diff --git a/.eslintrc.json b/.eslintrc.json
index b1e516f..3dcc82d 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -5,6 +5,9 @@
     "node": true,
     "jest/globals": true
   },
+  "globals": {
+    "RequestInit": true
+  },
   "ignorePatterns": [
     "build/"
   ],
diff --git a/nextjs/server/package.json b/nextjs/server/package.json
deleted file mode 100644
index bb5b084..0000000
--- a/nextjs/server/package.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "name": "@fief/fief/nextjs/server",
-  "private": true,
-  "main": "../../build/cjs/nextjs/server.js",
-  "module": "../../build/esm/nextjs/server.js",
-  "types": "../../build/esm/nextjs/server.d.ts"
-}
diff --git a/rollup.config.mjs b/rollup.config.mjs
index 2bc2b3f..ea3261d 100644
--- a/rollup.config.mjs
+++ b/rollup.config.mjs
@@ -45,7 +45,6 @@ export default [
       'src/express/index.ts',
       'src/nextjs/index.ts',
       'src/nextjs/react.tsx',
-      'src/nextjs/server.ts',
     ],
     plugins: [
       typescript({
@@ -73,7 +72,6 @@ export default [
       'src/express/index.ts',
       'src/nextjs/index.ts',
       'src/nextjs/react.tsx',
-      'src/nextjs/server.ts',
     ],
     plugins: [
       typescript({
diff --git a/src/client.ts b/src/client.ts
index 8e4d0a4..4f78ee1 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -228,6 +228,16 @@ export interface FiefParameters {
    * @see [ID Token encryption](https://docs.fief.dev/going-further/id-token-encryption/)
    */
   encryptionKey?: string;
+
+  /**
+   * Additional fetch init options for `getOpenIDConfiguration` and `getJWKS` requests.
+   *
+   * Mostly useful to control fetch cache.
+   *
+   * @see [fetch cache property](https://developer.mozilla.org/en-US/docs/Web/API/Request/cache)
+   * @see [Next.js fetch](https://nextjs.org/docs/app/api-reference/functions/fetch#fetchurl-options)
+   */
+  requestInit?: RequestInit;
 }
 
 /**
@@ -253,6 +263,8 @@ export class Fief {
 
   private fetch: typeof fetch;
 
+  private requestInit?: RequestInit;
+
   private openIDConfiguration?: Record<string, any>;
 
   private jwks?: jose.JSONWebKeySet;
@@ -274,6 +286,7 @@ export class Fief {
     }
 
     this.fetch = getFetch();
+    this.requestInit = parameters.requestInit;
 
