kubernetes/staging/src/k8s.io/client-go/transport/spdy/spdy.go

type Upgrader …

// RoundTripperFor returns a round tripper and upgrader to use with SPDY.
func RoundTripperFor(config *restclient.Config) (http.RoundTripper, Upgrader, error) { … }

type dialer …

var _ …

// NewDialer will create a dialer that connects to the provided URL and upgrades the connection to SPDY.
func NewDialer(upgrader Upgrader, client *http.Client, method string, url *url.URL) httpstream.Dialer { … }

func (d *dialer) Dial(protocols ...string) (httpstream.Connection, string, error) { … }

// Negotiate opens a connection to a remote server and attempts to negotiate
// a SPDY connection. Upon success, it returns the connection and the protocol selected by
// the server. The client transport must use the upgradeRoundTripper - see RoundTripperFor.
func Negotiate(upgrader Upgrader, client *http.Client, req *http.Request, protocols ...string) (httpstream.Connection, string, error) { … }