diff --git a/packages/browser-sdk/src/client.ts b/packages/browser-sdk/src/client.ts
index d4d73217..16ef9302 100644
--- a/packages/browser-sdk/src/client.ts
+++ b/packages/browser-sdk/src/client.ts
@@ -256,6 +256,13 @@ export type InitOptions = {
    */
   staleTimeMs?: number;
 
+  /**
+   * When proxying requests, you may want to include credentials like cookies
+   * so you can authorize the request in the proxy.
+   * This option controls the `credentials` option of the fetch API.
+   */
+  credentials?: "include" | "same-origin" | "omit";
+
   /**
    * Base URL of Bucket servers for SSE connections used by AutoFeedback.
    */
@@ -387,6 +394,7 @@ export class BucketClient {
     this.httpClient = new HttpClient(this.publishableKey, {
       baseUrl: this.config.apiBaseUrl,
       sdkVersion: opts?.sdkVersion,
+      credentials: opts?.credentials,
     });
 
     this.featuresClient = new FeaturesClient(
@@ -458,7 +466,6 @@ export class BucketClient {
     }
 
     await this.featuresClient.initialize();
-
     if (this.context.user && this.config.enableTracking) {
       this.user().catch((e) => {
         this.logger.error("error sending user", e);
diff --git a/packages/browser-sdk/src/httpClient.ts b/packages/browser-sdk/src/httpClient.ts
index 43c925f8..5eccca55 100644
--- a/packages/browser-sdk/src/httpClient.ts
+++ b/packages/browser-sdk/src/httpClient.ts
@@ -3,12 +3,15 @@ import { API_BASE_URL, SDK_VERSION, SDK_VERSION_HEADER_NAME } from "./config";
 export interface HttpClientOptions {
   baseUrl?: string;
   sdkVersion?: string;
+  credentials?: RequestCredentials;
 }
 
 export class HttpClient {
   private readonly baseUrl: string;
   private readonly sdkVersion: string;
 
+  private readonly fetchOptions: RequestInit;
+
   constructor(
     public publishableKey: string,
     opts: HttpClientOptions = {},
@@ -21,6 +24,7 @@ export class HttpClient {
       this.baseUrl += "/";
     }
     this.sdkVersion = opts.sdkVersion ?? SDK_VERSION;
+    this.fetchOptions = { credentials: opts.credentials };
   }
 
   getUrl(path: string): URL {
@@ -50,13 +54,14 @@ export class HttpClient {
     url.search = params.toString();
 
     if (timeoutMs === undefined) {
-      return fetch(url);
+      return fetch(url, this.fetchOptions);
     }
 
     const controller = new AbortController();
     const id = setTimeout(() => controller.abort(), timeoutMs);
 
     const res = await fetch(url, {
+      ...this.fetchOptions,
       signal: controller.signal,
     });
     clearTimeout(id);
@@ -73,6 +78,7 @@ export class HttpClient {
     body: any;
   }): ReturnType<typeof fetch> {
     return fetch(this.getUrl(path), {
+      ...this.fetchOptions,
       method: "POST",
       headers: {
         "Content-Type": "application/json",
diff --git a/packages/browser-sdk/test/httpClient.test.ts b/packages/browser-sdk/test/httpClient.test.ts
index 9996c498..c71a74da 100644
--- a/packages/browser-sdk/test/httpClient.test.ts
+++ b/packages/browser-sdk/test/httpClient.test.ts
@@ -1,4 +1,4 @@
-import { expect, test } from "vitest";
+import { afterEach, beforeEach, describe, expect, test, vi } from "vitest";
 
 import { HttpClient } from "../src/httpClient";
 
@@ -20,3 +20,44 @@ test.each(cases)("url construction with `path`: %s -> %s", (base, expected) => {
   const client = new HttpClient("publishableKey", { baseUrl: base });
   expect(client.getUrl("path").toString()).toBe(expected);
 });
+
+describe("sets `credentials`", () => {
+  beforeEach(() => {
+    vi.spyOn(global, "fetch").mockResolvedValue(new Response());
+  });
+
+  afterEach(() => {
+    vi.resetAllMocks();
+  });
+  test("default credentials", async () => {
+    const client = new HttpClient("publishableKey");
+
+    await client.get({ path: "/test" });
+    expect(global.fetch).toHaveBeenCalledWith(
+      expect.any(URL),
+      expect.objectContaining({ credentials: undefined }),
+    );
+
+    await client.post({ path: "/test", body: {} });
+    expect(global.fetch).toHaveBeenCalledWith(
+      expect.any(URL),
+      expect.objectContaining({ credentials: undefined }),
+    );
+  });
+
+  test("custom credentials", async () => {
+    const client = new HttpClient("publishableKey", { credentials: "include" });
+
+    await client.get({ path: "/test" });
+    expect(global.fetch).toHaveBeenCalledWith(
+      expect.any(URL),
+      expect.objectContaining({ credentials: "include" }),
+    );
+
+    await client.post({ path: "/test", body: {} });
+    expect(global.fetch).toHaveBeenCalledWith(
+      expect.any(URL),
+      expect.objectContaining({ credentials: "include" }),
+    );
+  });
+});
diff --git a/packages/browser-sdk/test/init.test.ts b/packages/browser-sdk/test/init.test.ts
index 5c5b4363..a7c4c191 100644
--- a/packages/browser-sdk/test/init.test.ts
+++ b/packages/browser-sdk/test/init.test.ts
@@ -17,7 +17,7 @@ const logger = {
 };
 
 beforeEach(() => {
-  vi.resetAllMocks();
+  vi.clearAllMocks();
 });
 
 describe("init", () => {
@@ -89,4 +89,19 @@ describe("init", () => {
 
     expect(post).not.toHaveBeenCalled();
   });
+
+  test("passes credentials correctly to httpClient", async () => {
+    const credentials = "include";
+    const bucketInstance = new BucketClient({
+      publishableKey: KEY,
+      user: { id: "foo" },
+      credentials,
+    });
+
+    await bucketInstance.initialize();
+
+    expect(bucketInstance["httpClient"]["fetchOptions"].credentials).toBe(
+      credentials,
+    );
+  });
 });
diff --git a/vitest.workspace.js b/vitest.workspace.js
index 686bcea3..1ff8757f 100644
--- a/vitest.workspace.js
+++ b/vitest.workspace.js
@@ -6,6 +6,4 @@ export default defineWorkspace([
   "./packages/openfeature-node-provider/vite.config.js",
   "./packages/node-sdk/vite.config.js",
   "./packages/react-sdk/vite.config.mjs",
-  "./packages/tracking-sdk/vite.e2e.config.js",
-  "./packages/tracking-sdk/vite.config.js",
 ]);