diff --git a/apps/demo-nextjs-app-router/app/queue/page.tsx b/apps/demo-nextjs-app-router/app/queue/page.tsx
index e663a3b..e979728 100644
--- a/apps/demo-nextjs-app-router/app/queue/page.tsx
+++ b/apps/demo-nextjs-app-router/app/queue/page.tsx
@@ -52,8 +52,9 @@ export default function Home() {
       const result: any = await fal.subscribe(endpointId, {
         input: JSON.parse(input),
         logs: true,
-        mode: 'streaming',
-        // pollInterval: 1000,
+        // mode: "streaming",
+        mode: 'polling',
+        pollInterval: 1000,
         onQueueUpdate(update) {
           console.log('queue update');
           console.log(update);
diff --git a/libs/client/package.json b/libs/client/package.json
index 608083e..e7a4831 100644
--- a/libs/client/package.json
+++ b/libs/client/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@fal-ai/serverless-client",
   "description": "The fal serverless JS/TS client",
-  "version": "0.13.0",
+  "version": "0.14.0-alpha.1",
   "license": "MIT",
   "repository": {
     "type": "git",
diff --git a/libs/client/src/config.ts b/libs/client/src/config.ts
index 5395082..00315bf 100644
--- a/libs/client/src/config.ts
+++ b/libs/client/src/config.ts
@@ -13,6 +13,7 @@ export type Config = {
   proxyUrl?: string;
   requestMiddleware?: RequestMiddleware;
   responseHandler?: ResponseHandler<any>;
+  fetch?: typeof fetch;
 };
 
 export type RequiredConfig = Required<Config>;
@@ -64,8 +65,8 @@ export function config(config: Config) {
     configuration = {
       ...configuration,
       requestMiddleware: withMiddleware(
-        configuration.requestMiddleware,
-        withProxy({ targetUrl: config.proxyUrl })
+        withProxy({ targetUrl: config.proxyUrl }),
+        configuration.requestMiddleware
       ),
     };
   }
diff --git a/libs/client/src/request.ts b/libs/client/src/request.ts
index 19af2a2..618eb7f 100644
--- a/libs/client/src/request.ts
+++ b/libs/client/src/request.ts
@@ -14,6 +14,7 @@ export async function dispatchRequest<Input, Output>(
     credentials: credentialsValue,
     requestMiddleware,
     responseHandler,
+    fetch = global.fetch,
   } = getConfig();
   const userAgent = isBrowser() ? {} : { 'User-Agent': getUserAgent() };
   const credentials =
diff --git a/libs/client/src/storage.ts b/libs/client/src/storage.ts
index 1388823..3544815 100644
--- a/libs/client/src/storage.ts
+++ b/libs/client/src/storage.ts
@@ -76,6 +76,7 @@ type KeyValuePair = [string, any];
 
 export const storageImpl: StorageSupport = {
   upload: async (file: Blob) => {
+    const { fetch = global.fetch } = getConfig();
     const { upload_url: uploadUrl, file_url: url } = await initiateUpload(file);
     const response = await fetch(uploadUrl, {
       method: 'PUT',
diff --git a/libs/client/src/streaming.ts b/libs/client/src/streaming.ts
index 6dd7aa9..1ee1df4 100644
--- a/libs/client/src/streaming.ts
+++ b/libs/client/src/streaming.ts
@@ -1,5 +1,6 @@
 import { createParser } from 'eventsource-parser';
 import { getTemporaryAuthToken } from './auth';
+import { getConfig } from './config';
 import { buildUrl } from './function';
 import { ApiError, defaultResponseHandler } from './response';
 import { storageImpl } from './storage';
@@ -83,6 +84,7 @@ export class FalStream<Input, Output> {
   private start = async () => {
     const { url, options } = this;
     const { input, method = 'post' } = options;
+    const { fetch = global.fetch } = getConfig();
     try {
       const response = await fetch(url, {
         method: method.toUpperCase(),