Below is a table of the properties you must have as you set up the ServiceNow® Headless Browser for Automated Test Framework.

Table 1. System properties
Property nameTypeDefault valuePurpose
sn_atf.headless.browser_options string "--no-sandbox,--disable-gpu" The CLI options are passed to the browser on startup
sn_atf.headless.default_browser string Chrome Default browser used when starting up headless requests
sn_atf.headless.default_os string Linux Operating system of host machine
sn_atf.headless.docker_image_name string Name:tag of the Docker image on the host machine
sn_atf.headless.docker_window_seconds int 60 If the Docker container fails to start up twice in this amount of time, the service will not attempt to restart
sn_atf.headless.enabled true/false false Determines whether the instance attempts to create headless client test runners for scheduled UI test runs
sn_atf.headless.heartbeat_enabled true/false true When property is true, Docker container sends a REST API request every minute to the instance to check that the sys_atf_agent is still online, and stops the container if the record status is "offline" or the record no longer exists.
sn_atf.headless.heartbeat_uri string /api/now/atf_agent/online The URL of the heartbeat endpoint so container can verify browser is still responsive
sn_atf.headless.images_check.enabled true/false false When this property is true, the instance verifies that the requested Docker image:tag is present on the host before test execution
sn_atf.headless.login_button_id string sysverb_login The HTML ID of the login page Submit/Login button
sn_atf.headless.login_page string login.do URL of login page that the browser navigates to
sn_atf.headless.password_field_id string user_password The HTML ID of the input field for the password on the Login page
sn_atf.headless.request_timeout_sec int 200 Number of seconds that HTTP requests being sent to the Docker host have until timeout
sn_atf.headless.retry_count int 10 Number of times the instance checks for agent coming online before cancelling the test run
sn_atf.headless.runner_banner_id string test_runner_banner The ID of the element verifying that client test runner page loaded correctly
sn_atf.headless.runner_url string atf_test_runner.do?sysparm_nostack=true&sysparm_scheduled_tests_only=true&sysparm_headless=true URL of the scheduled client test runner page and its query parameters
sn_atf.headless.secret_gid string 1000 The GID of the Docker container default user
sn_atf.headless.secret_id string The ID of the Docker secret on host machine
sn_atf.headless.secret_name string Name of the Docker secret on host machine
sn_atf.headless.secret_path string /run/secrets/<secret_name> Path where Docker secret file exists: (Learn more: https://docs.docker.com/engine/swarm/secrets/#how-docker-manages-secrets)
sn_atf.headless.secret_uid string 1000 The UID of the Docker container default user
sn_atf.headless.service_clean_exclude_list string Service ID exceptions that should NOT be deleted during the instance service cleanup job. This job runs every night and deletes any services that are on the host and past their expiration time.
sn_atf.headless.service_stop_deletes true/false false On completing of a test execution, if this property is true the instance will NOT send the service delete requests thus keeping the service and containers around on the host. Useful for debugging.
sn_atf.headless.timeout_mins int 1440 Number of minutes before Docker service automatically shuts down
sn_atf.headless.user_field_id string user_name The HTML ID of the input field for the username on the Login page
sn_atf.headless.username string Username of user who logs in to the instance
sn_atf.headless.validation_id string headless_vp_validation The ID of the element confirming verification page has loaded
sn_atf.headless.validation_page string atf_headless_validation_page The URL of the validation page on the instance
sn_atf.headless.vp_has_role_id string headless_vp_has_role The ID of the element verifying that the user has correct roles
sn_atf.headless.vp_success_id string headless_vp_success The ID of the element signifying entire page loaded correctly