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Confirm which kind of authentication the page uses
HTTP Basic Authentication is the browser/server challenge that asks for credentials before serving a page. In Playwright, configure those credentials on the browser context, rather than trying to pass them as a screenshot option. You can restrict credentials to an origin so they are not sent to unrelated sites. See Playwright’s browser context documentation.
A site that displays its own username-and-password form uses an application login flow instead. For that case, automate the form and consider saving and reusing authenticated browser state as described in Playwright’s authentication guidance. Do not treat a login form as an HTTP Basic challenge.
Create a Playwright screenshot script
Below is a Node.js example for HTTP Basic Authentication. It reads credentials from environment variables, opens a fresh browser context, waits for a page-specific readiness selector, then saves a full-page PNG. Install Playwright and its browser first using the steps in the Playwright CI guide; the runner must also have the required browser dependencies.
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import { chromium } from 'playwright';
const username = process.env.BASIC_AUTH_USERNAME;
const password = process.env.BASIC_AUTH_PASSWORD;
const targetUrl = process.env.TARGET_URL;
const readySelector = process.env.READY_SELECTOR;
if (!username || !password || !targetUrl || !readySelector) {
throw new Error('Set BASIC_AUTH_USERNAME, BASIC_AUTH_PASSWORD, TARGET_URL, and READY_SELECTOR');
}
const browser = await chromium.launch({ headless: true });
try {
const context = await browser.newContext({
httpCredentials: {
username,
password,
origin: new URL(targetUrl).origin,
},
});
try {
const page = await context.newPage();
const response = await page.goto(targetUrl, { waitUntil: 'domcontentloaded' });
if (!response || !response.ok()) {
throw new Error(`Navigation failed: ${response?.status() ?? 'no response'}`);
}
await page.locator(readySelector).waitFor({ state: 'visible', timeout: 30000 });
await page.screenshot({ path: 'screenshot.png', fullPage: true });
} finally {
await context.close();
}
} finally {
await browser.close();
}Set READY_SELECTOR to an element that indicates the content you intend to inspect is ready—for example, a report heading or a dashboard container. No single readiness condition works for every site. If a fixed visible area is what matters, change fullPage: true to fullPage: false to capture the viewport. Playwright’s screenshot API documents file output and full-page capture at Screenshots.
Schedule the script to run
The scheduler should invoke the script in an environment that can reach the protected page and install or provide the required browser. You can use an existing CI workflow or a system scheduler on a maintained host. Choose based on where the page is reachable, how secrets are stored, who handles failed runs, and where output images are retained.
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For CI, configure the provider’s scheduling trigger to run the same workflow that installs dependencies and executes the script. Playwright’s CI documentation covers running browser automation in CI, but the schedule syntax and availability depend on your provider; consult its current documentation. On a system you manage, configure its scheduler to run the script on your desired cadence, with the environment variables supplied securely to that process.
- Put the script and dependency setup in the repository or deployment environment used by the runner.
- Add
BASIC_AUTH_USERNAME,BASIC_AUTH_PASSWORD,TARGET_URL, andREADY_SELECTORthrough the runner’s secret and configuration settings. - Set the schedule in the CI provider or system scheduler, and configure the output destination and failure notifications.
- Run once manually before enabling the recurring schedule. Confirm the image is complete and that failed runs are visible to someone responsible for the job.
Protect credentials and captured images
- Do not commit passwords or authenticated state files. Playwright warns that state files can contain cookies and headers capable of impersonating an account and says, “We strongly discourage checking them into private or public repositories.” Its authentication guidance also recommends adding the authentication-state directory to
.gitignore. - Use the runner’s secret mechanism, grant access only to the people and jobs that need it, and avoid printing secrets in logs.
- Restrict access to the screenshots and their storage location: authenticated pages may contain sensitive information.
- If the site is available only on a private network, ensure the scheduled runner has authorized network access rather than exposing the page publicly for convenience.
Keep recurring captures comparable
For visual comparisons over time, keep the browser version, operating system, viewport, browser settings, and headless mode consistent where possible. Playwright notes that rendering can vary with operating system, browser version, settings, hardware, power source, and headless mode. Even with a stable environment, dynamic page content can change between runs, so wait for a meaningful site-specific condition rather than relying only on a fixed delay.
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Troubleshoot common failures
- The page keeps prompting for credentials or returns an authorization error: Check that the username and password are current, the page really uses HTTP Basic Authentication, and the context’s
originmatches the protected page’s origin. If credentials are wrong or the site uses a form login, the Basic Authentication configuration will not complete sign-in. - The job works locally but fails on the schedule: Check that the scheduled environment has the browser and its dependencies installed, can reach the target network location, and receives the required environment variables. Review the runner’s logs without exposing secret values.
- The screenshot is blank or misses content: Wait for an element that represents the rendered content, verify that the selector is correct, and capture after it becomes visible. A navigation event alone may occur before asynchronous page content is ready.
- The image is too short or captures the wrong area: Use full-page capture for the scrollable document or viewport capture for the visible browser area. Confirm the page’s layout and viewport are what you expect.
- Images differ across runs despite no intended change: Standardize browser and runner settings and investigate changing page content. Rendering differences can arise from the execution environment as well as the site.
- Images are missing or exposed after a successful run: Check the runner’s artifact retention and access controls. Treat screenshots of protected pages as sensitive outputs, not as harmless logs.
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Frequently Asked Questions
Can I schedule screenshots of a password-protected page automatically?
Yes. For HTTP Basic Authentication, provide credentials to the Playwright browser context and have a scheduler run the script. A page with its own login form needs a different authentication flow.
Should I capture the viewport or the full page?
Use viewport capture for the visible browser area and full-page capture when you need the document’s full scrollable length.
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