diff --git a/package-lock.json b/package-lock.json
index c216b1281c..093e08df01 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -26,6 +26,7 @@
         "@types/babel__core": "^7.20.2",
         "@types/codemirror": "^5.60.7",
         "@types/formidable": "^2.0.4",
+        "@types/http-proxy": "^1.17.15",
         "@types/immutable": "^3.8.7",
         "@types/node": "^18.19.39",
         "@types/react": "^18.0.12",
@@ -53,6 +54,7 @@
         "eslint-plugin-react": "^7.35.0",
         "eslint-plugin-react-hooks": "^4.6.2",
         "formidable": "^2.1.1",
+        "http-proxy": "^1.18.1",
         "immutable": "^4.3.7",
         "license-checker": "^25.0.1",
         "mime": "^3.0.0",
@@ -1831,6 +1833,16 @@
       "integrity": "sha512-1m0bIFVc7eJWyve9S0RnuRgcQqF/Xd5QsUZAZeQFr1Q3/p9JWoQQEqmVy+DPTNpGXwhgIetAoYF8JSc33q29QA==",
       "dev": true
     },
+    "node_modules/@types/http-proxy": {
+      "version": "1.17.15",
+      "resolved": "https://registry.npmjs.org/@types/http-proxy/-/http-proxy-1.17.15.tgz",
+      "integrity": "sha512-25g5atgiVNTIv0LBDTg1H74Hvayx0ajtJPLLcYE3whFv75J0pWNtOBzaXJQgDTmrX1bx5U9YC2w/n65BN1HwRQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/immutable": {
       "version": "3.8.7",
       "resolved": "https://registry.npmjs.org/@types/immutable/-/immutable-3.8.7.tgz",
@@ -3908,6 +3920,13 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/eventemitter3": {
+      "version": "4.0.7",
+      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-4.0.7.tgz",
+      "integrity": "sha512-8guHBZCwKnFhYdHr2ysuRWErTwhoN2X8XELRlrRwpmfeY2jjuUN4taQMsULKUVo1K4DvZl+0pgfyoysHxvmvEw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/extract-zip": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/extract-zip/-/extract-zip-2.0.1.tgz",
@@ -4046,6 +4065,27 @@
       "integrity": "sha512-36yxDn5H7OFZQla0/jFJmbIKTdZAQHngCedGxiMmpNfEZM0sdEeT+WczLQrjK6D7o2aiyLYDnkw0R3JK0Qv1RQ==",
       "dev": true
     },
+    "node_modules/follow-redirects": {
+      "version": "1.15.9",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.15.9.tgz",
+      "integrity": "sha512-gew4GsXizNgdoRyqmyfMHyAmXsZDk6mHkSxZFCzW9gwlbtOW44CDtYavM+y+72qD/Vq2l550kMF52DT8fOLJqQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/RubenVerborgh"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=4.0"
+      },
+      "peerDependenciesMeta": {
+        "debug": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/for-each": {
       "version": "0.3.3",
       "resolved": "https://registry.npmjs.org/for-each/-/for-each-0.3.3.tgz",
@@ -4527,6 +4567,21 @@
       "integrity": "sha512-er295DKPVsV82j5kw1Gjt+ADA/XYHsajl82cGNQG2eyoPkvgUhX+nDIyelzhIWbbsXP39EHcI6l5tYs2FYqYXQ==",
       "dev": true
     },
+    "node_modules/http-proxy": {
+      "version": "1.18.1",
+      "resolved": "https://registry.npmjs.org/http-proxy/-/http-proxy-1.18.1.tgz",
+      "integrity": "sha512-7mz/721AbnJwIVbnaSv1Cz3Am0ZLT/UBwkC92VlxhXv/k/BBQfM2fXElQNC27BVGr0uwUpplYPQM9LnaBMR5NQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "eventemitter3": "^4.0.0",
+        "follow-redirects": "^1.0.0",
+        "requires-port": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=8.0.0"
+      }
+    },
     "node_modules/http2-wrapper": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/http2-wrapper/-/http2-wrapper-1.0.3.tgz",
@@ -6107,6 +6162,13 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/requires-port": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/requires-port/-/requires-port-1.0.0.tgz",
+      "integrity": "sha512-KigOCHcocU3XODJxsu8i/j8T9tzT4adHiecwORRQ0ZZFcp7ahwXuRU1m+yuO90C5ZUyGeGfocHDI14M3L3yDAQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/resolve": {
       "version": "2.0.0-next.5",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-2.0.0-next.5.tgz",
diff --git a/package.json b/package.json
index f36e9039e3..f019f6eacc 100644
--- a/package.json
+++ b/package.json
@@ -65,6 +65,7 @@
     "@types/babel__core": "^7.20.2",
     "@types/codemirror": "^5.60.7",
     "@types/formidable": "^2.0.4",
+    "@types/http-proxy": "^1.17.15",
     "@types/immutable": "^3.8.7",
     "@types/node": "^18.19.39",
     "@types/react": "^18.0.12",
@@ -92,6 +93,7 @@
     "eslint-plugin-react": "^7.35.0",
     "eslint-plugin-react-hooks": "^4.6.2",
     "formidable": "^2.1.1",
+    "http-proxy": "^1.18.1",
     "immutable": "^4.3.7",
     "license-checker": "^25.0.1",
     "mime": "^3.0.0",
diff --git a/tests/playwright-test/ui-mode-trace.spec.ts b/tests/playwright-test/ui-mode-trace.spec.ts
index eb56204813..863a283d2f 100644
--- a/tests/playwright-test/ui-mode-trace.spec.ts
+++ b/tests/playwright-test/ui-mode-trace.spec.ts
@@ -16,6 +16,9 @@
 
