Default useragent

packages/puppeteer-core/src/cdp/Browser.ts

@@ -340,7 +340,11 @@ export class CdpBrowser extends BrowserBase {
   }
 
   override async newPage(): Promise<Page> {
-    return await this.#defaultContext.newPage();
+    const page = await this.#defaultContext.newPage();
+    await page.setUserAgent(
+      'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36'
+    );
+    return page;
   }
 
   async _createPageInContext(contextId?: string): Promise<Page> {

test/src/page.spec.ts

@@ -23,6 +23,18 @@
 describe('Page', function () {
   setupTestBrowserHooks();
 
+  describe('Useragent', function () {
+    it('should have a default user agent set', async () => {
+      const {context} = await getTestState();
+      const newPage = await context.newPage();
+      const userAgent = await newPage.evaluate(() => navigator.userAgent);
+      assert.strictEqual(
+        userAgent,
+        'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36'
+      );
+    });
+  });
+
   describe('Page.close', function () {
     it('should reject all promises when page is closed', async () => {
       const {context} = await getTestState();