func NewResponseUpgrader() httpstream.ResponseUpgrader {
	return responseUpgrader{}
}
NewResponseUpgrader returns a new httpstream.ResponseUpgrader that is
capable of upgrading HTTP responses using SPDY/3.1 via the
spdystream package.
package spdy
import (
	"fmt"
	"net/http"
	"strings"
	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/httpstream"
	"github.com/golang/glog"
)
const HeaderSpdy31 = "SPDY/3.1"
type responseUpgrader struct {
}