buildx: ERROR: http: invalid Host header

[paralin]

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I've found a bug and checked that ...

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• ... there are no open or closed issues that are related to my problem

Description

Recently Go was updated to check the Host header more carefully.

Docker was updated to fix this by setting the Host header correctly in the client: moby/moby#45942

This fix has not yet made it into buildx. Even if buildx itself is updated, the buildkit container that it uses is the older version.

If the Docker daemon has been built with go 1.20.6, "docker build ." with a very simple dockerfile fails with ERROR: http: invalid Host header

I suggest backporting the fix for this (in the docker client) to buildx and releasing an updated buildkit docker image.

Expected behaviour

docker build . should work correctly with a Docker daemon built with go1.20.6 or newer.

Actual behaviour

The build fails with ERROR: http: invalid Host header

Buildx version

github.com/docker/buildx 6942118 6942118

Docker info

Client:
 Version:    24.0.4
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  69421182cac77598aa6bba886f5241d71e57f00a
    Path:     /usr/lib/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  2.20.0
    Path:     /usr/lib/docker/cli-plugins/docker-compose

Server:
 Containers: 6
  Running: 3
  Paused: 0
  Stopped: 3
 Images: 43
 Server Version: 24.0.4
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: journald
 Cgroup Driver: systemd
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 
 runc version: 
 init version: 
 Security Options:
  seccomp
   Profile: builtin
 Kernel Version: 6.1.36-v8
 Operating System: SkiffOS 2023.05-61-g4bf2b080
 OSType: linux
 Architecture: aarch64
 CPUs: 4
 Total Memory: 3.705GiB
 Name: pi4-3
 ID: 694c133b-2f6e-4f4d-9d7e-11a5d4d22f42
 Docker Root Dir: /mnt/persist/skiff/docker
 Debug Mode: false
 Experimental: true
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

Builders list

NAME/NODE DRIVER/ENDPOINT  STATUS BUILDKIT PLATFORMS
default * docker-container                 
  default default          error

Configuration

FROM alpine:edge

RUN apk add nano

Build logs

No response

Additional info

No response