Nexus behind traefik with path answer 404

Traefik Traefik v2
,
1

Hi,

I try to configure nexus behind traefik by file but nexus answer by 404 and assets are from root of domain.
Do I have to force middleware with some headers ?
How traefik will give the good path to nexus ?
Nothing seems to have the corresponding header https://help.sonatype.com/repomanager3/installation/run-behind-a-reverse-proxy

traefik.toml

[entryPoints]
  [entryPoints.web]
    address = ":80"
[providers]
  [providers.file]
    filename = "/etc/traefik/dynamic.toml"
    watch = true

[api]
  insecure = true
  dashboard = true
  debug = true

[log]
  filePath = "/log/traefik.log"
  level = "INFO"

[accessLog]
  filePath = "/log/access.log"

dynamic.toml

[http.routers]
  [http.routers.nexus]
    entryPoints = ["web"]
    rule = "PathPrefix(`/nexus`)"
    service = "nexus"

[http.services]
  [http.services.nexus.loadBalancer]
    [[http.services.nexus.loadBalancer.servers]]
      url = "http://team-server_nexus_1:8081"

docker-compose.yml

version: '3'

services:
  reverse-proxy:
    image: traefik:v2.0
    ports:
      - "80:80"
    volumes:
      - './traefik:/etc/traefik'
      - '/srv/traefik/log:/log'

  nexus:
    image: 'sonatype/nexus3'
    volumes:
      - '/srv/nexus/data:/nexus-data'

and i have some traces in logfile telling that dynamic.toml is not found each time I change it and the configuration is well changed (i see it in traefik dashboard but i don't let it active all time)

thanks