Existing-session
Reuse real signed-in state
Best when the real browser session on the host matters.
Use this page when the browser starts but preview navigation still fails, or when the real browser lives on another machine.
If basic browser health works but a preview still does not open, the problem is usually reachability, SSRF policy, hostname choice, or the wrong routing model rather than browser launch itself.
Best when the real browser session on the host matters.
Best when the browser actually lives on another machine.
Best when an explicit DevTools endpoint is part of the design.
Classify whether the problem is really launch, reachability, or profile-state.
Fix logged-out-looking browser behavior without chasing the wrong layer.