Investigate the HttpDownloader class in Bazel's source code to understand its current HTTP client implementation. Check if it uses Java's URLConnection or Apache HttpClient. Look for existing workarounds or patches for IPv6 support. Review comments in the issue for any hints or suggestions from maintainers. Test with an IPv6 only network to reproduce the issue.
HttpDownloader fails to download on IPv6 network · bazelbuild/bazel#2486 | Good First Issue