Make client underlying HTTP client accessible

Signed-off-by: Mathieu Champlon <mathieu.champlon@docker.com>
Upstream-commit: 5a84124739a809bcdb5830fd385440027ddd910f
Component: engine

components/engine/client/client.go

@@ -356,6 +356,11 @@ func (cli *Client) DaemonHost() string {
 	return cli.host
 }
 
+// HTTPClient returns a copy of the HTTP client bound to the server
+func (cli *Client) HTTPClient() *http.Client {
+	return &*cli.client
+}
+
 // ParseHostURL parses a url string, validates the string is a host url, and
 // returns the parsed URL
 func ParseHostURL(host string) (*url.URL, error) {

components/engine/client/interface.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"io"
 	"net"
+	"net/http"
 	"time"
 
 	"github.com/docker/docker/api/types"
@@ -33,6 +34,7 @@ type CommonAPIClient interface {
 	VolumeAPIClient
 	ClientVersion() string
 	DaemonHost() string
+	HTTPClient() *http.Client
 	ServerVersion(ctx context.Context) (types.Version, error)
 	NegotiateAPIVersion(ctx context.Context)
 	NegotiateAPIVersionPing(types.Ping)