Traefik redirections - traefik

Question

I'm trying to implement a basic redirection in Traefik's file provider. I would
like the following:
http://example.com/foobar -> https://foobar.example.com
http://www.example.com/foobar -> https://foobar.example.com
https://example.com/foobar -> https://foobar.example.com
https://www.example.com/foobar -> https://foobar.example.com
Here's my attempt:
http:
middlewares:
redirect-foobar:
redirectRegex:
permanent: true
regex: "^https?://(www\\.)?example\\.com/foobar(/?.*)"
replacement: "https://foobar.example.com${2}"
routers:
catch-foobar:
middlewares:
- redirect-foobar
rule: Host(`example.com`) || Host(`www.example.com`)
service: noop#internal
But when I try it out, here's what I get:
$ curl -I http://www.example.com/foobar
HTTP/1.1 308 Permanent Redirect
Location: https://foobar.example.com
Date: Wed, 02 Mar 2022 02:12:48 GMT
Content-Length: 18
Content-Type: text/plain; charset=utf-8
# That's good =)
$ curl -I https://www.example.com/foobar
HTTP/2 404
content-type: text/plain; charset=utf-8
x-content-type-options: nosniff
content-length: 19
date: Wed, 02 Mar 2022 02:05:22 GMT
# Does that mean the request didn't even make it to the catch-foobar router?
What am I doing wrong? Any help would be greatly appreciated.
Thanks,
C
edit: fixed the regex, but the https case is still problematic

Answer 1

The folks from the Traefik community forum helped me. It turned out the router did not have a tls configuration. The correct configuration looks like this:
http:
middlewares:
redirect-foobar:
redirectRegex:
permanent: true
regex: "^https?://(www\\.)?example\\.com/foobar(/?.*)"
replacement: "https://foobar.example.com${2}"
routers:
catch-foobar:
middlewares:
- redirect-foobar
rule: Host(`example.com`) || Host(`www.example.com`)
service: noop#internal
tls: # here
certResolver: default
where default is a certificate resolver defined in my traefik.yml.