     this.crypto = getCrypto();
   }
@@ -348,6 +361,7 @@ export class Fief {
    * @param redirectURI - The exact same `redirectURI` you passed to the authorization URL.
    * @param codeVerifier - The raw [PKCE](https://docs.fief.dev/going-further/pkce/) code
    * used to generate the code challenge during authorization.
+   * @param requestInit - Additional fetch init options. Mostly useful to control fetch cache.
    *
    * @returns A token response and user information.
    *
@@ -360,6 +374,7 @@ export class Fief {
     code: string,
     redirectURI: string,
     codeVerifier?: string,
+    requestInit?: RequestInit,
   ): Promise<[FiefTokenResponse, FiefUserInfo]> {
     const openIDConfiguration = await this.getOpenIDConfiguration();
     const payload = serializeQueryString({
@@ -374,9 +389,11 @@ export class Fief {
     const response = await this.fetch(
       openIDConfiguration.token_endpoint,
       {
+        ...requestInit || {},
         method: 'POST',
         body: payload,
         headers: {
+          ...requestInit && requestInit.headers ? requestInit.headers : {},
           'Content-Type': 'application/x-www-form-urlencoded',
         },
       },
@@ -402,6 +419,7 @@ export class Fief {
    * If not provided, the access token will share the same list of scopes
    * as requested the first time.
    * Otherwise, it should be a subset of the original list of scopes.
+   * @param requestInit - Additional fetch init options. Mostly useful to control fetch cache.
    *
    * @returns A token response and user information.
    *
@@ -413,6 +431,7 @@ export class Fief {
   public async authRefreshToken(
     refreshToken: string,
     scope?: string[],
+    requestInit?: RequestInit,
   ): Promise<[FiefTokenResponse, FiefUserInfo]> {
     const openIDConfiguration = await this.getOpenIDConfiguration();
     const payload = serializeQueryString({
@@ -425,9 +444,11 @@ export class Fief {
     const response = await this.fetch(
       openIDConfiguration.token_endpoint,
       {
+        ...requestInit || {},
         method: 'POST',
         body: payload,
         headers: {
+          ...requestInit && requestInit.headers ? requestInit.headers : {},
           'Content-Type': 'application/x-www-form-urlencoded',
         },
       },
@@ -452,6 +473,7 @@ export class Fief {
    * @param requiredScopes - Optional list of scopes to check for.
    * @param requiredACR - Optional minimum ACR level required. Read more: https://docs.fief.dev/going-further/acr/
    * @param requiredPermissions - Optional list of permissions to check for.
+   * @param requestInit - Additional fetch init options. Mostly useful to control fetch cache.
    *
    * @returns {@link FiefAccessTokenInfo}
    * @throws {@link FiefAccessTokenInvalid} if the access token is invalid.
@@ -548,6 +570,7 @@ export class Fief {
    * Return fresh {@link FiefUserInfo} from the Fief API using a valid access token.
    *
    * @param accessToken - A valid access token.
+   * @param requestInit - Additional fetch init options. Mostly useful to control fetch cache.
    *
    * @returns Fresh user information.
    *
@@ -556,13 +579,15 @@ export class Fief {
    * userinfo = await fief.userinfo('ACCESS_TOKEN');
    * ```
    */
-  public async userinfo(accessToken: string): Promise<FiefUserInfo> {
+  public async userinfo(accessToken: string, requestInit?: RequestInit): Promise<FiefUserInfo> {
     const openIDConfiguration = await this.getOpenIDConfiguration();
     const response = await this.fetch(
       openIDConfiguration.userinfo_endpoint,
       {
+        ...requestInit || {},
         method: 'GET',
         headers: {
+          ...requestInit && requestInit.headers ? requestInit.headers : {},
           Authorization: `Bearer ${accessToken}`,
         },
       },
@@ -577,6 +602,7 @@ export class Fief {
    *
    * @param accessToken - A valid access token.
    * @param data - An object containing the data to update.
+   * @param requestInit - Additional fetch init options. Mostly useful to control fetch cache.
    *
    * @returns Updated user information.
    *
@@ -590,14 +616,17 @@ export class Fief {
   public async updateProfile(
     accessToken: string,
     data: Record<string, any>,
+    requestInit?: RequestInit,
   ): Promise<FiefUserInfo> {
     const updateProfileEndpoint = `${this.baseURL}/api/profile`;
     const response = await this.fetch(
       updateProfileEndpoint,
       {
+        ...requestInit || {},
         method: 'PATCH',
         body: JSON.stringify(data),
         headers: {
+          ...requestInit && requestInit.headers ? requestInit.headers : {},
           'Content-Type': 'application/json',
           Authorization: `Bearer ${accessToken}`,
         },
@@ -615,6 +644,7 @@ export class Fief {
    *
    * @param accessToken - A valid access token.
    * @param newPassword - The new password.
+   * @param requestInit - Additional fetch init options. Mostly useful to control fetch cache.
    *
    * @returns Updated user information.
    *
@@ -626,14 +656,17 @@ export class Fief {
   public async changePassword(
     accessToken: string,
     newPassword: string,
+    requestInit?: RequestInit,
   ): Promise<FiefUserInfo> {
     const updateProfileEndpoint = `${this.baseURL}/api/password`;
     const response = await this.fetch(
       updateProfileEndpoint,
       {
+        ...requestInit || {},
         method: 'PATCH',
         body: JSON.stringify({ password: newPassword }),
         headers: {
+          ...requestInit && requestInit.headers ? requestInit.headers : {},
           'Content-Type': 'application/json',
           Authorization: `Bearer ${accessToken}`,
         },
@@ -654,6 +687,7 @@ export class Fief {
    *
    * @param accessToken - A valid access token.
    * @param newPassword - The new email address.
+   * @param requestInit - Additional fetch init options. Mostly useful to control fetch cache.
    *
    * @returns Updated user information.
    *
@@ -665,14 +699,17 @@ export class Fief {
   public async emailChange(
     accessToken: string,
     email: string,
+    requestInit?: RequestInit,
   ): Promise<FiefUserInfo> {
     const updateProfileEndpoint = `${this.baseURL}/api/email/change`;
     const response = await this.fetch(
       updateProfileEndpoint,
       {
+        ...requestInit || {},
         method: 'PATCH',
         body: JSON.stringify({ email }),
         headers: {
+          ...requestInit && requestInit.headers ? requestInit.headers : {},
           'Content-Type': 'application/json',
           Authorization: `Bearer ${accessToken}`,
         },
@@ -691,6 +728,7 @@ export class Fief {
    *
    * @param accessToken - A valid access token.
    * @param newPassword - The new email address.
+   * @param requestInit - Additional fetch init options. Mostly useful to control fetch cache.
    *
    * @returns Updated user information.
    *
@@ -702,14 +740,17 @@ export class Fief {
   public async emailVerify(
     accessToken: string,
     code: string,
+    requestInit?: RequestInit,
   ): Promise<FiefUserInfo> {
     const updateProfileEndpoint = `${this.baseURL}/api/email/verify`;
     const response = await this.fetch(
       updateProfileEndpoint,
       {
+        ...requestInit || {},
         method: 'POST',
         body: JSON.stringify({ code }),
         headers: {
+          ...requestInit && requestInit.headers ? requestInit.headers : {},
           'Content-Type': 'application/json',
           Authorization: `Bearer ${accessToken}`,
         },
@@ -752,6 +793,7 @@ export class Fief {
     const response = await this.fetch(
       `${this.baseURL}/.well-known/openid-configuration`,
       {
+        ...this.requestInit || {},
         method: 'GET',
       },
     );
@@ -771,6 +813,7 @@ export class Fief {
     const response = await this.fetch(
       openIDConfiguration.jwks_uri,
       {
+        ...this.requestInit || {},
         method: 'GET',
       },
     );
diff --git a/src/nextjs/index.ts b/src/nextjs/index.ts
index 3b2a053..5901a55 100644
--- a/src/nextjs/index.ts
+++ b/src/nextjs/index.ts
@@ -5,6 +5,8 @@
  */
 import type { IncomingMessage, OutgoingMessage } from 'http';
 import type { NextApiRequest, NextApiResponse } from 'next';
+import { revalidateTag } from 'next/cache';
+import { headers } from 'next/headers';
 import { NextRequest, NextResponse } from 'next/server';
 import { pathToRegexp } from 'path-to-regexp';
 
