forward url with traefik v2 using docker - docker

Question

I want to forward url with traefik(version 2) like If I hit URL http://localhost/1 then it is forwarded to http://localhost:8081/1.
I have tried with several configuration but no one works. Please find below configuration I have done but it didn't worked.
version: "3.3"
services:
traefik:
image: "traefik:v2.0.0-rc3"
container_name: "traefik"
command:
- "--log.level=DEBUG"
- "--api.insecure=true"
- "--providers.docker=true"
- "--providers.docker.exposedbydefault=false"
- "--entrypoints.web.address=:80"
ports:
- "80:80"
- "8080:8080"
- "8081:8081"
volumes:
- "/var/run/docker.sock:/var/run/docker.sock:ro"
whoami:
#image: "containous/whoami"
#container_name: "simple-service"
#command:
# - "--port=8081"
labels:
- "traefik.enable=true"
- "traefik.http.routers.whoami.rule=Host(`localhost`)"
- "traefik.http.routers.whoami.entrypoints=web"
- "traefik.http.services.whoami.loadbalancer.server.port=8081"

Answer 1

I think you don't need to forward, since you have defined the loadbalancer port, add PathPrefix to your whoami routers rule should work.
Like this
- "traefik.http.routers.whoami.rule=Host(`localhost`) && PathPrefix(`/1`)"
And if you do need forward requests, you can use middlewares.redirectregex.
- "traefik.http.routers.whoami.middlewares=whoami-redirectregex"
- "traefik.http.middlewares.whoami-redirectregex.redirectregex.regex=^http://localhost/(.*)"
- "traefik.http.middlewares.whoami-redirectregex.redirectregex.replacement=http://localhost:8081/$${1}"
FYI. middleware docs