Caddy serves index.html instead of admin.html, or SPA don't work on non-root URLs

Help
8

Upgraded to 0.10.6.

Behaviour did not changed.

I tried three variants of rewrite directive in admin.dev.domain.net block.
Details:

1 Code:

index admin.html
rewrite {
  to {path} {path}/ /
}

Results to: admin.dev.domain.net returns always index.html instead of admin.html from this block (seen in logs).

2 Code:

index admin.html
rewrite / admin.html

Results to: admin.dev.domain.net returns admin.html for / path and 404 for other paths.

3 Code:

index admin.html
rewrite {
  to {path} {path}/ /admin.html
}

Results to: admin.dev.domain.net returns index.html for / path and admin.html for other paths.

We need: admin.dev.domain.net returns admin.html for / path and admin.html for other paths.