@@ -31,6 +33,16 @@ const defaultAPIForbiddenResponse = async (req: NextApiRequest, res: NextApiResp
   res.status(403).send('Forbidden');
 };
 
+const getServerSideHeaders = (headerName: string, req?: IncomingMessage): string | null => {
+  // "Legacy" Next.js, req object is required
+  if (req) {
+    return req.headers[headerName.toLowerCase()] as string | null;
+  }
+  // Next.js 14 style
+  const headersList = headers();
+  return headersList.get(headerName);
+};
+
 type FiefNextApiHandler<T> = (
   req: NextApiRequest & AuthenticateRequestResult,
   res: NextApiResponse<T>,
@@ -144,13 +156,6 @@ export interface FiefAuthParameters {
    */
   userIdHeaderName?: string;
 
-  /**
-   * Name of the request header where user information is made available by middleware.
-   *
-   * Defaults to `X-FiefAuth-User-Info`.
-   */
-  userInfoHeaderName?: string;
-
   /**
    * Name of the request header where access token is made available by middleware.
    *
@@ -238,8 +243,6 @@ class FiefAuth {
 
   private userIdHeaderName: string;
 
-  private userInfoHeaderName: string;
-
   private accessTokenHeaderName: string;
 
   private accessTokenInfoHeaderName: string;
@@ -282,7 +285,6 @@ class FiefAuth {
     ;
 
