Vercel External API cache varys over all header

In my route page, I need fetch some API data from my backend server. For security I must set UserAgent and RequestId to backend. But I found that external API cache only work on refresh, which means I fetch data with totally same headers. When I changed my UserAgent, cache missed. How can I control cache Key exclude some headers?

1'use server';2import ky, { type Options } from 'ky';3import { cookies, headers } from 'next/headers';4import 'server-only';5import checkApiVersion from '../check-api-version';6const original = ky.create({7  credentials: 'omit',8  fetch: (...args) => fetch(...args),9  hooks: {10    beforeRequest: [11      async request => {12        const cookieStore = cookies();13        const header = headers();14        const accessToken =15          process.env.NEXT_PUBLIC_DEV_TOKEN ||16          cookieStore.get('access_token')?.value;17        const mixpanelDistinctId = cookieStore.get('mp_distinct_id')?.value;18        const swimlanes = header.get('swimlanes') || '';19        const userAgent = header.get('user-agent') || '';20        const requestId = header.get('X-Request-Id') || '';21        if (accessToken) {22          request.headers.set('Authorization', `Bearer ${accessToken}`);23        }24        if (mixpanelDistinctId) {25          request.headers.set('X-WB-User-ID', mixpanelDistinctId);26        }27        if (userAgent) {28          request.headers.set('user-agent', userAgent);29        }30        if (swimlanes) {31          request.headers.set('swimlanes', swimlanes);32        }33        if (requestId) {34          request.headers.set('X-Request-Id', requestId);35        }36      },37    ],38  },39});40const Get = <T = unknown>(url: string, options?: Options): Promise<T> => {41  return original.get(checkApiVersion(url), options).json<T>();42};43const Post = <T = unknown>(url: string, options?: Options): Promise<T> => {44  return original.post(checkApiVersion(url), options).json<T>();45};46const Put = <T = unknown>(url: string, options?: Options): Promise<T> => {47  return original.put(checkApiVersion(url), options).json<T>();48};49const Delete = <T = unknown>(url: string, options?: Options): Promise<T> => {50  return original.delete(checkApiVersion(url), options).json<T>();51};52export { Delete, Get, Post, Put };

1'use server';2import ky, { type Options } from 'ky';3import { cookies, headers } from 'next/headers';4import 'server-only';5import checkApiVersion from '../check-api-version';6const original = ky.create({7  credentials: 'omit',8  fetch: (...args) => fetch(...args),9  hooks: {10    beforeRequest: [11      async request => {12        const cookieStore = cookies();13        const header = headers();14        const accessToken =15          process.env.NEXT_PUBLIC_DEV_TOKEN ||16          cookieStore.get('access_token')?.value;17        const mixpanelDistinctId = cookieStore.get('mp_distinct_id')?.value;18        const swimlanes = header.get('swimlanes') || '';19        const userAgent = header.get('user-agent') || '';20        const requestId = header.get('X-Request-Id') || '';21        if (accessToken) {22          request.headers.set('Authorization', `Bearer ${accessToken}`);23        }24        if (mixpanelDistinctId) {25          request.headers.set('X-WB-User-ID', mixpanelDistinctId);26        }27        if (userAgent) {28          request.headers.set('user-agent', userAgent);29        }30        if (swimlanes) {31          request.headers.set('swimlanes', swimlanes);32        }33        if (requestId) {34          request.headers.set('X-Request-Id', requestId);35        }36      },37    ],38  },39});40const Get = <T = unknown>(url: string, options?: Options): Promise<T> => {41  return original.get(checkApiVersion(url), options).json<T>();42};43const Post = <T = unknown>(url: string, options?: Options): Promise<T> => {44  return original.post(checkApiVersion(url), options).json<T>();45};46const Put = <T = unknown>(url: string, options?: Options): Promise<T> => {47  return original.put(checkApiVersion(url), options).json<T>();48};49const Delete = <T = unknown>(url: string, options?: Options): Promise<T> => {50  return original.delete(checkApiVersion(url), options).json<T>();51};52export { Delete, Get, Post, Put };