发生前捕获它并存储会话Cookie。

根据文档说明，设置redirect: 'manual'应该可以实现该功能，但我仍获取到最终页面的响应，Fetch API未识别到重定向——response.redirected返回undefined，不过请求URL与响应URL确实不同。请问可能是什么原因导致的？

相关代码 #

const url = 'url of a website ( cannot show it to you )';
// login request
const login = (profileName, password) => {
  const details = {
    benutzername: profileName,
    passwort: password,
  };

  const formBody = Object.keys(details)
    .map((key) => `${encodeURIComponent(key)}=${encodeURIComponent(details[key])}`)
    .join('&');

  console.log(`formBody to be sent: ${formBody}`);

  fetch(url, {
    method: 'POST',
    headers: {
      Accept:
        'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7',
      'Content-Type': 'application/x-www-form-urlencoded',
    },
    body: formBody,
    redirect: 'manual',
  })
    .then((response) => {
      console.log('! response type !');
      console.log(response.type);
      console.log('! is redirected !');
      console.log(response.redirected);
      console.log('! response console log !');
      console.log(response.url);
      console.log('! response status console log !');
      console.log(response.status);
      return response.headers;
    })
    .then((headers) => {
      console.log('! headers for each !');
      headers.forEach((value, key) => {
        console.log(`${key} ==> ${value}`);
      });
      return headers;
    })
    .catch((error) => console.log(`error: ${error}`));
};

export { login };

浏览器网络活动截图 #

• Login页面网络活动：
• Blog页面网络活动：

日志信息 #

LOG  ! response type !
 LOG  default
 LOG  ! is redirected !
 LOG  undefined
 LOG  ! response console log !
 LOG  https://.../Blog.xhtml?faces-redirect=true&dswid=-8890
 LOG  ! response status console log !
 LOG  200
 LOG  ! headers for each !
 LOG  cache-control ==> no-cache, no-store, must-revalidate
 LOG  content-encoding ==> gzip
 LOG  content-type ==> text/html;charset=UTF-8
 LOG  date ==> Sun, 23 Jul 2023 14:54:59 GMT
 LOG  expires ==> 0
 LOG  pragma ==> no-cache
 LOG  server ==> Apache
 LOG  set-cookie ==> dsrwid--8890=-8890; path=/; secure; Max-Age=60; Expires=Sun, 23-Jul-2023 14:55:59 GMT; SameSite=None
 LOG  vary ==> Accept-Encoding

内容的提问来源于stack exchange，提问作者user22272238