@@ -114,14 +114,12 @@ func notifyShutdown(err error) {

 }

 func wrapListeners(proto string, ls []net.Listener) []net.Listener {

-	if os.Getenv("DOCKER_HTTP_HOST_COMPAT") != "" {

-		switch proto {

-		case "unix":

-			ls[0] = &hack.MalformedHostHeaderOverride{ls[0]}

-		case "fd":

-			for i := range ls {

-				ls[i] = &hack.MalformedHostHeaderOverride{ls[i]}

-			}

+	switch proto {

+	case "unix":

+		ls[0] = &hack.MalformedHostHeaderOverride{ls[0]}

+	case "fd":

+		for i := range ls {

+			ls[i] = &hack.MalformedHostHeaderOverride{ls[i]}

 		}

 	}

 	return ls

@@ -850,20 +850,6 @@ set like this:

     export DOCKER_TMPDIR=/mnt/disk2/tmp

     /usr/local/bin/dockerd -D -g /var/lib/docker -H unix:// > /var/lib/docker-machine/docker.log 2>&1

-Docker clients <= 1.9.2 used an invalid Host header when making request to the

-daemon. Docker 1.12 is built using golang 1.6 which is now checking the validity

-of the Host header and as such clients <= 1.9.2 can't talk anymore to the daemon.

-Docker supports overcoming this issue via a Docker daemon

-environment variable. In case you are seeing this error when contacting the

-daemon:

-

-    Error response from daemon: 400 Bad Request: malformed Host header

-

-The `DOCKER_HTTP_HOST_COMPAT` can be set like this:

-

-    DOCKER_HTTP_HOST_COMPAT=1 /usr/local/bin/dockerd ...

-

-

 ## Default cgroup parent

 The `--cgroup-parent` option allows you to set the default cgroup parent