Redirect to subpath and http to https

Traefik Traefik v2
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4

First if you are redirecting everything on your web entry point to https may I suggest EntryPoint Redirection and entrypoint TLS (Traefik v2.2). It saves a catchall rule or a rule and middleware per service. I find it a lot cleaner to work with.

I would go about it like:

# This would _only_ match http://app.url.com
traefik.http.routers.app-websecure-redir.rule: Host(`app.url.com`) && Path(`/`)
traefik.http.routers.app-websecure-redir.tls: true
traefik.http.routers.app-websecure-redir.middlewares: app-websecure-redir
traefik.http.middlewares.app-websecure-redir.redirectregex.regex: ".*"
traefik.http.middlewares.app-websecure-redir.redirectregex.replacement: https://app.url.com/subpath/
...
# Your router is here
traefik.http.routers.app-websecure.rule: Host(`app.url.com`) && PathPrefix(`/subpath/`)
...
...

I hope this helps, if there is anything more complex like redirecting anything that does NOT have /subpath/ or requires passing the original path to subpath then the redirectregex can be updated.

As I got to the end of this I thought if your app returns the correct path on the request you could just do an addPrefix.

# This would _only_ match http://app.url.com/
traefik.http.routers.app-websecure-redir.rule: Host(`app.url.com`) && Path(`/`)
traefik.http.routers.app-websecure-redir.tls: true
traefik.http.routers.app-websecure-redir.middlewares: app-websecure-addsub
traefik.http.middlewares.app-websecure-addsub.addPrefix.prefix: /subpath
...
# Your router is here
traefik.http.routers.app-websecure.rule: Host(`app.url.com`) && PathPrefix(`/subpath/`)
...
...
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