 import { createImage } from './playwright-test-fixtures';
 import { test, expect, retries } from './ui-mode-fixtures';
+import http from 'node:http';
+import httpProxy from 'http-proxy';
+import { ManualPromise } from 'packages/playwright-core/lib/utils/manualPromise';
 
 test.describe.configure({ mode: 'parallel', retries });
 
@@ -339,3 +342,55 @@ test('should show request source context id', async ({ runUITest, server }) => {
   await expect(page.getByText('page#2')).toBeVisible();
   await expect(page.getByText('api#1')).toBeVisible();
 });
+
+test('should work behind proxy', async ({ runUITest }, testInfo) => {
+  const { page } = await runUITest({
+    'a.test.ts': `
+      import { test, expect } from '@playwright/test';
+      test('trace test', async ({ page }) => {
+        await page.setContent('<button>Submit</button>');
+        await page.getByRole('button').click();
+        expect(1).toBe(1);
+      });
+    `,
+  });
+
+  const prefix = '/subdir';
+  const origin = new URL(page.url());
+  const proxy = httpProxy.createProxy({ target: { port: origin.port }, ws: true });
+
+  const proxyServer = http.createServer((req, res) => {
+    req.url = req.url!.replace(prefix, '');
+    proxy.web(req, res);
+  });
+  proxyServer.on('upgrade', (req, socket, head) => {
+    req.url = req.url!.replace(prefix, '');
+    proxy.ws(req, socket, head);
+  });
+
+  const proxyPort = 9010 + testInfo.workerIndex * 4;
+  await new Promise<void>(resolve => proxyServer.listen(proxyPort, resolve));
+
+  const proxyURL = new URL(origin);
+  proxyURL.host = `localhost:${proxyPort}`;
+  proxyURL.pathname = prefix + proxyURL.pathname;
+
+  await page.goto(proxyURL.toString());
+
+  await page.getByText('trace test').dblclick();
+
+  await expect(page.getByTestId('actions-tree')).toMatchAriaSnapshot(`
+    - tree:
+      - treeitem /Before Hooks \\d+[hmsp]+/
+      - treeitem /page\\.setContent \\d+[hmsp]+/
+      - treeitem /locator\\.clickgetByRole\\('button'\\) \\d+[hmsp]+/
+      - treeitem /expect\\.toBe \\d+[hmsp]+/ [selected]
+      - treeitem /After Hooks \\d+[hmsp]+/
+  `);
+
+  await expect(
+      page.frameLocator('iframe.snapshot-visible[name=snapshot]').locator('button'),
+  ).toHaveText('Submit');
+
+  proxyServer.close();
+});