Dashboard web root no longer redirects to /rollouts

[gdvalle]

Describe the bug
v1.3.0 introduced a behavioral change where the Dashboard UI no longer redirects on the root to /rollouts, and instead displays a 404 not found.

That change seems to have happened here, in the PR to introduce --root-path flag.

To Reproduce

Run argo dashboard on v1.2.2, hit http://<dashboard>, receive a client-side JS redirect to /rollouts.
Run argo dashboard on v1.3.0, hit http://<dashboard>, receive 404 not found from the server.

Expected behavior

Hit http://<dashboard>, receive a client-side JS redirect to /<root-path> if root-path is not on the root. If on the root, no redirection occurs.
OR, have the server itself return a 301/302 to /<root-path>, so there's no javascript requirement.

Version
1.3.0

Logs

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[gdvalle]

Thanks, @leoluz!