Docker does not download images via proxy

[altxt]

Version

0.6.1

What steps are needed to reproduce the behavior?

I try to run docker in a network where Internet is only accessible via proxy. Docker, however, seems to ignore the proxy and tries to connect directly, which is not possible in this environment. So it fails with a timeout. I am running all of the following commands inside wsl -d stevedore, even though eventually I need this to work from Windows.

What you expected?

An image is downloaded successfully from docker hub.

What happened?

hostname:~# docker pull nginx
Using default tag: latest
Error response from daemon: Get "https://registry-1.docker.io/v2/": dial tcp 52.200.78.26:443: i/o timeout

or

hostname:~# docker pull nginx
Using default tag: latest
Error response from daemon: Get "https://registry-1.docker.io/v2/": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)

Additional context

I have the following environment variables set

hostname:~# env | grep -i proxy
HTTPS_PROXY=http://user:[email protected]:port
HTTP_PROXY=http://user:[email protected]:port
http_proxy=http://user:[email protected]:port
https_proxy=http://user:[email protected]:port

Also, a custom root CA certificate is available in /etc/ssl/certs/

This is enought for apk and curl to work:

hostname:~# curl https://registry-1.docker.io/v2/
{"errors":[{"code":"UNAUTHORIZED","message":"authentication required","detail":null}]}