最后，我选择了这个：

import setCookieParser from 'set-cookie-parser';
import { cookies } from 'next/headers';

export const proxyServerCookies = async (cookieNames: string[], response: Response) => {
    if (response.headers.has('set-cookie')) {
        const cookieString = response.headers.get('set-cookie')!;
        const cookieObject = setCookieParser.parse(setCookieParser.splitCookiesString(cookieString), {
            map: true,
        });

        cookieNames.forEach((cookieName) => {
            if (cookieObject[cookieName]) {
                const cookie = cookieObject[cookieName];

                console.debug(`[API Request] Proxying cookie ${cookieName} to client.`);

                cookies().set(cookieName, cookie.value, {
                    path: cookie.path,
                    domain: cookie.domain,
                    maxAge: cookie.maxAge,
                    sameSite: (cookie.sameSite as 'lax' | 'strict' | 'none' | boolean | undefined),
                    expires: cookie.expires,
                    secure: cookie.secure,
                    httpOnly: cookie.httpOnly,
                });
            }
        });
    }

    return response;
}

字符串
用法如下：

function post<T>(path: string, body: object, _headers?: Record<string, string>, proxyCookies: boolean = false) {
    console.debug(`[API Request] POST ${path}`);

    return fetch(requestUrl(path), {
            method: 'POST',
            credentials: 'include',
            headers: { ..._headers, 'Content-Type': 'application/json' },
            body: JSON.stringify(body)
        })
        .then(proxyServerCookies(['COOKIE_NAME'], response))
        .then(handleResponse<T>);
}

型