Merge pull request #1445 from dsissitka/host

* Runtime: Updated the Docker CLI to specify a value for the "Host" header.

commands.go

@@ -1540,6 +1540,7 @@ func (cli *DockerCli) call(method, path string, data interface{}) ([]byte, int,
 		return nil, -1, err
 	}
 	req.Header.Set("User-Agent", "Docker-Client/"+VERSION)
+	req.Host = cli.addr
 	if data != nil {
 		req.Header.Set("Content-Type", "application/json")
 	} else if method == "POST" {
@@ -1581,6 +1582,7 @@ func (cli *DockerCli) stream(method, path string, in io.Reader, out io.Writer) e
 		return err
 	}
 	req.Header.Set("User-Agent", "Docker-Client/"+VERSION)
+	req.Host = cli.addr
 	if method == "POST" {
 		req.Header.Set("Content-Type", "plain/text")
 	}
@@ -1628,6 +1630,7 @@ func (cli *DockerCli) hijack(method, path string, setRawTerminal bool, in io.Rea
 	}
 	req.Header.Set("User-Agent", "Docker-Client/"+VERSION)
 	req.Header.Set("Content-Type", "plain/text")
+	req.Host = cli.addr
 
 	dial, err := net.Dial(cli.proto, cli.addr)
 	if err != nil {