File backend doesn't work with local host url

[poVoq]

Do you want to request a feature or report a bug?

Bug

What did you do?

Install Traefik 1.6rc6 trough the dockerhub provided image. The configure a file-backend for the BOSH etc. web url of my ejabberd server running on the host system besides some docker images.

What did you expect to see?

Reverse proxying requests to a internal port 5280 through the file backend via "localhost:5280" or "127.0.0.1:5280" without opening the port 5280 in my firewall.

What did you see instead?

url "localhost:5280" or "127.0.0.1:5280" (with or without open port) result in a 502 bad gateway server response, while directly accessing the ejabberd through an open port works and also putting the actual IP of the server in the file backend and keeping the port open works as well.

Output of traefik version: (What version of Traefik are you using?)

1.6rc6 Docker image from dockerhub

Thanks for the help.

[traefiker]

Hi! I'm Træfiker 🤖 the bot in charge of communication regulation.

Thanks for your interest in Træfik!

We dedicate the issue tracker to bug reports and feature requests only.

If you have questions and need community support, you can join our Slack workspace and reach out to us on the #support channel.

Another option is to use Stack Overflow and tag your question traefik.

Of course, double checking Træfik's documentation is always a good idea 😅