From db2ca2bc73ecb7cf0b65b3d0301460b7c67356f4 Mon Sep 17 00:00:00 2001
From: Tsuyoshi Ushio <tsushi@microsoft.com>
Date: Thu, 5 Feb 2026 09:15:09 -0800
Subject: [PATCH 1/4] Fix HttpResponseBodyInit to include Node.js Readable
 streams

Fixes #409 - adds Readable from stream module to HttpResponseBodyInit type
to support HTTP streaming scenarios with Node.js streams.
---
 types/http.d.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/types/http.d.ts b/types/http.d.ts
index 555b192..5373544 100644
--- a/types/http.d.ts
+++ b/types/http.d.ts
@@ -2,6 +2,7 @@
 // Licensed under the MIT License.
 
 import { Blob } from 'buffer';
+import { Readable } from 'stream';
 import { ReadableStream } from 'stream/web';
 import { URLSearchParams } from 'url';
 import { FunctionOptions, FunctionOutput, FunctionResult, FunctionTrigger } from './index';
@@ -11,9 +12,11 @@ import { InvocationContext } from './InvocationContext';
  * Represents the body types that can be used in an HTTP response.
  * This is a local definition to avoid dependency on lib.dom.
  * Compatible with Node.js native Fetch API body types.
+ * Includes Node.js Readable streams for HTTP streaming scenarios.
  */
 export type HttpResponseBodyInit =
     | ReadableStream
+    | Readable
     | Blob
     | ArrayBufferView
     | ArrayBuffer

From edbf5342b1ea2337a076d848e56ae22400154dc5 Mon Sep 17 00:00:00 2001
From: Tsuyoshi Ushio <tsushi@microsoft.com>
Date: Thu, 5 Feb 2026 09:26:03 -0800
Subject: [PATCH 2/4] Add tests for Node.js Readable stream body support

---
 test/http/HttpResponse.test.ts | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/test/http/HttpResponse.test.ts b/test/http/HttpResponse.test.ts
index a5bfaa2..82f9614 100644
--- a/test/http/HttpResponse.test.ts
+++ b/test/http/HttpResponse.test.ts
@@ -6,6 +6,7 @@ import { Blob } from 'buffer';
 import * as chai from 'chai';
 import { expect } from 'chai';
 import * as chaiAsPromised from 'chai-as-promised';
+import { Readable } from 'stream';
 import { ReadableStream } from 'stream/web';
 import { HttpResponse } from '../../src/http/HttpResponse';
 
@@ -366,6 +367,39 @@ describe('HttpResponse', () => {
             });
             expect(await res.text()).to.equal('Stream content');
         });
+
+        it('Node.js Readable stream body', async () => {
+            // Create a Node.js Readable stream (common for HTTP streaming scenarios)
+            const readable = new Readable({
+                read() {
+                    this.push('Readable ');
+                    this.push('stream ');
+                    this.push('content');
+                    this.push(null); // Signal end of stream
+                },
+            });
+
+            const res = new HttpResponse({
+                body: readable,
+            });
+            expect(await res.text()).to.equal('Readable stream content');
+        });
+
+        it('Node.js Readable stream from async generator', async () => {
+            // Common pattern for HTTP streaming (e.g., AI chat responses)
+            async function* generateChunks() {
+                yield 'Hello ';
+                yield 'from ';
+                yield 'stream';
+            }
+
+            const readable = Readable.from(generateChunks());
+
+            const res = new HttpResponse({
+                body: readable,
+            });
+            expect(await res.text()).to.equal('Hello from stream');
+        });
     });
 
     describe('HttpHeadersInit types', () => {

From 1d17f2a6c110e684c00db6660997768b11f92c21 Mon Sep 17 00:00:00 2001
From: Tsuyoshi Ushio <tsushi@microsoft.com>
Date: Thu, 5 Feb 2026 09:37:29 -0800
Subject: [PATCH 3/4] Fix lint error and bump version to 4.11.2

---
 package.json                   | 2 +-
 test/http/HttpResponse.test.ts | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/package.json b/package.json
index ef544a2..d883a2b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@azure/functions",
-    "version": "4.11.1",
+    "version": "4.11.2",
     "description": "Microsoft Azure Functions NodeJS Framework",
     "keywords": [
         "azure",
diff --git a/test/http/HttpResponse.test.ts b/test/http/HttpResponse.test.ts
index 82f9614..bfe5469 100644
--- a/test/http/HttpResponse.test.ts
+++ b/test/http/HttpResponse.test.ts
@@ -387,7 +387,7 @@ describe('HttpResponse', () => {
 
         it('Node.js Readable stream from async generator', async () => {
             // Common pattern for HTTP streaming (e.g., AI chat responses)
-            async function* generateChunks() {
+            function* generateChunks() {
                 yield 'Hello ';
                 yield 'from ';
                 yield 'stream';

From 269b058f9216963a19de48cc89e0d9a8c6985a1c Mon Sep 17 00:00:00 2001
From: Tsuyoshi Ushio <tsushi@microsoft.com>
Date: Thu, 5 Feb 2026 09:43:28 -0800
Subject: [PATCH 4/4] Update version in src/constants.ts to 4.11.2

---
 src/constants.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/constants.ts b/src/constants.ts
index b92e8d3..38e44a1 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -1,6 +1,6 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT License.
 
-export const version = '4.11.1';
+export const version = '4.11.2';
 
 export const returnBindingKey = '$return';