docker context use/build proxy not work, due the "docker.example.com" hard code!

まず、docker context create、docker context use、docker context ls、docker build . を使い、http://docker.example.com 以外のプロキシキーを指定して動作を再現します。Docker CLI のコンテキストとプロキシの処理を追跡し、ハードコードされたエンドポイントを特定します。アクティブなコンテキストの実際のエンドポイントにプロキシ設定が適用され、その動作が適切なテストでカバーされれば完了です。

Description

spark@MacBook-Pro ~ % docker context ls
NAME DESCRIPTION DOCKER ENDPOINT ERROR
remotesrv * ssh://user1@xxxxxxx.com

spark@MacBook-Pro ~ % cat ~/.docker/config.json
{
"proxies": {
"http://docker.example.com": { <<=== only "http://docker.example.com" working!!!!
"httpProxy": "http://172.17.0.1:10800",
"httpsProxy": "http://172.17.0.1:10800",
"noProxy": "localhost,127.0.0.1"
}
},
"currentContext": "alisrv"
}

{
"proxies": {
"any others will not work!!!!!": {

long time, the bug is there!

Reproduce

docker context create / use
docker context ls
docker build .

Expected behavior

No response

docker version

Client:
 Version:           29.4.0
 API version:       1.54
 Go version:        go1.25.5
 Git commit:        9d7ad9f
 Built:             unknown-buildtime
 OS/Arch:           darwin/arm64
 Context:           alisrv

Server: Docker Engine - Community
 Engine:
  Version:          29.5.0
  API version:      1.54 (minimum version 1.40)
  Go version:       go1.26.3
  Git commit:       ff8d90a
  Built:            Thu May 14 14:40:34 2026
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          v2.2.3
  GitCommit:        77c84241c7cbdd9b4eca2591793e3d4f4317c590
 runc:
  Version:          1.3.5
  GitCommit:        v1.3.5-0-g488fc13e
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

docker info

Client:
 Version:    29.4.0
 Context:    alisrv
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.33.0
    Path:     /Users/spark/.docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v5.1.2
    Path:     /Users/spark/.docker/cli-plugins/docker-compose

Server:
 Containers: 6
  Running: 2
  Paused: 0
  Stopped: 4
 Images: 8
 Server Version: 29.5.0
 Storage Driver: overlayfs
  driver-type: io.containerd.snapshotter.v1
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 CDI spec directories:
  /etc/cdi
  /var/run/cdi
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 77c84241c7cbdd9b4eca2591793e3d4f4317c590
 runc version: v1.3.5-0-g488fc13e
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.12.88+deb13-amd64
 Operating System: Debian GNU/Linux 13 (trixie)
 OSType: linux
 Architecture: x86_64
 CPUs: 2
 Total Memory: 1.848GiB
 Name: alisrv
 ID: 743bebd6-450a-4011-983c-f5218f627cc0
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 HTTP Proxy: http://172.17.0.1:10800
 HTTPS Proxy: http://172.17.0.1:10800
 No Proxy: localhost,127.0.0.1
 Experimental: false
 Insecure Registries:
  ::1/128
  127.0.0.0/8
 Live Restore Enabled: false
 Firewall Backend: iptables
  EnableUserlandProxy: true
  UserlandProxyPath: /usr/bin/docker-proxy

Additional Info

No response