[Bug]: Kernel download honors `HTTP_PROXY` but not other standard environment variables.

[SuzukiHonoka]

I have done the following

• I have searched the existing issues
• If possible, I've reproduced the issue using the 'main' branch of this project

Steps to reproduce

Set proxy envirment by use following vars:

• http_proxy
• https_proxy

Start the container system.

Current behavior

It does not use the proxy settings in the environment.

Expected behavior

Use proxy settings in environment.

Environment

- OS: 15.6
- Xcode: 16.4
- Container: container CLI version 0.3.0 (build: release, commit: 3fcf647)

Relevant log output

#printenv|grep proxy
http_proxy=http://127.0.0.1:10828
https_proxy=http://127.0.0.1:10828

#container s start
Verifying apiserver is running...
No default kernel configured.
Install the recommended default kernel from [https://github.com/kata-containers/kata-containers/releases/download/3.17.0/kata-static-3.17.0-arm64.tar.xz]? [Y/n]: y
Installing kernel...
Error: unknown: "StreamClosed(streamID: HTTP2StreamID(1), errorCode: HTTP2ErrorCode<0x1 ProtocolError>, location: "NIOHTTP2/HTTP2StreamChannel.swift:892")"

Code of Conduct

• I agree to follow this project's Code of Conduct

[jglogan]

@SuzukiHonoka Good catch! This turns out to be a containerization issue, but in container the same limitation exists for kernel download.

I filed apple/containerization#266 for the issue that you reported here; we can use this one for kernel download.

These should be easy fixes. Best would be to implement a pubic utility function down in Containerization to create the appropriate HttpProxy? based on URL and the standard environment variables (both upper and lower case), and then use that for both image fetch and kernel download.

Consider filing PRs!

[SuzukiHonoka]

Thanks, I tested the 'HTTP_PROXY', but it does not work too, I don't see the traffic for downloding kernel at all.
Environment check:

# printenv|grep PROXY
HTTP_PROXY=http://127.0.0.1:10828
HTTPS_PROXY=http://127.0.0.1:10828