Stripprefix middleware not working as expected

Traefik Traefik v3 (latest)
,
1

Hello, I'm trying to replace caddy with traefik as my main reverse-proxy.
But I'm unable to do a simple PathPrefix / StripPrefix combination like i do in caddy with handle_path (https://caddyserver.com/docs/caddyfile/directives/handle_path)

My compose.yml

services:
  traefik:
    image: traefik:v3.1
    command:
      - --api.insecure=true
      - --providers.docker
      - --log.level=DEBUG
    ports:
      - "80:80"
      - "8080:8080"
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock

  echo:
    image: mendhak/http-https-echo
    labels:
      traefik.http.routers.echo.rule: Host("localhost")

  echo-api:
    image: mendhak/http-https-echo
    labels:
      traefik.http.routers.echo-api.rule: Host("localhost") && PathPrefix("/api")
      traefik.http.routers.echo-api.middlewares": "strip-api"
      traefik.http.middlewares.strip-api.stripprefix.prefixes": "/api"

  echo-auth:
    image: mendhak/http-https-echo
    labels:
      traefik.http.routers.echo-auth.rule: Host("localhost") && PathPrefix("/auth")

Now if i do a curl http://localhost/auth/123 the request is routed to the echo-auth container, so far so good. But the request that the auth container sees has the /auth prefix still attached.

Now i want to remove this prefix for the echo-api container, but as soon as i do this, the requests are no longer routed to the echo-api container, instead they are catched by the echo container.

This is not what I'm expecting from this config, compare this caddy compose:

services:
  caddy:
    image: caddy:2
    ports:
      - "80:80"
    volumes:
      - "./Caddyfile:/etc/caddy/Caddyfile"
  echo:
    image: mendhak/http-https-echo
  echo-api:
    image: mendhak/http-https-echo
  echo-auth:
    image: mendhak/http-https-echo

With the following Caddyfile:

:80 {
	handle /auth* {
		reverse_proxy echo-auth:8080
	}

	handle_path /api* {
		reverse_proxy echo-api:8080
	}

	reverse_proxy echo:8080
}

Here the handle_path directive is stripping the /api prefix and routes the requests to the echo-api container and not to the echo container.

Can you please help me with this problem, as this is an essential config for a client/server deployment with traefik.

Regards

2

But echo-auth doesn’t have a stripprefix middleware attached.

3

Hi, yes i have the /auth container as a control group here, This container does not have its prefix stripped.
Also in the caddy example the prefix is not stripped as i use handle and not handle_path.

If you test both compose deployments and test them side-by-side you'll see they are the same for /auth (Prefix is not stripped)
But they differ for /api.
With caddy the /api prefix will get stripped correctly, but with traefik it will route to the echo container instead

4

I'll add the results of the caddy vs traefik tests, so you don't have to spin up the example:

caddy

curl localhost -> echo -> "/"
curl localhost/auth/test -> echo-auth -> "/auth/test"
curl localhost/api/test -> echo-api -> "/test"

traefik

curl localhost -> echo -> "/"
curl localhost/auth/test -> echo-auth -> "/auth/test"
curl localhost/api/test -> echo -> "/api/test" < This is unexpected
5

Maybe you need to fix your "s.

From the doc:

# Strip prefix /foobar and /fiibar
labels:
  - "traefik.http.middlewares.test-stripprefix.stripprefix.prefixes=/foobar,/fiibar"
6

I changed it to:

echo-api:
  image: mendhak/http-https-echo
  labels:
    - "traefik.http.routers.echo-api.rule=Host(`localhost`) && PathPrefix(`/api`)"
    - "traefik.http.routers.echo-api.middlewares=`strip-api`"
    - "traefik.http.middlewares.strip-api.stripprefix.prefixes=/api"

But getting the same results.
I think its an internal route ordering issue

7

Why backticks in there?

Enable Traefik dashboard and Traefik debug log to check if your config is correctly recognized by Traefik.