From 0e14f5f04af16bc7c35ab2f767e5ce23de3d777a Mon Sep 17 00:00:00 2001
From: Podugboch <odu.pisc@gmail.com>
Date: Mon, 19 Oct 2026 22:37:23 +0100
Subject: [PATCH] Bump http-proxy-middleware to 3.0.0 (#5178)

---
 CHANGELOG.md                                  |  1 +
 packages/test/harness/package.json            |  6 +---
 .../harness/src/host/jest-server/index.js     | 28 ++++++++++---------
 .../app/src/setupProxy.js                     |  4 +--
 4 files changed, 19 insertions(+), 20 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d32d8a4300..4315851d2f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,7 @@ Legends:
 
 - 💥 `useSendMessage`: `init.attachments[].thumbnailURL` must be data URI, otherwise will be ignored, in PR [#5871](https://github.com/microsoft/BotFramework-WebChat/pull/5871), by [@compulim](https://github.com/compulim)
 - 👷🏻 Visual regression tests now use 5 consecutive screenshots for stability indication, up from 2, in PR [#5871](https://github.com/microsoft/BotFramework-WebChat/pull/5871), by [@compulim](https://github.com/compulim)
+- 👷🏻 Bumped `http-proxy-middleware` to 3.0.0, fixes [#5178](https://github.com/microsoft/BotFramework-WebChat/issues/5178), by [@Podugboch](https://github.com/Podugboch)
 
 ### Removed
 
diff --git a/packages/test/harness/package.json b/packages/test/harness/package.json
index 7274ea0e7d..367ab7b0ea 100644
--- a/packages/test/harness/package.json
+++ b/packages/test/harness/package.json
@@ -38,10 +38,6 @@
       "3",
       "global-agent@4 changed its signature, need time to migrate"
     ],
-    "http-proxy-middleware": [
-      "2",
-      "http-proxy-middleware@3 has breaking changes, need time to migrate"
-    ],
     "jest": [
       "29",
       "jest@30 is not supported by jest-image-snapshot@6.5.1"
@@ -61,7 +57,7 @@
     "esbuild": "^0.28.0",
     "express": "^5.2.1",
     "global-agent": "^3.0.0",
-    "http-proxy-middleware": "^2.0.9",
+    "http-proxy-middleware": "^3.0.0",
     "istanbul-lib-coverage": "^3.2.2",
     "jest": "^29.7.0",
     "jest-environment-node": "^29.7.0",
diff --git a/packages/test/harness/src/host/jest-server/index.js b/packages/test/harness/src/host/jest-server/index.js
index b8f4ff7d34..475cf50c9e 100644
--- a/packages/test/harness/src/host/jest-server/index.js
+++ b/packages/test/harness/src/host/jest-server/index.js
@@ -195,25 +195,27 @@ async function prepareSession(sessionId) {
     },
     createProxyMiddleware({
       ...DEFAULT_PROXY_OPTIONS,
-      onProxyRes: responseInterceptor(async responseBuffer => {
-        const session = JSON.parse(responseBuffer.toString());
+      on: {
+        proxyRes: responseInterceptor(async responseBuffer => {
+          const session = JSON.parse(responseBuffer.toString());
 
-        const entry = { busy: true, numUsed: 1, session, sessionId: session.value.sessionId, startTime: Date.now() };
+          const entry = { busy: true, numUsed: 1, session, sessionId: session.value.sessionId, startTime: Date.now() };
 
-        pool.push(entry);
+          pool.push(entry);
 
-        setTimeout(() => housekeep(pool), INSTANCE_LIFE - INSTANCE_MIN_LIFE);
+          setTimeout(() => housekeep(pool), INSTANCE_LIFE - INSTANCE_MIN_LIFE);
 
-        await prepareSession(entry.sessionId);
+          await prepareSession(entry.sessionId);
 
-        console.log(
-          `New instance ${entry.sessionId} created. Now the pool has ${pool.length} instances: [${pool
-            .map(runLeft)
-            .join(', ')}].`
-        );
+          console.log(
+            `New instance ${entry.sessionId} created. Now the pool has ${pool.length} instances: [${pool
+              .map(runLeft)
+              .join(', ')}].`
+          );
 
-        return responseBuffer;
-      }),
+          return responseBuffer;
+        })
+      },
       selfHandleResponse: true
     })
   );
diff --git a/samples/07.advanced-web-chat-apps/b.sso-for-enterprise/app/src/setupProxy.js b/samples/07.advanced-web-chat-apps/b.sso-for-enterprise/app/src/setupProxy.js
index 2d62cc6ec6..a946314aa3 100644
--- a/samples/07.advanced-web-chat-apps/b.sso-for-enterprise/app/src/setupProxy.js
+++ b/samples/07.advanced-web-chat-apps/b.sso-for-enterprise/app/src/setupProxy.js
@@ -1,6 +1,6 @@
-const proxy = require('http-proxy-middleware');
+const { createProxyMiddleware } = require('http-proxy-middleware');
 
 // Passthru-ing API traffic to /rest-api/
 module.exports = app => {
-  app.use(proxy('/api', { target: 'http://localhost:5000/' }));
+  app.use(createProxyMiddleware('/api', { target: 'http://localhost:5000/' }));
 };