     this.userIdHeaderName = parameters.userIdHeaderName ? parameters.userIdHeaderName : 'X-FiefAuth-User-Id';
-    this.userInfoHeaderName = parameters.userInfoHeaderName ? parameters.userInfoHeaderName : 'X-FiefAuth-User-Info';
     this.accessTokenHeaderName = parameters.accessTokenHeaderName ? parameters.accessTokenHeaderName : 'X-FiefAuth-Access-Token';
     this.accessTokenInfoHeaderName = parameters.accessTokenInfoHeaderName ? parameters.accessTokenInfoHeaderName : 'X-FiefAuth-Access-Token-Info';
   }
@@ -408,9 +410,6 @@ class FiefAuth {
               JSON.stringify(result.accessTokenInfo),
             );
           }
-          if (result.user) {
-            requestHeaders.set(this.userInfoHeaderName, JSON.stringify(result.user));
-          }
           return NextResponse.next({ request: { headers: requestHeaders } });
         } catch (err) {
           if (err instanceof FiefAuthUnauthorized) {
@@ -533,6 +532,64 @@ class FiefAuth {
       )(req, res as NextApiResponse);
     };
   }
+
+  /**
+   * Return the user ID set in headers by the Fief middleware, or `null` if not authenticated.
+   *
+   * This function is suitable for server-side rendering in Next.js.
+   *
+   * @param req - Next.js request object. Required for older versions of Next.js
+   * not supporting the `headers()` function.
+   * @returns The user ID, or null if not available.
+   */
+  public getUserId(req?: IncomingMessage): string | null {
+    return getServerSideHeaders(this.userIdHeaderName, req);
+  }
+
+  /**
+   * Return the access token information set in headers by the Fief middleware,
+   * or `null` if not authenticated.
+   *
+   * This function is suitable for server-side rendering in Next.js.
+   *
+   * @param req - Next.js request object. Required for older versions of Next.js
+   * not supporting the `headers()` function.
+   * @returns he access token information, or null if not available.
+   */
+  public getAccessTokenInfo(req?: IncomingMessage): FiefAccessTokenInfo | null {
+    const rawAccessTokenInfo = getServerSideHeaders(this.accessTokenInfoHeaderName, req);
+    return rawAccessTokenInfo ? JSON.parse(rawAccessTokenInfo) : null;
+  }
+
+  /**
+   * Fetch the user information object from the Fief API, if access token is available.
+   *
+   * This function is suitable for server-side rendering in Next.js.
+   *
+   * @param req - Next.js request object. Required for older versions of Next.js
+   * not supporting the `headers()` function.
+   * @param refresh - If `true`, the user information will be refreshed from the Fief API.
+   * Otherwise, Next.js fetch cache will be used.
+   * @returns The user information, or null if access token is not available.
+   */
+  public async getUserInfo(
+    req?: IncomingMessage,
+    refresh: boolean = false,
+  ): Promise<FiefUserInfo | null> {
+    const accessTokenInfo = this.getAccessTokenInfo(req);
+    if (accessTokenInfo === null) {
+      return null;
+    }
+    const userId = accessTokenInfo.id;
+    if (refresh && !req) {
+      revalidateTag(userId);
+    }
+    const userinfo = await this.client.userinfo(
+      accessTokenInfo.access_token,
+      { cache: 'force-cache', next: { tags: [userId] } },
+    );
+    return userinfo;
+  }
 }
 
 export {
diff --git a/src/nextjs/server.ts b/src/nextjs/server.ts
deleted file mode 100644
index 628cc76..0000000
--- a/src/nextjs/server.ts
+++ /dev/null
@@ -1,60 +0,0 @@
-import { headers } from 'next/headers';
-
-import { FiefAccessTokenInfo, FiefUserInfo } from '../client';
-
-/**
- * Return the user ID set in headers by the Fief middleware, or `null` if not authenticated.
- *
- * This function is suitable for server-side rendering in Next.js.
- *
- * @param headerName - Name of the request header. Defaults to `X-FiefAuth-User-Id`.
- * @returns The user ID, or null if not available.
- */
-export const fiefUserId = (headerName: string = 'X-FiefAuth-User-Id'): string | null => {
-  const headersList = headers();
-  return headersList.get(headerName);
-};
-
-/**
- * Return the user information object set in headers by the Fief middleware,
- * or `null` if not authenticated.
- *
- * This function is suitable for server-side rendering in Next.js.
- *
- * @param headerName - Name of the request header. Defaults to `X-FiefAuth-User-Info`.
- * @returns The user information, or null if not available.
- */
-export const fiefUserInfo = (headerName: string = 'X-FiefAuth-User-Info'): FiefUserInfo | null => {
-  const headersList = headers();
-  const rawUserInfo = headersList.get(headerName);
-  return rawUserInfo ? JSON.parse(rawUserInfo) : null;
-};
-
-/**
- * Return the access token set in headers by the Fief middleware,
- * or `null` if not authenticated.
- *
- * This function is suitable for server-side rendering in Next.js.
- *
- * @param headerName - Name of the request header. Defaults to `X-FiefAuth-Access-Token`.
- * @returns The access token, or null if not available.
- */
-export const fiefAccessToken = (headerName: string = 'X-FiefAuth-Access-Token'): string | null => {
-  const headersList = headers();
-  return headersList.get(headerName);
-};
-
-/**
- * Return the access token information set in headers by the Fief middleware,
- * or `null` if not authenticated.
- *
- * This function is suitable for server-side rendering in Next.js.
- *
- * @param headerName - Name of the request header. Defaults to `X-FiefAuth-Access-Token-Info`.
- * @returns The access token information, or null if not available.
- */
-export const fiefAccessTokenInfo = (headerName: string = 'X-FiefAuth-Access-Token-Info'): FiefAccessTokenInfo | null => {
-  const headersList = headers();
-  const rawAccessTokenInfo = headersList.get(headerName);
-  return rawAccessTokenInfo ? JSON.parse(rawAccessTokenInfo) : null;
-};