### Did you try using a 1.7.x configuration for the version 2.0?
- [ ] Yes
- [ ] No
<!--
If you just checked the "Yes" box, be aware that this is probably not a bug. The configurations between 1.X and 2.X are NOT compatible. Please have a look here https://docs.traefik.io/v2.0/getting-started/configuration-overview/.
- Explain the conditions which led you to report this issue: the context.
- The context should lead to something, an idea or a problem that you’re facing.
- Remain clear and concise.
- Format your messages to help the reader focus on what matters and understand the structure of your message, use Markdown syntax https://help.github.com/articles/github-flavored-markdown
-->
### What did you expect to see?
### What did you see instead?
### Output of `traefik version`: (_What version of Traefik are you using?_)
<!--
For the Traefik Docker image:
docker run [IMAGE] version
ex: docker run traefik version
For the alpine Traefik Docker image:
docker run [IMAGE] traefik version
ex: docker run traefik traefik version
-->
```
(paste your output here)
```
### What is your environment & configuration (arguments, toml, provider, platform, ...)?
```toml
# (paste your configuration here)
```
<!--
Add more configuration information here.
-->
### If applicable, please paste the log output in DEBUG level (`--logLevel=DEBUG` switch)