diff --git a/tests/page/page-request-continue.spec.ts b/tests/page/page-request-continue.spec.ts
index bc31743d4c..8300959718 100644
--- a/tests/page/page-request-continue.spec.ts
+++ b/tests/page/page-request-continue.spec.ts
@@ -173,6 +173,25 @@ it.describe('post data', () => {
     expect((await serverRequest.postBody).toString('utf8')).toBe('doggo');
   });
 
+  it('should compute content-length from post data', async ({ page, server, browserName }) => {
+    it.info().annotations.push({ type: 'issue', description: 'https://github.com/microsoft/playwright/issues/16027' });
+    it.fixme(browserName === 'firefox');
+    await page.goto(server.EMPTY_PAGE);
+    const data = 'a'.repeat(7500);
+    await page.route('**/*', route => {
+      const headers = route.request().headers();
+      headers['content-type'] =  'application/json';
+      route.continue({ postData: data, headers });
+    });
+    const [serverRequest] = await Promise.all([
+      server.waitForRequest('/sleep.zzz'),
+      page.evaluate(() => fetch('/sleep.zzz', { method: 'PATCH', body: 'birdy' }))
+    ]);
+    expect((await serverRequest.postBody).toString('utf8')).toBe(data);
+    expect(serverRequest.headers['content-length']).toBe(String(data.length));
+    expect(serverRequest.headers['content-type']).toBe('application/json');
+  });
+
   it('should amend method and post data', async ({ page, server }) => {
     await page.goto(server.EMPTY_PAGE);
     await page.route('**/*', route => {