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When a Laravel Dusk test fails only with Chrome headless, the --headless flag is rarely the first thing to blame. Check the browser and ChromeDriver versions, driver permissions and startup, the WebDriver endpoint, the test application’s availability and APP_URL, and the viewport used by the test. Headless Chrome has no visible window and does not need a display server; adding flags such as --disable-gpu or --no-sandbox without evidence can hide the real problem rather than fix it.
Start by identifying what failed
“Headless failure” can describe several different breakpoints. A browser may never start; ChromeDriver may not accept a session; the browser may start but fail to load the Laravel application; or the page may load while a visual assertion behaves differently from a headed run. Those symptoms point to different checks. Diagnose the first failing boundary rather than changing Chrome flags all at once.
- Driver or session startup fails: check Chrome/ChromeDriver compatibility, executable permissions, whether the driver started, and whether Dusk can reach its WebDriver endpoint.
- The browser starts but the app does not load: check that the application server is running and that
APP_URLresolves to that server. - The app loads but a layout or screenshot assertion differs: compare viewport size and run headed and headless with otherwise equivalent settings.
- The failure is intermittent in CI: check process startup order and readiness before treating it as a rendering issue.
This order matters: a refused connection to ChromeDriver is not evidence that a page rendered incorrectly, and a page-load failure is not necessarily evidence that Chrome itself is broken.
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Check Chrome and ChromeDriver compatibility first
Laravel Dusk uses Google Chrome with a standalone ChromeDriver by default. The installed driver needs to be compatible with the installed Chrome or Chromium browser. A mismatch can prevent a WebDriver session from being created, which may look like a headless-mode failure even though the browser has not reached the point of rendering your page.
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- From the Laravel project directory, run
php artisan dusk:chrome-driver --detect. - Confirm that the detected or installed ChromeDriver is compatible with the Chrome or Chromium version available in the environment running the tests.
- Repeat the check in CI, not only on a developer workstation. The browser installed on the CI host may differ from the local browser.
If the test passes locally but fails in CI, compare the actual browser and driver versions in both places. Do not assume that a working local Dusk installation proves the CI installation has a matching pair.
Verify the driver can execute and accept connections
Check executable permissions
Dusk needs executable ChromeDriver binaries. Laravel documents this permissions command:
chmod -R 0755 vendor/laravel/dusk/bin/
Use it where the test environment has lost the executable bit—for example, after a checkout or dependency installation that leaves the driver binary non-executable. Then retry Dusk and inspect the first driver-startup error. Changing permissions will not repair a version mismatch or an application URL that points to the wrong place.
Interpret a refused connection to port 9515
A connection refused at localhost:9515 means the WebDriver endpoint was not reachable when Dusk tried to create the browser session. The useful questions are whether ChromeDriver started, whether it could execute, whether it is listening on the expected port, and whether its version is compatible with the browser. The message alone does not establish which of those is wrong.
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- Check the driver binary’s permissions and compatibility.
- Check whether another process or a failed prior run has affected the expected port.
- Confirm that ChromeDriver is actually listening when Dusk attempts to connect.
- Check whether the driver and Dusk are configured to use the same endpoint.
Dusk normally uses port 9515. If you choose to start ChromeDriver manually, comment out static::startChromeDriver() so Dusk does not also try to start its own driver, and configure the matching RemoteWebDriver URL for the manually started process. Avoid running both startup paths at once: duplicate or mismatched driver management makes connection errors harder to diagnose.
Make sure the Laravel application is reachable
A running browser and driver do not guarantee that the test application is available. In CI, start the application server before running php artisan dusk, and set APP_URL to the address served by that process. A commonly used CI address is http://127.0.0.1:8000, but it is correct only if the server is actually listening there.
- Start the Laravel application server as a background process in the test job.
- Set
APP_URLto the server’s reachable address, such ashttp://127.0.0.1:8000when that is where the job serves the app. - Start ChromeDriver if your setup manages it manually; otherwise let Dusk start it through its normal path.
- Wait until the required processes are ready, then run
php artisan dusk.
