Onlyoffice not work in version 2

[Maurotb]

Bug

Using Onlyoffice with any version of traefik > 2.0
seem to work but when i open document nextcloud hung in "loading document"

With version < 2.0 , work correctly

  - traefik.http.routers.onlyoffice_xxx_it-https.rule=Host(`test.test.it`)
  - traefik.http.routers.onlyoffice_xxx_it-https.EntryPoints=https
  - traefik.http.routers.onlyoffice_xxx_it-https.tls.certresolver=letsencrypt-http
  - traefik.http.routers.onlyoffice_xxx_it-https.tls.options=

traefik.yml

entryPoints:
http:
address: ":80"

https:
address: ":443"

certificatesResolvers:
letsencrypt-http:
acme:
email: postmaster@test.it
storage: acme.json
httpChallenge:
entryPoint: http

Docker configuration backend

providers:
docker:
endpoint: "unix:///var/run/docker.sock"
exposedByDefault: false

API and dashboard configuration

api:
dashboard: true
insecure: true

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