IngressRoute to match anything not working

[maxingress]

I have been attempting to make an IngressRoute match anything.

This is not working:

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: direct-rpc
spec:
  entryPoints:
    - {{ .Values.rpcEntryPoint }}
  routes:
    - match: "HostRegexp(`{.*}`)"
      kind: Rule
      services:
        - name: myservice
          port: rpc

The above only seems to work if no host header is set. When I set one it doesn't match and I get 404.

Tests:

# works: 
curl localhost:28138

# doesn't work:
curl --header 'Host: example.com' localhost:28138

I have resorted to this:

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: direct-rpc
spec:
  entryPoints:
    - {{ .Values.rpcEntryPoint }}
  routes:
    - match: "!HostRegexp(`ahost.thatdoesnot.exist.never`)"
      kind: Rule
      services:
        - name: myservice
          port: rpc

What did you see instead?

404 page not found

What version of Traefik are you using?

v2.10.4

What is your environment & configuration?

ports:
  rpc:
    port: 28100
    expose: true
    exposedPort: 28100
    protocol: TCP
logs:
  general:
    level: DEBUG
  access:
    enabled: true

Just standard helm install on K8s cluster with the above values file

If applicable, please paste the log output in DEBUG level

Debug logs just show 404s

192.168.65.4 - - [20/Sep/2023:14:40:37 +0000] "POST / HTTP/1.1" 404 76 "-" "-" 7780 "direct-rp 73234b1b1e8726bbbb2c@kubernetescrd" "http://10.1.3.181:183" 0ms

Is this a bug? I would have expected the regex to match anything. Many thanks.

[ldez]

hello,

the syntax of the rule must be HostRegexp(`{host:.*}`)

Regexp Syntax

HostRegexp, PathPrefix, and Path accept an expression with zero or more groups enclosed by curly braces, which are called named regexps. Named regexps, of the form {name:regexp}, are the only expressions considered for regexp matching. The regexp name (name in the above example) is an arbitrary value, that exists only for historical reasons.

Traefik Routers Documentation - Traefik

[maxingress]

@ldez

{host:.*}

Thanks @ldez, I had already tried naming the regex match but that doesn't work at all. Now both the curl tests return 404.

[ldez]

The rule works, maybe you have another problem not related to the rule.
Maybe it's your endpoint, your network, etc.

[maxingress]

I'm only changing the match rule and it goes from working to not working. Doesn't that rule out it being a problem elsewhere?

I'll try and make a minimum reproducible set up.

[maxingress]

Time for the embarrassed apology!

I had a ! not left over from previous experiments.

Many thanks @ldez for staying patient with me and for fixing my problem. It did indeed just need the regex match naming.

The old programming lesson I never seem to learn, when you think it's a bug in the tool, it's probably not.