The key is ordering and reachability, not merely issuing all the commands in one job. If Dusk starts while the server or driver is still coming up, the test can fail before either service is ready. A correct APP_URL also needs to resolve from the process running Chrome; a URL that works in a developer’s browser is not proof that it is reachable in the CI environment.
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Headless Chrome has no visible browser window. Chrome’s documentation says a display server such as Xvfb is no longer needed for headless Chrome. Therefore, installing a virtual display should not be the default response to a headless-only failure.
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For responsive-layout or screenshot-sensitive assertions, set a fixed window size. A test that depends on the available viewport can encounter a different layout when the browser’s dimensions differ between local and CI runs. When investigating, compare headed and headless executions using the same browser and driver versions, application URL, viewport, and process setup. Change one condition at a time so the comparison can reveal which difference matters.
Also distinguish a timing problem from a layout problem. If the application or driver is not ready when the test begins, changing viewport dimensions will not fix it. First establish that the same page loads reliably in both modes; then investigate visual differences at a deterministic size.
Do not add Chrome flags as a universal remedy
--disable-gpu is documented by Chrome as a temporary workaround for particular bugs, not a general requirement for headless runs. Add or remove it only as a targeted experiment tied to a reproducible Chrome issue. Record the browser version and the exact behavior that changes, then remove the flag if it does not address that behavior.
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The same diagnostic caution applies to --no-sandbox: the available evidence does not establish it as a universal fix for Dusk headless failures. Do not treat either flag as a substitute for compatible binaries, valid permissions, a reachable driver, or a live test application. Broad flag changes can make a CI job behave differently without showing which underlying failure was corrected.
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Use a controlled comparison when local passes and CI fails
Compare the environments along these axes before changing the test itself:
| What differs | What to establish | Why it matters |
|---|---|---|
| Headed versus headless | Whether the same test, app URL, browser/driver pair, and viewport fail only in headless mode | Separates a mode-specific rendering or timing difference from setup failures shared by both modes. |
| Local host versus CI host | Installed browser and driver, permissions, available ports, and startup sequence | CI may not have the same browser, executable bits, or process readiness as a workstation. |
| Chrome versus ChromeDriver | The installed versions and whether the driver is compatible with the browser | An incompatible pair can fail before a browser session exists. |
| Automatic versus manual driver startup | Whether Dusk or the job starts the driver, and whether both use the same endpoint | Conflicting startup paths can leave Dusk connecting to an unavailable endpoint. |
| Viewport | The explicit window size used for each run | Responsive and screenshot-sensitive assertions can depend on browser dimensions. |
| Application URL and timing | Whether the server is live at APP_URL before Dusk starts |
A valid URL is insufficient if the server is not yet accepting requests. |
Keep a short record of the conditions for each run: browser and driver versions, mode, viewport, driver startup method, application URL, and which process was not reachable if startup failed. This makes a “works locally” comparison actionable rather than a guess about headless Chrome.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot by symptom
Dusk cannot create a Chrome session
Run php artisan dusk:chrome-driver --detect, check browser/driver compatibility, and confirm that the driver binary is executable. If the message is a refusal at localhost:9515, verify the endpoint is listening at session-creation time and that the active startup method and configured URL agree.
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CI reports a refused connection
Inspect the job’s process order. Start the server and driver before php artisan dusk and wait until they are ready. Check that the expected port is reachable and that Dusk has not been configured to connect to a different manually managed endpoint.
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The browser opens but cannot reach the application
Check that the application process is running and that APP_URL names the address it serves. In CI, http://127.0.0.1:8000 is a common value only when the server is bound and serving there.
Only visual assertions fail
Set a fixed window size and compare headed and headless results with the same viewport and browser/driver versions. This helps distinguish a responsive-layout difference from a failed browser startup or a page that never loaded.
Adding --disable-gpu appears to help
Treat that as a lead to reproduce and tie to a particular Chrome bug, not as proof that headless mode universally needs the flag. Retest with the flag changed in isolation and retain it only if it reliably addresses the identified issue.
Or skip the browser setup
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